EN 54-22-2015 pdf download.Fire detection and fire alarm systems-Part 22 : Resettable line type heat detectors.
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 I 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 (L) 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.
NOTE 2 To facilitate the test procedure, it may be necessary to introduce easily detachable connections between different sections of the sensing element. It is advised to take Into account the losses introduced by these connections when determining L1.
NOTE 3 The manufacturer can specify a minimum length of sensing element that needs to be connected before and after the section of the sensing element being heated (L).
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 — L) 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 dunng 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 I K min 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 min1 until the sensor control unit annunciate an alarm.
Dunng the measurement, the airflow in the tunnel shall be maintained at a constant mass flow, equivalent to (0,8 ± 0,1) mIs 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 sensitrity 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 L,.1 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 L 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 — L) 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’ 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’ 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).EN 54-22-2015 pdf download.