EN 54-22 Fire detection and fire alarm systems – Part 22: Resettable line-type heat detectors

1 Scope
This European Standard applies to resettable line-type heat detectors consisting of a sensing element using an optical fibre, a pneumatic tube or an electrical sensor cable connected to a sensor control unit, either directly or through an interface module, intended for use in fire detection and fire alarm systems installed in and around buildings and other civil engineering works (see EN 54-1:2011).
This European Standard specifies the requirements and performance criteria, the corresponding test methods and provides for the Assessment and Verification of Constancy of Performance (AVCP) of resettable line-type heat detectors to this EN.
This European Standard also covers resettable line-type heat detectors intended for use in the local protection of plant and equipment.
Resettable line-type heat detectors with special characteristics and developed for specific risks are not covered by this EN.
This European Standard does not cover line-type heat detectors that are based on non-resettable, fixed temperature electrical cables (so called “digital” systems).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 54-1:2011, Fire detection and fire alarm systems — Part 1: Introduction
EN 54-7:2000, Fire detection and fire alarm systems — Part 7: Smoke detectors — Point detectors using scattered light, transmitted light or ionization
EN 50130-4:2011, Alarm systems — Part 4: Electromagnetic compatibility — Product family standard: Immunity requirements for components of fire, intruder, hold up, CCTV, access control and social alarm systems
EN 60068-1:1994, Environmental testing — Part 1: General and guidance (IEC 60068-1:1988 + Corrigendum 1988 +A1:1992)
EN 60068-2-1:2007, Environmental testing — Part 2-1: Tests — Test A: Cold (IEC 60068-2-1:2007)
EN 60068-2-2:2007, Environmental testing — Part 2-2: Tests — Test B: Dry heat (IEC 60068-2-2:2007)
EN 60068-2-27:2009, Environmental testing — Part 2-27: Tests — Test Ea and guidance: Shock (IEC 60068¬2-27:2009)
EN 60068-2-30:2005, Environmental testing — Part 2-30: Tests — Test Db: Damp heat, cyclic (12 h + 12 h cycle) ((IEC 60068-2-30:2005)
EN 60068-2-42:2003, Environmental testing — Part 2-42: Tests — Test Kc: Sulphur dioxide test for contacts and connections ((IEC 60068-2-42:2003)
EN 60068-2-6:2008, Environmental testing — Part 2-6: Tests — Test Fc: Vibration (sinusoidal) (IEC 60068-2¬6:2008)
EN 60068-2-78:2001, Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state (IEC 60068-2-78:2001)
3 Terms, definitions and abbreviations
For the purposes of this document the terms and definitions given in EN 54-1:2011 and the following apply. 3.1 Terms and definitions
3.1.1
functional unit
part of a line-type heat detector in addition to the sensor control unit and the sensing element which is essential for the function of the line-type heat detector
EXAMPLE Terminating device, filter, switch.
3.1.2
integrating line-type heat detector
detectors for which the response to temperature is summed in some way, (not necessarily linearly), along a length of the sensing element. For such detectors, the output to the sensor control unit is therefore a function of the temperature distribution along the length of the sensing element
EXAMPLE Pneumatic systems.
3.1.3
linear line-type heat detector
detectors which respond to heat applied to any point along the length of the sensing element
3.1.4
line-type heat detector LTHD
detector which responds to heat sensed in the vicinity of a continuous line
Note 1 to entry: A line-type heat detector may consist of a sensor control unit, a sensing element and functional units.
3.1.5
local protection application
application in which the sensing element is installed in relatively close proximity to the potential fire risk
EXAMPLE pipelines, conveyor belts, combustion engines/turbines, rolling stock, transformers, process dryers, cable trays, escalators, chemical process equipment, electrical equipment cabinets, ventilation systems (dust collector, hood extractor, etc.), switch gear (e.g. printing press), etc.
3.1.6
multipoint line-type heat detector
detectors that contain multiple discrete temperature sensors, which are separated by a distance of no more than 10 m, embedded within the sensing element (see 3.1.11)
3.1.7
non-resettable line-type heat detectors NLTHD
LTHD which can only respond once
3.1.8
non-integrating line-type heat detector
detectors for which the output signal is depending on local temperature effects but not on the integration of the whole temperature distribution along the sensing element
EXAMPLE Fibre optics systems.
3.1.9
resettable line-type heat detectors RLTHD
LTHD which is able to return to its quiescent condition after a response
3.1.10
room protection application
application in which the sensing element is installed at a distance from the potential fire hazard close to the ceiling or roof of the area to be protected
EXAMPLE car parks (open or closed), road/rail/metro tunnels, floor/ceiling voids, elevator shafts, cold stores, warehouses, heritage buildings, aircrafts hangars, spray shops, chemical storehouses, ammunition depots, refineries, silos, etc.
3.1.11
sensing element
heat sensing part of the line-type heat detector which can be a fibre optic cable, a pneumatic tube or an electrical cable
Note 1 to entry: A sensing element may consist of different segments separated e.g. by functional units or splices.
3.1.12
sensor control unit
unit that supervises the sensing element and communicates to the control and indicating equipment
Note 1 to entry: The unit can be remote or an integral part of the control and indicating equipment as defined by EN 54-2.
3.2 Abbreviations
For the purposes of this document the following abbreviation apply: RLTHD resettable line-type heat detector 4 Product characteristics 4.1 General
4.1.1 Compliance
In order to comply with this standard, resettable line-type heat detectors shall meet the provisions of Clause 4, which shall be verified by visual inspection or engineering assessment as described in Clause 5 and shall meet the requirements of the tests.
4.1.2 Heat response classes
4.1.2.1 Heat response for room protection application
For room protection application the heat response of RLTHD is classified as indicated in Table 1.
4.1.2.2 Heat response for local protection application
For local protection application the heat response of the RLTHD is classified as indicated in Table 2.
4.1.3 Environmental groups
Different environmental groups are necessary to reflect the different service environment of the components of a line-type heat detector:
The sensing element is in either environmental group II or III.
The sensor control unit and the functional unit are in either environmental group I, II or III.
NOTE Environmental group I covers equipment likely to be installed indoors in commercial/industrial premises but for which the avoidance of extreme environmental conditions can be taken into account in the selection of the mounting site. Environmental group II covers equipment likely to be installed indoors in commercial/industrial premises in all general areas. Environmental group III covers equipment which is intended to be installed out of doors.
4.2 Nominal activation conditions/sensitivity
4.2.1 Individual alarm indication
Each sensor control unit shall be provided with an integral red visual indicator, by which the general alarm condition can be identified, until the alarm condition is reset. Where other conditions of the sensor control unit can be visually indicated, they shall be clearly distinguishable from the alarm indication, except when the sensor control unit is switched into a service mode. The visual indicator shall be visible from a distance of 6 m in the direct line of sight perpendicular to the surface, in an ambient light intensity up to 500 lux.
If more than one sensing element is connected to the sensor control unit, there shall be a separate alarm indication for each sensing element.
To confirm this, the detector shall be assessed in accordance with 5.2.1.
4.2.2 Signalling
The line-type heat detector shall signal the alarm and fault status to the control and indicating equipment.
If more than one sensing element is connected to a sensor control unit, there shall be separate alarm and fault signals for each sensing element.
To confirm this, the detector shall be assessed in accordance with 5.2.2.
4.2.3 Repeatability
The ratio of response times of the RLTHD shall be within the limits, even after a number of alarm conditions, as specified in 5.2.3.
4.2.4 Reproducibility
The ratio of response times of several specimens of the RLTHD shall be within the limits as specified in 5.2.4. 4.3 Operational reliability
4.3.1 Connection of ancillary devices
Where the RLTHD provides for connections to ancillary devices (e.g. remote indicators, RS 485 interface), open or short-circuit failures of these connections shall not prevent the correct operation of the RLTHD.
Where such connections are present the detector shall be assessed in accordance with 5.3.1.
4.3.2 Manufacturer’s adjustments
It shall not be possible to change the manufacturer’s settings except by special means (e.g. the use of a key, a code or a special tool or by breaking or removing a seal).
To confirm this, the detector shall be assessed in accordance with 5.3.2.
4.3.3 Requirements for software controlled detectors
4.3.3.1 General
For RLTHD, which rely on software control in order to fulfil the requirements of this standard, the requirements of 4.3.3.2, 4.3.3.3 and 4.3.3.4 shall be met.
4.3.3.2 Software documentation
4.3.3.2.1 The manufacturer shall submit documentation, which gives an overview of the software design. This documentation shall provide sufficient detail for the design to be inspected for compliance with this standard and shall include the following as a minimum:
4.3.3.2.2 The manufacturer shall have available detailed design documentation, which only needs to be provided if required by the testing laboratory. It shall comprise at least the following:
4.3.3.3 Software design
In order to ensure the reliability of the RLTHD, the following requirements for software design shall apply:
4.3.3.4 The storage of programs and data
The program necessary to comply with this standard and any preset data, such as manufacturer’s settings, shall be held in non-volatile memory. Writing to areas of memory containing this program and data shall only be possible by the use of some special tool or code and shall not be possible during normal operation of the RLTHD.
Site-specific data shall be held in memory which will retain data for at least two weeks without external power to the detector, unless provision is made for the automatic renewal of such data, following loss of power, within 1 h of power being restored.
4.3.4 Sensing element fault
The RLTHD shall generate fault conditions as specified in 5.3.4.
4.3.5 On-site adjustment of response behaviour
The effective response behaviour of a RLTHD is dependent upon both the sensitivity settings of the sensor control unit and the heat sensing element. Many types of RLTHD therefore have facilities to adjust the sensitivity of the RLTHD to suit the application.
If there is provision for on-site adjustment of the response behaviour of the detector then:
4.3.6 Maximum ambient temperature test (sensing element)
The RLTHD shall function correctly even if the sensing element is exposed to high ambient temperatures as specified in 5.3.6.
4.4 Tolerance to supply voltage
4.4.1 Variation in supply parameters
The RLTHD shall function correctly within the specified range(s) of the supply parameters as specified in 5.4.1
4.4.2 Low voltage fault
The RLTHD shall signal a fault condition when its input power supply falls below the minimum voltage specified by the manufacturer as specified in 5.4.2
4.5 Performance parameters under fire conditions
4.5.1 Fire sensitivity for room protection application
Heat response Class A1N, A1I, A2N and A2I RLTHD (for room protection application) shall have an adequate sensitivity to the heat release of a real test fire as required for general application in fire detection systems as specified in 4.1.2.1.and tested as specified in 5.5.1
4.5.2 Static response temperature test
The RLTHD shall have, depending on its classification, an adequate sensitivity to a slow rate of rise of temperature as specified in 4.1.2.2.and tested as specified in 5.5.2.
4.6 Durability of nominal activation conditions/sensitivity
4.6.1 Temperature resistance
4.6.1.1 Dry heat (operational) sensor control unit
The sensor control unit of the RLTHD shall function correctly, at high ambient temperatures as specified in 5.6.1.1.
4.6.1.2 Dry heat (endurance) for sensing element
The sensing element of the RLTHD shall be capable of withstanding long term exposure to high temperature as specified in 5.6.1.2.
4.6.1.3 Cold (operational) for sensing element
The RLTHD shall function correctly even if the sensing element is exposed to low ambient temperatures as specified in 5.6.1.3.
4.6.1.4 Cold (operational) for sensor control unit
The sensor control unit of the RLTHD shall function correctly at low ambient temperatures as specified in 5.6.1.4.
4.6.2 Humidity resistance
4.6.2.1 Damp heat, steady state (endurance) for sensor control unit and sensing element
The RLTHD shall be capable of withstanding long term exposure to a high level of continuous humidity as specified in 5.6.2.1.
4.6.2.2 Damp heat, cyclic (operational) for sensing element
The RLTHD shall function correctly even if the sensing element is exposed to a high level of humidity as specified in 5.6.2.2.
4.6.2.3 Damp heat, cyclic (operational) for sensor control
The sensor control unit of the RLTHD shall function correctly at a high level of humidity as specified in 5.6.2.3.
4.6.2.4 Damp heat, steady state (operational) for sensor control unit
The sensor control unit of the RLTHD shall function correctly at a high level of humidity as specified in 5.6.2.4.
4.6.2.5 Damp heat, cyclic (endurance) for sensor control unit and sensing element
The RLTHD shall be capable withstanding the effect of cyclic humidity levels as specified in 5.6.2.5.
4.6.3 Shock and vibration resistance
4.6.3.1 Shock (operational) for sensor control unit
4.6.3.2 Impact (operational) for sensor control unit
The sensor control unit of the RLTHD shall operate correctly when submitted to mechanical impacts as specified in 5.6.3.2.
4.6.3.3 Impact (operational) for sensing element
The RLTHD shall function correctly even if the sensing element is submitted to mechanical impacts as specified in 5.6.3.3.
4.6.3.4 Vibration, sinusoidal (operational) for sensor control unit
The sensor control unit of the RLTHD shall operate correctly when submitted to sinusoidal vibration as specified in 5.6.3.4.
4.6.3.5 Vibration, sinusoidal (operational) for sensing element
The RLTHD shall function correctly even if the sensing element is submitted to sinusoidal vibration as specified in 5.6.3.5.
4.6.3.6 Vibration, sinusoidal (endurance) for sensor control unit
The sensor control unit of the RLTHD shall be capable of withstanding the effect of sinusoidal vibration as specified in 5.6.3.6.
4.6.3.7 Vibration, sinusoidal (endurance) for sensing element
The sensing element of the RLTHD shall be capable of withstanding the effect of sinusoidal vibration as specified in 5.6.3.7.
4.6.4 Corrosion resistance
4.6.4.1 Sulphur dioxide (SO2) corrosion (endurance) for sensing element
The sensing element of the RLTHD shall be capable of withstanding exposure to an SO2 corrosive atmosphere as specified in 5.6.4.1.
4.6.4.2 Sulphur dioxide (SO2) corrosion (endurance) for sensor control unit
The sensor control unit of the RLTHD shall be capable of withstanding exposure to an SO2 corrosive atmosphere as specified in 5.6.4.2.
4.6.5 Electrical stability
4.6.5.1 Electromagnetic immunity
The RLTHD shall operate correctly when submitted to electromagnetic interference as specified in 5.6.5.1. 5 Testing, assessments and sampling methods 5.1 General
5.1.1 Atmospheric conditions for tests
Unless otherwise stated in a test procedure, the testing shall be carried out after the test specimen has been allowed to stabilize in the standard atmospheric conditions for testing as specified in EN 60068-1:1994 as follows:
If variations in these parameters have a significant effect on a measurement, then such variations should be kept to a minimum during a series of measurements carried out as part of one test on one specimen.
5.1.2 Operating conditions for tests
If a test method requires a specimen to be operational, then the specimen shall be connected to suitable supply and monitoring equipment, with characteristics as required by the manufacturer’s data. Unless otherwise specified in the test method, the supply parameters applied to the specimen shall be set within the manufacturer’s specified range(s) and shall remain constant throughout the tests. The value chosen for each parameter shall normally be the nominal value, or the mean of the specified range. If a test procedure requires a specimen to be monitored to detect any alarm or fault signals, then connections shall be made to any necessary ancillary devices (e.g. through wiring to an end-of-line device for conventional detectors to allow a fault signal to be recognized).
The details of the supply and monitoring equipment and the alarm criteria used should be given in the test report.
5.1.3 Mounting arrangements
Unless otherwise stated, the specimen shall be mounted by its normal means of attachment in accordance with the manufacturer’s instructions. If these instructions describe more than one method of mounting, then the method considered to be most unfavourable shall be chosen for each test.
5.1.4 Tolerances
Unless otherwise stated, the tolerances for the environmental test parameters shall be as specified in the basic reference standards for the test (e.g. the relevant part of EN 60068).
If a specific tolerance or deviation limit is not specified in a requirement or test procedure, then a deviation limit of ± 5 % shall be applied.
5.1.5 Procedure for measurement of response time 5.1.5.1 General
The purpose of this procedure is to establish any deviation in system response time following the environmental tests.
The specimen shall be connected to a suitable supply and monitoring equipment in accordance with 5.1.2
The response time of the RLTHD shall be measured using the heat tunnel described in Annex F.
The orientation of the sensing element in the heat tunnel shall be chosen arbitrarily and shall be the same for each measurement.
Before the measurement, stabilize the temperature of the air stream and the section of sensing element to be heated at a typical application temperature according to 4.1.2 unless otherwise specified. The measurement is then made by increasing the air temperature in the tunnel, linearly with respect to time and at the rate of rise specified in the applicable test procedure, until the supply and monitoring equipment indicates an alarm.
During the measurement, the airflow in the tunnel shall be maintained at a constant mass flow, equivalent to (0,8 ± 0,1) m/s at 25 °C. The air temperature shall be controlled to within ± 2 K of the nominal temperature required at any time during the test.
The response time, t, shall be measured from the moment the temperature starts increasing to the indication of an alarm from the supply and monitoring equipment.
5.1.5.2 Linear heat detectors
For measurement of the response time of linear heat detectors, the length of sensing element, L1 which shall be connected to the sensor control unit shall be chosen to be the worst case for the technology employed. This shall be agreed between the manufacturer and the testing laboratory.
NOTE 1 It is advised to determine the worst case taking into account the effect on the temperature measurement of noise and losses in the sensing element.
A section of (10 ± 0,1) m (Ltest) of sensing element shall be wrapped around a test frame as described in Annex C and Annex D and heated in the heat tunnel. This section shall be kept the same for all relevant tests to allow the comparison of the response time before, during and after the environmental tests.
The remaining section of the sensing element (L1 – Ltest) not exposed to the induced test temperature shall remain at ambient temperature (23 ± 5) °C during the measurement unless otherwise stated in the individual tests.
5.1.5.3 Multipoint heat detectors
For measurement of the response time of multipoint heat detectors, the length of sensing element, L1 which shall be connected to the sensor control unit shall be chosen to be the worst case for the technology employed. This shall be agreed between the manufacturer and the testing laboratory.
When testing the response time of multipoint detectors, one or more single sensors of the multipoint detector shall be placed in the centre of the tunnel measuring section (see Annex E). All other sensors shall be outside the heat tunnel and shall remain at ambient temperature (23 ± 5) °C during the measurement unless otherwise stated in the individual tests.
5.1.6 Provision for tests
Three specimens of sensor control unit, at least three specimens of sensing element and, if applicable, at least three specimens of each functional unit shall be provided to conduct the tests in 5.1.7. The exact number and length of sensing elements shall be agreed between the manufacturer and the testing laboratory.
If there are different types of sensor control units, sensing elements and/or functional units (e.g. with different environment groups), at least three specimens shall be provided for each type.
The specimens submitted shall be deemed representative of the manufacturer’s normal production with regard to their construction and calibration.
This implies that the mean response time of the three specimens as found in the reproducibility test should also represent the production mean. The limits specified in the reproducibility test should also be applicable to the manufacturer’s production.
5.1.7 Test schedule
The specimens shall be tested according to the following test schedule (see Table 3).
5.2 Test procedures nominal activation conditions/sensitivity
5.2.1 Individual alarm indication
The general visual indicator shall be visually inspected from a distance of 6 m, in a line through the indicator perpendicular to the mounting surface of the enclosure, in an ambient light intensity up to 500 lux as specified in 4.2.1.
If more than one sensing element is connected to the sensor control unit, check the presence of the separate alarm indication by visual inspection.
5.2.2 Signalling
An engineering assessment shall be carried out for the correct signalling of the alarm and fault signal(s). The following test methods shall apply to generate the alarm or fault status:
a) Sensing element faults (see 5.3.4)
b) Low voltage (see 5.4.2)
c) Procedure for measuring response time (see 5.1.5)
5.2.3 Repeatability
5.2.3.1 Object
To show that the RLTHD is stable with respect to its sensitivity, even after a number of alarm conditions.
5.2.3.2 Test procedure
The response time of the specimen to be tested shall be measured as described in 5.1.5 three times each at rates of rise of temperature of 3 Kmin-1 and 20 Kmin-1.
A recovery period as specified by the manufacturer shall be allowed between consecutive tests.
At the 3 Kmin-1 rate, the maximum response time shall be designated t(3)max and the minimum response time
t(3)min.
At the 20 Kmin-1 rate, the maximum response time shall be designated t(20)max and the minimum response time t(20)min.
5.2.3.3 Requirements
The ratio of the response times t(3)max : t(3)min shall not be greater than 1,3. The ratio of the response times t(20)max : t(20)min shall not be greater than 1,6.
5.2.4 Reproducibility
5.2.4.1 Object
To show that the sensitivity of the detector does not vary unduly from specimen to specimen and to establish response time data for comparison with the response times measured after the environmental tests.
5.2.4.2 Test procedure
The response time of the specimen to be tested shall be measured as described in 5.1.5 at rates of rise of temperature of 3
At the 20 Kmin-1 rate, the maximum response time shall be designated t(20)max and the minimum response time t(20)min.
5.2.4.3 Requirements
The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3. The ratio of the response times t(20)max : t(20)min shall be not greater than 1,6. 5.3 Test procedures operational reliability 5.3.1 Connection of ancillary devices
An engineering assessment shall be carried out for the correct operation of the detector as specified in 4.3.1.
5.3.2 Manufacturer’s adjustments
A visual inspection of a specimen shall be conducted to verify that the detector meets the requirements for manufacturer adjustments as specified in 4.3.2
5.3.3 Requirements for software controlled detectors
For detectors that rely on software for their operation, a visual inspection of samples of documentation provided by the manufacturer shall be conducted to verify that the device complies with the requirements specified in 4.3.3.
5.3.4 Sensing element fault
5.3.4.1 Object of the test
To ensure that faults on the sensing element which may prevent the proper function of the RLTHD are monitored and signalled.
5.3.4.2 Sensing element operational continuity
A fault condition corresponding to an interruption of the sensing element(s) in operation shall be generated while the RLTHD is monitored.
If a sensing element consists of more than one conductor/optical fibre/tube, each of them shall also be interrupted individually.
5.3.4.3 Requirements
The fault condition shall be detected and signalled within 300 s. No alarm signal shall be triggered.
5.3.5 On-site adjustment of response behaviour
A visual inspection shall be conducted to verify that the detector meets the requirements for on-site adjustment of response behaviour as specified in 4.3.5.
5.3.6 Maximum ambient temperature test (sensing element)
5.3.6.1 Object
To demonstrate the ability of the RLTHD to function correctly even if the sensing element is exposed to high ambient temperature appropriate to the anticipated service temperature.
5.3.6.2 Mounting of the sensing element
The maximum length of sensing element shall be mounted in a heat chamber in a way that allows it to be heated up such that the temperature difference between any two points at the surface of the sensing element is not more than 5 K. A suitable test arrangement shall be agreed between the testing laboratory and the manufacturer and shall be supplied by the manufacturer.
5.3.6.3 Test procedure
Starting from the typical application temperature the temperature inside the heat chamber shall be increased with a rate of rise of temperature of <0,1 Kmin-1 up to the maximum application temperature (see 4.1.2). This temperature level shall be maintained for 16 h.
Immediately after the exposure period the sensing element shall be stimulated by a means, agreed between manufacturer and testing laboratory, to trigger an alarm signal.
5.3.6.4 Requirements
No alarm or fault signal shall be given during the initial temperature increase and the 16 h stabilisation period. The RLTHD shall give an alarm signal by stimulation after the exposure period. 5.4 Tolerance to supply voltage
5.4.1 Variation in supply parameters
5.4.1.1 Object
To show that, within the specified range(s) of the supply parameters (e.g. voltage), the sensitivity of the RLTHD is not unduly dependent on these parameters.
5.4.1.2 Test procedure
The response time of the specimen to be tested shall be measured as described in 5.1.5 at a rate of rise of temperature of 3 Kmin-1 and at the upper and lower limits of the supply parameter (e.g. voltage) range(s) specified by the manufacturer.
A recovery period as specified by the manufacturer shall be allowed between consecutive tests.
The maximum response time shall be designated t(3)max and the minimum response time t(3)min.
NOTE For conventional RLTHD the supply parameter is the dc voltage applied to the sensor control unit. For other types of detector signal levels and timing may need to be considered. If necessary the manufacturer may be requested to provide suitable supply equipment to allow the supply parameters to be changed as required.
5.4.1.3 Requirements
The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3.
5.4.2 Low voltage fault
5.4.2.1 Object
To show that, the sensor control unit is able to signal a fault condition when its input power supply falls below the minimum voltage specified by the manufacturer (see 5.4.1).
5.4.2.2 Test procedure
The specimen shall be mounted as described in 5.1.3 and shall be connected to supply and monitoring equipment as described in 5.1.2. The sensor control unit shall be operated at its maximum loading and at the lower voltage specified by the manufacturer (as tested in 5.4.1).
The supply voltage to the sensor control unit shall then be lowered by 15 %.
NOTE Maximum loading can include optional cards, power consuming sensor cables, etc.
5.4.2.3 Requirements
The sensor control unit shall signal a fault condition within 100 s following the voltage being lowered. 5.5 Performance parameters under fire conditions 5.5.1 Fire sensitivity for room protection application
5.5.1.1 Object
To show that the RLTHD (for room protection application) has, depending on its classification, an adequate sensitivity to the heat release of a real test fire as required for general application in fire detection systems.
5.5.1.2 Principle
A part of the sensing element of the RLTHD is mounted as described in Annex A and is exposed to three defined test fires described in Annex B. That part of the sensing element not installed in the fire test room shall remain in stable environmental conditions, as specified in 5.5.1.5.
5.5.1.3 Fire test room
The fire sensitivity tests shall be conducted in a rectangular room with a flat horizontal ceiling, and the following dimensions:
The fire test room shall be equipped with a temperature probe arranged as indicated in Annex A.
5.5.1.4 Test fires
The sensing element of the specimen shall be subjected to the three test fires TF6F, TF6 and TF6S (see Annex B).
The type, quantity and arrangement of the fuel and the method of ignition are described in Annex B along with the end of test condition and the required profile curve limits.
In order to be a valid test fire, the development of the fire shall be such that the test validity criteria in Annex B are fulfilled. It is permissible, and may be necessary, to adjust the quantity, condition and arrangement of the fuel to obtain valid test fires.
5.5.1.5 Mounting of the specimens
A length of (10 ± 0,2) m of the sensing element of the specimen shall be mounted on the fire test room ceiling in the designated area (see Annex A) in such a manner, that the sensing element has at least a horizontal distance of 2 m from the centre of the test fire. The specimen shall be mounted in accordance to the manufacturer’s instructions. If these instructions describe more than one method of mounting then the method considered to be most unfavourable shall be chosen for each test.
Sensing elements of multipoint RLTHD shall be installed so that at least 1 sensor is arranged within the fire test room. This sensor shall be located on the 3 m radius (Position D). If there is more than 1 sensor in the test room then one sensor shall be located on the 3 m radius (Position D).
That part of the sensing element not installed in the fire test room and the sensor control unit shall remain at an air temperature T = (23 ± 5) °C, and the air movement negligible.
The length of the sensing element under test (10 m) plus the length of the sensing element not installed in the fire test room shall be the maximum length of sensing element in accordance with manufacturer’s specification.
The position of the part of the sensing element under test shall be chosen such that it represents the least sensitive response behaviour of the RLTHD. A typical example of a test setup is shown in Figure A.2.
The RLTHD shall be connected to its supply and monitoring equipment, as described in 5.1.2, and shall be allowed to stabilize in its quiescent condition before the start of the test fire.
Detectors which dynamically modify their sensitivity in response to varying ambient conditions, may require special reset procedures and/or stabilization times. The manufacturer’s guidance should be sought in such cases to ensure that the state of the detectors at the start of each test is representative of their normal quiescent state.
5.5.1.6 Initial conditions
Before each test fire the room shall be ventilated with clean air until it is free from fire products and so that the conditions listed below can be obtained.
The ventilation system shall then be switched off and all doors, windows and other openings shall be closed. The air in the room shall then be allowed to stabilize and the following conditions shall be obtained before the test is started:
5.5.1.7 Recording of the fire parameters and response times
During each test fire the temperature T [°C] (measuring defined in Annex B on the 3 m circle) shall be recorded continuously or at least once per second.
The alarm signal given by the RLTHD shall be taken as the indication that a specimen has responded to the test fire.
The time of response of each specimen shall be recorded along with the test fire temperature T at the moment of response.
5.5.1.8 Requirements
The RLTHD shall generate an alarm signal, in its assigned response class, according to the response time in Table 4.
5.5.2.1 Object
To show that the RLTHD has, depending on its classification, an adequate sensitivity to a slow rate of rise of temperature.
5.5.2.2 Test procedure for non-integrating linear and multipoint RLTHD
5.5.2.2.1 Principle
A part of the sensing element of the RLTHD is mounted in a heat tunnel as described in Annex C and Annex E and is exposed to a static temperature test.
5.5.2.2.2 Test procedure for non-integrating linear RLTHD
5.5.2.2.2.1 Mounting of the sensing element
For measurement of the sensitivity of the non-integrating linear RLTHD the length of sensing element, L1 that shall be connected to the sensor control unit shall be chosen to be the worst case for the technology employed. This shall be agreed between the manufacturer and the testing laboratory.
NOTE 1 It is advised to determine the worst case taking into account the effect on the temperature measurement of noise and losses in the sensing element.
A section of (10 ± 0,1) m (Ltest) of sensing element shall be wrapped around a test frame as described in Annex C and heated in the heat tunnel.
The position of the part of the sensing element under test shall be chosen such that it represents the least sensitive response behaviour of the RLTHD. A typical example of a test setup is shown in Figure C.1.
5.5.2.2.2.2 Initial conditions
Before the measurement, the temperature of the air stream and the section of sensing element at the typical ambient temperature for the appropriate response class as specified in 4.1.2 shall be stabilized.
For non-integrating linear RLTHD the remaining section of the sensing element (L1 – Ltest) not exposed to the induced test temperature shall be stabilised at an ambient temperature of (23 ± 5) °C during the measurement.
The sensor control unit shall be operated at an ambient temperature of (23 ± 5) °C during the measurement.
5.5.2.2.2.3 Measurement of response temperature
The measurement shall then be done by increasing the air temperature in the tunnel from the initial condition at a rate of rise of 1 K min-1 until the applicable maximum application temperature is reached as specified in 4.1.2 according to the appropriate class. Thereafter the test shall be continued at a maximum rate of rise of air temperature of 0,2 K min-1 until the sensor control unit annunciate an alarm.
During the measurement, the airflow in the tunnel shall be maintained at a constant mass flow, equivalent to (0,8 ± 0,1) m/s at 25 °C. The air temperature shall be controlled to within ± 2 K of the nominal temperature required at any time during the test.
The measured temperature at the moment the sensor control unit indicates an alarm shall be recorded.
5.5.2.2.3 Test procedure for multipoint RLTHD
5.5.2.2.3.1 Mounting of the sensing element
For measurement of the sensitivity of the multipoint RLTHD the length of sensing element, L1 that is to be connected to the sensor control unit shall be chosen to be the worst case for the technology employed. This shall be agreed between the manufacturer and the testing laboratory.
NOTE It is advised to determine the worst case taking into account the effect on the temperature measurement of noise and losses in the sensing element.
When testing the response temperature of multipoint detectors, the minimum number of sensors within a 10 m section of sensing element Ltest shall be placed in the tunnel measuring section as described in Annex E.
The position of the part of the sensing element under test shall be chosen such that it represents the least sensitive response behaviour of the RLTHD. A typical example of a test setup is shown in Figure E.1.
5.5.2.2.3.2 Initial conditions
Before the measurement, the temperature of the air stream and the section of sensing element Ltest at the typical ambient temperature for the appropriate response class as specified in 4.1.2 shall be stabilized.
The remaining section of the sensing element (L1 – Ltest) not exposed to the induced test temperature shall be stabilised at an ambient temperature of (23 ± 5) °C during the measurement.
The sensor control unit shall be operated at an ambient temperature of (23 ± 5) °C during the measurement.
5.5.2.2.3.3 Measurement of response temperature
The measurement shall then be done by increasing the air temperature in the tunnel from the initial condition at a rate of rise of 1 Kmin-1 until the applicable maximum application temperature is reached as specified in 4.1.2 according to the appropriate class. Thereafter the test shall be continued at a maximum rate of rise of air temperature of 0,2 K min-1 until the sensor control unit annunciate an alarm.
During the measurement, the airflow in the tunnel shall be maintained at a constant mass flow, equivalent to (0,8 ± 0,1) m/s at 25°C. The air temperature shall be controlled to within ± 2 K of the nominal temperature required at any time during the test (see Annex E).
The measured temperature at the moment the sensor control unit indicates an alarm shall be recorded. 5.5.2.3 Test procedure for integrating linear RLTHD 5.5.2.3.1 Principle
5.5.2.3.2 Mounting of the sensing element
The sensing element shall be mounted in a heat chamber in a way that allows the sensing element to be heated homogeneously. A suitable test arrangement shall be agreed between the testing laboratory and the manufacturer and shall be supplied by the manufacturer.
5.5.2.3.3 Initial conditions
Before the measurement, the temperature in the heat chamber at the typical ambient temperature for the appropriate response class as specified in 4.1.2. shall be stabilized.
The sensor control unit shall be operated at an ambient temperature of (23 ± 5) °C during the measurement.
5.5.2.3.4 Measurement of response temperature
The measurement shall then be done by increasing the air temperature in the heat chamber from the initial condition at a rate of rise of < 0,5 K min-1 until the applicable maximum application temperature is reached as specified in 4.1.2 according to the appropriate class. Thereafter the test shall be continued at a maximum rate of rise of air temperature of 0,2 K min-1 until the sensor control unit annunciate an alarm.
The air temperature shall be controlled to within ± 2 K of the nominal temperature required at any time during the test.
The measured temperature at the moment the sensor control unit indicates an alarm shall be recorded. 5.5.2.4 Requirements
The detector tested shall respond between the minimum and maximum static response temperatures shown in 4.1.2, according to the class of the detector.
5.6 Durability of nominal activation conditions/sensitivity
5.6.1 Temperature resistance
5.6.1.1 Dry heat (operational) test for sensor control unit
5.6.1.1.1 Object
To demonstrate the ability of the sensor control unit to function correctly at high ambient temperatures appropriate to the anticipated service environment.
5.6.1.1.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-2:2007, Test Bb or Bd, and as indicated below.
5.6.1.1.3 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 and shall be connected to supply and monitoring equipment as described in 5.1.2.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
5.6.1.1.4 Conditioning
The conditioning shall be applied to the sensor control unit in accordance with the applicable environmental group shown in Measurements during conditioning
The specimen shall be monitored during the conditioning period to detect any fault or alarm condition. During the last hour of the conditioning stimulate an alarm condition by means agreed with the manufacturer.
5.6.1.1.6 Final measurements
After the conditioning and a recovery period of at least 1 h, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.1.1.7 Requirements
No alarm or fault signal shall be given during the period that the temperature is increasing to the stabilization temperature or during the stabilized period.
An alarm shall be generated when stimulated according to 5.6.1.1.5. An alarm shall be generated during the functional test in 5.6.1.1.6. The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3. 5.6.1.2 Dry heat (endurance) for sensing element
5.6.1.2.1 Object of the test
To demonstrate the ability of the RLTHD sensing element to withstand long term ageing effects.
5.6.1.2.2 Principle
The test consists of exposure of the sensing element specimen to the high temperature, for a long period to accelerate ageing effects.
5.6.1.2.3 Reference
5.6.1.2.4 State of the specimen during conditioning
The specimen shall not be supplied with power during conditioning and tests for non heat-dissipating specimens shall apply (i.e. Tests Ba or Bb).
5.6.1.2.5 Conditioning
Conditioning shall be applied to the specimen as indicated in the Table 6.
Table 6 — Conditions for dry heat (endurance) test for sensing elements
5.6.1.2.6 Final measurements
After the conditioning and a recovery period of at least 1 h, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
5.6.1.2.7 Requirements
No alarm or fault signal shall be given after powering the sensing element at the end of the conditioning and recovery periods.
The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3. 5.6.1.3 Cold (operational) for sensing element
5.6.1.3.1 Object
To demonstrate the ability of the RLTHD to function correctly even if the sensing element is exposed to low ambient temperatures appropriate to the anticipated service environment.
5.6.1.3.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-1: 2007, test Ab.
5.6.1.3.3 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 and shall be connected to supply and monitoring equipment as described in 5.1.2.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
The sensor control unit shall be maintained at normal ambient conditions defined in 5.1.1.
5.6.1.3.4 Conditioning
Conditioning shall be applied to the specimen as indicated in the Table 7.
5.6.1.3.5 Measurements during conditioning
The specimen shall be monitored during the conditioning period to detect any fault or alarm condition.
5.6.1.3.6 Final measurements
After the conditioning and a recovery period of at least 1 h, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
5.6.1.3.7 Requirements
No alarm or fault signal shall be given during the period that the temperature is decreasing to the stabilization temperature or during the stabilized period.
The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3. 5.6.1.4 Cold (operational) for sensor control unit
5.6.1.4.1 Object
To demonstrate the ability of the RLTHD sensor control unit to function correctly at low ambient temperatures appropriate to the anticipated service environment.
5.6.1.4.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-1:2007.
The tests with gradual changes in temperature shall be used. Test Ad shall be used for heat-dissipating specimens (as defined in EN 60068-2-1) and test Ab for non heat-dissipating specimens.
5.6.1.4.3 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 and shall be connected to supply and monitoring equipment as described in 5.1.2.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
The sensing element shall be maintained at normal ambient conditions defined in 5.1.1.
5.6.1.4.4 Conditioning
Conditioning shall be applied to the specimen as indicated in the Table 8.
NOTE If the sensor control unit and the sensing element belongs to the same environmental group the test can be done concurrently with 5.6.1.3.
5.6.1.4.5 Measurements during conditioning
The specimen shall be monitored during the conditioning period to detect any fault or alarm condition. During the last hour of the conditioning simulate an alarm condition by means agreed with the manufacturer.
5.6.1.4.6 Final measurements
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.1.4.7 Requirements
No alarm or fault signal shall be given during the period that the temperature is decreasing to the stabilization temperature or during the stabilized period.
An alarm shall be generated during the functional test in 5.6.1.4.6.
The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3.
5.6.2 Humidity resistance
5.6.2.1 Damp heat, steady state (endurance) for sensor control unit and sensing element
5.6.2.1.1 Object
To demonstrate the ability of the RLTHD (sensor control unit and sensing element) to withstand the long-term effects of humidity in the service environment (e.g. changes in electrical properties of materials, chemical reactions involving moisture, galvanic corrosion etc.).
5.6.2.1.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-78:2001, test Cab.
5.6.2.1.3 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 but shall not be supplied with power during the conditioning.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5
5.6.2.1.4 Conditioning
Conditioning shall be applied to the specimen as indicated in the Table 9.
5.6.2.1.5 Final measurements
After the conditioning and a recovery period of at least 1 h at standard laboratory conditions, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.2.1.6 Requirements
The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3. 5.6.2.2 Damp heat, cyclic (operational) for sensing element
5.6.2.2.1 Object of the test
To demonstrate the ability of the RLTHD to function correctly even if the sensing element is exposed to high relative humidity which may occur for short periods in the anticipated service environment.
5.6.2.2.2 Principle
The lower severity (with an upper temperature of 40 °C) is intended for areas where light condensation may infrequently occur for short periods (e.g. during the warming up of storage areas with limited or no temperature control).
The higher severity (with an upper temperature of 55 °C) is intended for areas where heavy and/or frequent condensation can occur (e.g. outdoors or in wet rooms etc.)
5.6.2.2.3 Reference
The test apparatus and procedure shall be as described in EN 60068-2-30:2005, using the Variant 2 test cycle and controlled recovery conditions.
5.6.2.2.4 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 and shall be connected to the supply and monitoring equipment as described in 5.1.2.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
The sensor control unit shall be maintained at normal ambient conditions defined in 5.1.1.
5.6.2.2.5 Conditioning
Conditioning shall be applied to the specimen as indicated in the Table 10.
NOTE 2 For RLTHD class A1 and A2 system under environmental group III the minimum static response temperature is 54°C so it could be possible that the system triggers an alarm if it works at the lower end of the tolerance. Therefore the minimum static response temperature needs to be greater than 55 °C plus the tolerance of 2 °C.
5.6.2.2.6 Measurements during conditioning
The specimen shall be monitored during the conditioning period to detect any fault or alarm condition.
5.6.2.2.7 Final measurements
After the conditioning and a recovery period of at least 1 h, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.2.2.8 Requirements
No alarm or fault signal shall be given during the conditioning and the following recovering period. The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3. 5.6.2.3 Damp heat, cyclic (operational) for sensor control unit
5.6.2.3.1 Object of the test
To demonstrate the ability of the RLTHD sensor control unit to function correctly at high relative humidity which may occur for short periods during the anticipated service environment.
5.6.2.3.2 Principle
The lower severity (with an upper temperature of 40 °C) is intended for areas where light condensation may infrequently occur for short periods (e.g. during the warming up of storage areas with limited or no temperature control).
The higher severity (with an upper temperature of 55 °C) is intended for areas where heavy and/or frequent condensation can occur (e.g. outdoors or in wet rooms etc.)
5.6.2.3.3 Reference
The test apparatus and procedure shall be as described in EN 60068-2-30:2005 using the Variant 2 test cycle and controlled recovery conditions.
NOTE The test consists of exposing the specimen to cyclic temperature variations between 25 °C and the appropriate upper temperature (40 °C or 55 °C). The relative humidity is maintained at (93 ± 3) % during the high temperature phase and above 95 % during the low temperature and temperature changing phases. The rates of increase of temperature are such that condensation should occur on the surface of the specimen.
5.6.2.3.4 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 and shall be connected to the supply and monitoring equipment as described in 5.1.2.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
5.6.2.3.5 Conditioning
Conditioning shall be applied to the specimen as indicated in the Table 11.
NOTE 1 If the sensor control unit and the sensing element belong to the same environmental group the test can be done concurrently with 5.6.2.2.
NOTE 2 If the sensor control unit is classified in environmental group I then the damp heat, steady state (operational) test for sensor control units is conducted instead.
5.6.2.3.6 Measurements during conditioning
The specimen shall be monitored during the conditioning period to detect any fault or alarm condition. During the last hour of the conditioning simulate an alarm condition by means agreed with the manufacturer.
5.6.2.3.7 Final measurements
After the conditioning and a recovery period of at least 1 h, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.2.3.8 Requirements
No alarm or fault signal shall be given during the conditioning and the following recovering period.
An alarm shall be generated during the functional test in 5.6.2.3.7.
The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3
5.6.2.4 Damp heat, steady state (operational) for sensor control unit
5.6.2.4.1 Object of the test
To demonstrate the ability of the sensor control unit to function correctly at high relative humidity (without condensation) which may occur for short periods in the service environment.
5.6.2.4.2 Principle
The test consists of exposing the specimen to a constant temperature and a constant high relative humidity, in such a manner that condensation does not occur on the specimen.
5.6.2.4.3 Reference
The test apparatus and procedure shall be as described in EN 60068-2-78:2001 Test Cab.
5.6.2.4.4 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 and shall be connected to the supply and monitoring equipment as described in 5.1.2.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
The sensing element shall be maintained at normal ambient conditions defined in 5.1.1.
5.6.2.4.5 Final measurements
After the conditioning and a recovery period of at least 1 h, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.2.4.6 Requirements
No alarm or fault signal shall be given during the conditioning and the following recovering period.
An alarm shall be generated during the functional test in 5.6.2.4.7.
The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3.
5.6.2.5 Damp heat, cyclic (endurance) for sensor control unit and sensing element
5.6.2.5.1 Object
To demonstrate the ability of the RLTHD to withstand the long-term effects of high humidity in the service environment (e.g. changes in electrical properties of materials, chemical reactions involving moisture, galvanic corrosion, etc.).
5.6.2.5.2 Principle
The conditioning to this test is applicable to the sensing element and/or sensor control unit of environmental group III.
5.6.2.5.3 Reference
The test apparatus and procedure shall be as described in EN 60068-2-30:2005 using the Variant 2 test cycle and controlled recovery conditions.
5.6.2.5.6 Final measurements
After the conditioning and a recovery period of at least 1 h at standard laboratory conditions, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
5.6.2.5.7 Requirements
No alarm or fault signal shall be given after powering the RLTHD at the end of the conditioning and recovery periods.
The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3.
5.6.3 Shock and vibration resistance
5.6.3.1 Shock (operational) for sensor control unit
5.6.3.1.1 Object
To demonstrate the immunity of the RLTHD sensor control unit to mechanical shocks, which are likely to occur, albeit infrequently, in the anticipated service environment.
5.6.3.1.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-27:2009, test Ea, except that the conditioning shall be as described below.
5.6.3.1.3 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 to a rigid fixture, and shall be connected to its supply and monitoring equipment as described in 5.1.2.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
5.6.3.1.4 Conditioning
For specimens with a mass < 4,75 kg conditioning shall be applied to the specimen as indicated in the Table 14. For specimens with a mass > 4,75 kg no test shall be applied.
5.6.3.1.5 Measurements during conditioning
The specimen shall be monitored during the conditioning period and for a further 2 min to detect any change.
5.6.3.1.6 Final measurements
After the conditioning and the further 2 min, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
5.6.3.1.7 Requirements
No alarm or fault signal shall be given during conditioning and the further 2 min. The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3. 5.6.3.2 Impact (operational) for sensor control unit
5.6.3.2.1 Object
To demonstrate the immunity of the RLTHD sensor control unit to mechanical impacts upon its surface, which it may sustain in the normal service environment, and which it can reasonably be expected to withstand.
5.6.3.2.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-75:1997, test Eh.
5.6.3.2.3 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 to a rigid structure, as required by EN 60068-2-75:1997, and shall be connected to its supply and monitoring equipment as described in 5.1.2.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
5.6.3.2.4 Conditioning
Impacts shall be applied to all accessible surfaces of the specimen. For all such surfaces three blows shall be applied to any point(s) considered likely to cause damage to or impair the operation of the specimen.
Care should be taken to ensure that the results from a series of three blows do not influence subsequent series. In case of doubts, the defect shall be disregarded and a further three blows shall be applied to the same position on a new specimen.
Conditioning shall be applied to the specimen as indicated in the Table 15.
5.6.3.2.5 Measurements during conditioning
The specimen shall be monitored during the conditioning period and for a further 2 min to detect any change.
5.6.3.2.6 Final measurements
After the conditioning and the further 2 min, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
5.6.3.2.7 Requirements
No alarm or fault signal shall be given during conditioning and the further 2 min. The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3. 5.6.3.3 Impact (operational) for sensing element
5.6.3.3.1 Object
To demonstrate the ability of the RLTHD to function correctly even if the sensing element is exposed to mechanical impacts upon its surface, which it may sustain in the normal service environment, and which it can reasonably be expected to withstand.
5.6.3.3.2 Test Apparatus
The test apparatus shall be as shown in Annex I.
5.6.3.3.3 State of the specimen(s) during conditioning
The specimen shall be mounted as described in 5.1.3 and shall be connected to its supply and monitoring equipment as described in 5.1.2.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
5.6.3.3.4 Conditioning
A section of the sensing element shall be placed on the base of the apparatus described in Annex I either under a round edged intermediate piece or, at a right angle, under the chisel edged intermediate piece. The section of the sensing element shall be chosen as that most likely to impair the normal functioning of the specimen.
The first part of the conditioning is to be conducted using the round edged intermediate piece with the sensing element placed beneath it. Allow the hammer to fall from a height of (200 ± 10) mm.
After a period of at least 2 min the second part of the conditioning is to be applied to a different position of the sensing element, using the chisel edged intermediate piece with the sensing element placed in a right angle beneath it. Allow the hammer to fall from a height of (200 ± 10) mm.
Conditioning shall be applied to the specimen as indicated in the Table 16.
5.6.3.3.5 Measurements during conditioning
5.6.3.3.6 Final measurements
After the conditioning and the further 2 min, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.3.3.7 Requirements
No alarm or fault signal shall be given during conditioning and the further 2 min.
Although there may be visible distortion to the sheath of the sensing element where it was impacted, there shall be no visible cracking or cutting of the sheath.
The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3.
5.6.3.4 Vibration, sinusoidal (operational) for sensor control unit
5.6.3.4.1 Object
To demonstrate the immunity of the RLTHD sensor control unit to vibration at levels considered appropriate to the normal service environment.
5.6.3.4.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-6:2008.
5.6.3.4.3 State of the specimen during conditioning
The specimen shall be mounted on a rigid fixture as described in 5.1.3 and shall be connected to its supply and monitoring equipment as described in 5.1.2. The vibration shall be applied in each of three mutually perpendicular axes, in turn. The specimen shall be mounted so that one of the three axes is perpendicular to its normal mounting plane.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
5.6.3.4.4 Conditioning
Conditioning shall be applied to the specimen as indicated in the Table 17.
5.6.3.4.5 Measurements during conditioning
The specimen shall be monitored during the conditioning period to detect any fault or alarm condition.
5.6.3.4.6 Final measurements
After the conditioning, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.3.4.7 Requirements
No alarm or fault signal shall be given during conditioning.
The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3.
5.6.3.5 Vibration, sinusoidal (operational) for sensing element
5.6.3.5.1 Object
To demonstrate the ability of the RLTHD to function correctly even if the sensing element is exposed to vibration at levels considered appropriate to the normal service environment.
5.6.3.5.2 Reference
The test apparatus and the procedure shall be as described in EN 60068-2-6:2008 and as defined below.
5.6.3.5.3 State of the specimen during conditioning
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
A section of approximately 2 m of sensing element shall be mounted on the test apparatus as described in Annex H and shall be connected to its supply and monitoring equipment as described in 5.1.2. The vibration shall be applied in the vertical axis.
For multipoint sensing elements a sensor shall be within the 2 m section under test located centrally between two of the three mounting brackets.
5.6.3.5.4 Conditioning
Conditioning shall be applied to the specimen as indicated in the Table 18.
5.6.3.5.5 Measurements during conditioning
The specimen shall be monitored during the conditioning period to detect any fault or alarm condition.
5.6.3.5.6 Final measurements
After the conditioning, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.3.5.7 Requirements
No alarm or fault signal shall be given during conditioning.
The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3.
5.6.3.6 Vibration, sinusoidal (endurance) for sensor control unit
5.6.3.6.1 Object
To demonstrate the ability of the RLTHD sensor control unit to withstand the long term effects of vibration at levels appropriate to the service environment.
5.6.3.6.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-6:2008.
5.6.3.6.3 State of the specimen during conditioning
The specimen shall be mounted on a rigid fixture as described in 5.1.3, but shall not be supplied with power during conditioning. The vibration shall be applied in each of three mutually perpendicular axes, in turn. The specimen shall be mounted so that one of the three axes is perpendicular to its normal mounting axis.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
5.6.3.6.4 Conditioning
Conditioning shall be applied to the specimen as indicated in the Table 19.
5.6.3.6.5 Final measurements
After the conditioning, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.3.6.6 Requirements
No alarm or fault signal shall be given after powering the RLTHD at the end of the conditioning. The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3. 5.6.3.7 Vibration, sinusoidal (endurance) for sensing element
5.6.3.7.1 Object
To demonstrate the ability of the RLTHD sensing element to withstand the long term effects of vibration at levels appropriate to the service environment.
5.6.3.7.2 Reference
The test apparatus and the procedure shall be as described in EN 60068-2-6:2008 and as described below.
5.6.3.7.3 State of the specimen during conditioning
A section of approximately 2 m of sensing element shall be mounted on the test apparatus as described in Annex H and shall not be supplied with power during the conditioning. The vibration shall be applied in the vertical axis.
For multipoint sensing elements a sensor shall be within the 2 m section under test located centrally between two of the three mounting brackets.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
5.6.3.7.5 Final measurements
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.3.7.6 Requirements
No alarm or fault signal shall be given after powering the RLTHD at the end of the conditioning. The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3. 5.6.4 Corrosion resistance
5.6.4.1 Sulphur dioxide (SO2) corrosion (endurance) for sensing element
5.6.4.1.1 Object
To demonstrate the ability of the RLTHD sensing element to withstand the corrosive effects of sulphur dioxide as an atmospheric pollutant.
5.6.4.1.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-42:2003, test Kc, except that the conditioning shall be as described below.
5.6.4.1.3 State of the specimen during conditioning
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5. except that the length of sensing element to be exposed shall be the 10 m section LTest which is to be used for the response test (see 5.1.5.). In order to conduct the test, the section of the sensing element to be exposed to the corrosive atmosphere shall be disconnected from the remainder of the sample and its open ends shall be sealed in accordance with the manufacturer’s instructions.
NOTE If the sensor control unit and the sensing element belong to the same environmental group the test can be done concurrently with 5.6.4.2.
5.6.4.1.5 Final measurements
Immediately after the conditioning, the specimen shall be subjected to a drying period of 16 h at (40 ± 2) °C, < 50 % RH, followed by a recovery period of at least 1 h at the standard laboratory conditions.
After the recovery period the section LTest shall be reconnected to the remainder of the sensing element and the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
5.6.4.1.6 Requirements
No alarm or fault signal shall be given after powering the RLTHD at the end of the conditioning and recovery periods.
The ratio of the response times t(3)max: t(3)min shall be not greater than 1,3. 5.6.4.2 Sulphur dioxide (SO2) corrosion (endurance) for sensor control unit
5.6.4.2.1 Object
To demonstrate the ability of the RLTHD sensor control unit to withstand the corrosive effects of sulphur dioxide as an atmospheric pollutant.
5.6.4.2.2 Reference
The test apparatus and procedure shall be as described in EN 60068-2-42:2003, test Kc, except that the conditioning shall be as described below.
5.6.4.2.3 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3. It shall not be supplied with power during the conditioning.
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD NOTE If the sensor control unit and the sensing element belongs to the same environmental group the test can be done concurrently with 5.6.4.1.
5.6.4.2.5 Final measurements
Immediately after the conditioning, the specimen shall be subjected to a drying period of 16 h at (40 ± 2) °C, < 50 % RH, followed by a recovery period of at least 1 h at the standard laboratory conditions.
After the recovery period, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
5.6.4.2.6 Requirements
No alarm or fault signal shall be given after powering the RLTHD at the end of the conditioning and recovery periods.
The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3. 5.6.5 Electrical stability
5.6.5.1 Electromagnetic compatibility (EMC), immunity tests (operational)
5.6.5.1.1 General
The following EMC immunity tests as specified in EN 50130-4:2011 shall be carried out:
5.6.5.1.2 State of the specimen during conditioning
The length of sensing element used in the test shall correspond to the most unfavourable operating condition of the RLTHD technology under test. The configuration shall be the same as chosen in 5.1.5.
5.6.5.1.3 Final measurements
After the conditioning, the functional test as described in 5.1.5 shall be conducted at a rate of rise of 3 Kmin-1 and the response time recorded.
The greater response time value measured in this test and that measured for the same specimen in the reproducibility test, shall be designated t(3)max and the lesser shall be designated t(3)min.
5.6.5.1.4 Requirements
For these tests the criteria for compliance specified in EN 50130-4:2011 and the following shall apply
No alarm or fault signal shall be given during conditioning.
The ratio of the response times t(3)max : t(3)min shall be not greater than 1,3.
6 Assessment and verification of constancy of performance (AVCP)
6.1 General
The compliance of the resettable line-type heat detectors with the requirements of this Standard and with the performance declared by the manufacturer in the DoP shall be demonstrated by:
— determination of product type,
The manufacturer shall always retain the overall control and shall have the necessary means to take responsibility for the conformity with its declared performance(s).
6.2 Type testing
6.2.1 General
All performances related to characteristics included in this standard shall be determined when the manufacturer intends to declare the respective performances unless the standard gives provisions for declaring them without performing tests. (e.g. use of previously existing data, CWFT and conventionally accepted performance).
Assessment previously performed in accordance with the provisions of this standard, may be taken into account provided that they were made to the same or a more rigorous test method, under the same AVCP system on the same product or products of similar design, construction and functionality, such that the results are applicable to the product in question.
NOTE 1 Same AVCP system means testing by an independent third party under the responsibility of a notified product certification body.
For the purpose of assessment manufacturer’s products may be grouped into families where it is considered that the results for one or more characteristics from any one product within the family are representative for that same characteristics for all products within that same family.
NOTE 2 Products can be in different families for different characteristics.
NOTE 3 It is advised to make reference to the assessment method standards to allow the selection of a suitable representative sample.
In addition, the determination of the product type shall be performed for all characteristics included in the standard for which the manufacturer declares the performance:
— at the beginning of the production of a new or modified resettable line-type heat detector (unless a member of the same product range), or
— at the beginning of a new or modified method of production (where this may affect the stated properties); or
they shall be repeated for the appropriate characteristic(s), whenever a change occurs in the resettable line- type heat detector design, in the raw material or in the supplier of the components, or in the method of production (subject to the definition of a family), which would affect significantly one or more of the characteristics.
Where components are used whose characteristics have already been determined, by the component manufacturer, on the basis of assessment methods of other product standards, these characteristics need not be re-assessed. The specifications of these components shall be documented.
Products bearing regulatory marking in accordance with appropriate harmonized European specifications may be presumed to have the performances declared in the DoP, although this does not replace the responsibility on the manufacturer to ensure that the resettable line-type heat detector as a whole is correctly manufactured and its component products have the declared performance values.
6.2.2 Test samples, testing and compliance criteria
Table 23 — Number of samples to be tested and compliance criteria
Characteristic Requirement Assessment method No. of samples Compliance criteria
Nominal activation conditions/sensitivity 4.2 5.2 3 4.2
Operational reliability 4.3 5.3 3 4.3
Tolerance to supply voltage 4.4 5.4 3 4.4
Performance parameters under fire conditions 4.5 5.5 3 4.5
Durability of nominal activation conditions/sensitivity 4.6 5.6 3 4.6
6.2.3 Test reports
The results of the determination of the product type shall be documented in test reports. All test reports shall be retained by the manufacturer for at least 10 years after the last date of production of the resettable line- type heat detector to which they relate.
6.3 Factory production control (FPC)
6.3.1 General
The manufacturer shall establish, document and maintain an FPC system to ensure that the products placed on the market comply with the declared performance of the essential characteristics.
The FPC system shall consist of:
— procedures,
— regular inspections, tests and/or assessments,
— the use of the results to control:
— raw and other incoming materials or components,
— equipment,
— the production process and the product.
All the elements, requirements and provisions adopted by the manufacturer shall be documented in a systematic manner in the form of written policies and procedures. This factory production control system documentation shall:
— ensure a common understanding of the evaluation of the constancy of performance,
— enable the achievement of the required product performances,
— enable the effective operation of the production control system to be checked.
6.3.2 Requirements 6.3.2.1 General
The manufacturer is responsible for organizing the effective implementation of the FPC system in line with the content of this product standard. Tasks and responsibilities in the production control organization shall be documented and this documentation shall be kept up-to-date.
The responsibility, authority and the relationship between personnel that manages, performs or verifies work affecting product constancy shall be defined. This applies in particular to personnel that need to initiate actions preventing product non-constancies from occurring, actions in case of non-constancies and to identify and register product constancy problems.
Personnel performing work affecting the constancy of performance of the product shall be competent on the basis of appropriate education, training, skills and experience for which records shall be maintained.
In each factory the manufacturer may delegate the action to a person having the necessary authority to:
— identify procedures to demonstrate constancy of performance of the product at appropriate stages;
— identify and record any instance of non-constancy;
— identify procedures to correct instances of non-constancy.
The manufacturer shall draw up and keep up-to-date documents defining the FPC. The manufacturer’s documentation and procedures should be appropriate to the product and manufacturing process and the FPC system should achieve an appropriate level of confidence in the constancy of performance of the product. This involves:
a) the preparation of documented procedures and instructions relating to factory production control operations, in accordance with the requirements of the technical specification to which reference is made;
b) the effective implementation of these procedures and instructions;
c) the recording of these operations and their results;
d) the use of these results to correct any deviations, repair the effects of such deviations, treat any resulting instances of non-conformity and, if necessary, revise the FPC to rectify the cause of non-constancy of performance.
Where subcontracting takes place, the manufacturer shall retain the overall control of the product and ensure that he receives all the information that is necessary to fulfil his responsibilities according to this European Standard.
If the manufacturer has part of the product designed, manufactured, assembled, packed, processed and/or labelled by subcontracting, the FPC of the subcontractor may be taken into account, where appropriate for the product in question.
The manufacturer who subcontracts all of his activities may in no circumstances pass these responsibilities on to a subcontractor.
6.3.2.2 Equipment
6.3.2.2.1 Testing
All weighing, measuring and testing equipment shall be calibrated or verified or both and regularly inspected according to documented procedures, frequencies and criteria to ensure consistency with the monitoring and measuring requirements. All calibrated or verified equipment shall have identification in order to determine their status.
6.3.2.2.2 Manufacturing
All equipment used in the manufacturing process shall be regularly inspected and maintained to ensure use, wear or failure does not cause inconsistency in the manufacturing process. Inspections and maintenance shall be carried out and recorded in accordance with the manufacturer’s written procedures and the records retained for the period defined in the manufacturer’s FPC procedures.
6.3.2.3 Raw materials and components
The specifications of all incoming raw materials and components shall be documented, as shall the inspection scheme for ensuring their compliance. In case supplied kit components are used, the constancy of performance system of the component shall be that given in the appropriate harmonized technical specification for that component.
6.3.2.4 Traceability and marking
Individual products (in case of sensor control unit) and batches (in case of sensing elements) shall be identifiable and traceable with regard to their production origin. The manufacturer shall have written procedures ensuring that processes related to affixing traceability codes and/or markings are inspected regularly.
6.3.2.5 Controls during manufacturing process
The manufacturer shall plan and carry out production under controlled conditions.
6.3.2.6 Product testing and evaluation
The manufacturer shall establish procedures to ensure that the declared performance of the characteristics is maintained. The characteristics, and the means of control, are indicated in Clauses 4 and 5.
6.3.2.7 Non-complying products
The manufacturer shall have written procedures which specify how non-complying products shall be dealt with. Any such events shall be recorded as they occur and these records shall be kept for the period defined in the manufacturer’s written procedures.
Where the product fails to satisfy the acceptance criteria, the provisions for non-complying products shall apply, the necessary corrective action(s) shall immediately be taken and the products or batches not complying shall be isolated and properly identified.
Once the fault has been corrected, the test or verification in question shall be repeated.
The results of controls and tests shall be recorded. The product description, date of manufacture, test method adopted, test results and acceptance criteria shall be entered in the records under the signature of the person responsible for the control/test.
With regard to any control result not meeting the requirements of this European standard, the corrective measures taken to rectify the situation (e.g. a further test carried out, modification of manufacturing process, throwing away or putting right of product) shall be indicated in the records.
6.3.2.8 Corrective action
The manufacturer shall have documented procedures that instigate action to eliminate the cause of non¬conformities in order to prevent recurrence.
6.3.2.9 Handling, storage and packaging
The manufacturer shall have procedures providing methods of product handling and shall provide suitable storage areas preventing damage or deterioration.
6.3.3 Product specific requirements
The FPC system shall:
— address this European Standard, and
— ensure that the products placed on the market comply with the declaration of performance.
The FPC system shall include a product specific test plan, which identifies procedures to demonstrate compliance of the product at appropriate stages, i.e.:
a) the controls and tests to be carried out prior to and/or during manufacture according to a frequency laid down in the test plan, and/or
b) the verifications and tests to be carried out on finished products according to a frequency laid down in the test plan
If the manufacturer uses only finished products, the operations under b) shall lead to an equivalent level of conformity of the product as if FPC had been carried out during the production.
If the manufacturer carries out parts of the production himself, the operations under b) may be reduced and partly replaced by operations under a). Generally, the more parts of the production that are carried out by the manufacturer, the more operations under b) may be replaced by operations under a).
In any case the operation shall lead to an equivalent level of conformity of the product as if FPC had been carried out during the production.
NOTE Depending on the specific case, it can be necessary to carry out the operations referred to under a) and b), only the operations under a) or only those under b).
The operations under a) centre as much on the intermediate states of the product as on manufacturing machines and their adjustment, and measuring equipment etc. These controls and tests and their frequency shall be chosen based on product type and composition, the manufacturing process and its complexity, the sensitivity of product features to variations in manufacturing parameters etc.
The manufacturer shall establish and maintain records that provide evidence that the production has been sampled and tested. These records shall show clearly whether the production has satisfied the defined acceptance criteria and shall be available for at least three years.
7.2 Marking of functional units
Each functional unit shall be marked with the following information:
a) the number and date of this standard (i.e. EN 54-22:2015);
b) name or trademark of the manufacturer or supplier;
c) model designation (type or number);
d) environment group (I, II or III);
e) the wiring terminal designations (if applicable);
Arrangement of the sensing element in the fire test room A.1 General
This annex specifies the arrangement of the sensing element for the fire tests (see 5.5.1). A.2 Fire test room arrangement
A part of sensing element shall be mounted as shown in Figure A.1 in a fire test room as described in EN 54¬7:2000.
11m
Key
A Starting point of the sensing element
B Location of the temperature probe (distance from ceiling (50 ± 10) mm) C Location of the test fire (centre of the floor) D In case of a multipoint sensing element: location of one sensor E Thermal insulation in case of a fire test room exceeding the minimum dimensions
NOTE The inner rectangle shows the arrangement of sensing element in the smallest permissible size of the fire test room. The outer rectangle shows the arrangement of sensing element in the largest permissible size of the fire test room.