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5.2.4 Fire sensitivity (En.54/ 5.5)
5.2.4.1 Test procedure
The test consists of exposing the detectors to the radiation from test fire at known distances, d, to determine if the detectors are capable of producing an alarm signal within 30 s. The distance shall be chosen in accordance with the manufacturers specification for the intended class(es) of the detector (see 5.2.4.2)
The eight specimens shall be mounted on a support with their optical axes in the horizontal plane and at a height of 1500 mm ± 200 mm. The horizontal angle of incidence, IH, as defined in Figure 2, shall be not greater than 5°. The detectors shall be connected to supply and monitoring equipment.
The fire tray, containing n-heptane in accordance with C.1, shall be placed at a distance of 12 m from the plane of the detector sensing elements in an area where the fire will be unaffected by draughts. The area shall be free of radiation sources which may affect the response of the detectors to the test fire.
The detectors shall be shielded from radiation and shall be allowed to stabilize for at least 15 min or for a period specified by the manufacturer. The fuel shall be ignited and allowed to burn for at least 1 min. The shutter shall then be removed and the detectors exposed to the radiation from the fire for a period of 30 s. At the end of the 30 s period the detectors shall again be shielded from the fire radiation and the status of each detector recorded. If all 8 specimens are in the alarm condition then the detector shall be deemed to respond to the test fire. If one or more of the specimens has failed to respond then the detector is deemed to have failed the test.
If the manufacturer specifies class 2, the complete procedure shall be repeated with the distance between the fire and the detectors of 17 m. If the manufacturer specifies class 1, the complete procedure shall be repeated with the distance between the fire and the detectors of 17 m and 25 m.
For detectors having adjustable sensitivity the above tests shall be carried out for the extreme sensitivity settings. If the range of adjustment covers more than one sensitivity class then the tests shall be performed for settings corresponding to each of the marked classes.
5.2.4.2 Classification
The detector shall be classified according to the greatest distance at which all eight specimens respond to each fire type within the 30 s exposure. The classes shall be:
a) Class 1 if all specimens respond to test fire at distances up to and including 25 m
b) Class 2 if all specimens respond to test fire at distances up to and including 17 m
c) Class 3 if all specimens respond to test fire at a distance of 12 m
If any specimen fails to respond to test fire at a distance of 12 m, it shall not be classified. At each tested setting for which the manufacturer claims compliance with this standard, the detector response shall be classified as Class 1, 2 or 3.
5.2.4.3 Requirements
The detector shall attain classification 1, 2 or 3 (see 5.2.4.2). For detectors having adjustable sensitivity, and for which the adjustment covers more than one sensitivity class, the sensitivity class determined at each setting shall correspond to that marked on the detector.
Figure 2 - Fire sensitivity test apparatus
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Key
1 Supply and monitoring equipment 4 Test fire
2 Screen to be removed during test 5 Detectors
3 Horizontal optical axis of detectors |
5.2.5 Dazzling (En.54/ 5.6)
5.2.5.1 Test procedure and apparatus
5.2.5.1.1 General
The test procedure and apparatus described in 5.2.5.1.2 to 5.2.5.1.6 and annex D shall be used.
5.2.5.1.2 State of the specimen during conditioning
The specimen shall be mounted on the optical bench. It shall be operational condition.
5.2.5.1.3 Conditioning
The specimen shall be allowed to stabilize for 1 h in a darkened room. The specimen shall then be exposed to the light source as follows:
a) incandescent light (modulated) 20 times 1 s on, 1 s off, followed by
b) incandescent light (continuous) 2 h
Modulation of the lamps shall be achieved by switching on and off the electrical supply.
5.2.5.1.4 Measurements during conditioning
The specimen shall be monitored to detect any alarm or fault signal during conditioning.
5.2.5.1.5 Final measurement (light source on)
Immediately after the continuous exposure (see 5.2.5.1.3(b)), and with the light source still on, the response point shall be determined in accordance with 5.1.3. The greater of the response points measured in this test and that measured for the same specimen in the reproducibility test shall be designated Dmax and the lesser shall be designated Dmin.
5.2.5.1.6 Final measurement (light source off)
Immediately after the completion of the measurement in 5.2.5.1.5 the light source shall be switched off and the specimen allowed to recover for a period of 5 min. At the end of the recovery period the response point shall be determined in accordance with 5.1.3. The greater of the response points measured in this test and that measured for the same specimen in the reproducibility test shall be designated Dmax and the lesser shall be designated Dmin.
5.2.5.2 Requirements
No alarm or fault signals shall be given during the exposures a) and b) of 5.2.5.1.3.
The ratio Dmax/Dmin determined in 5.2.5.1.5 shall not be greater than 1,26.
The ratio Dmax/Dmin determined in 5.2.5.1.6 shall not be greater than 1,14.
5.2.6 High voltage test (IEC60098-504/5)
5.2.6.1 Test procedure
5.2.6.1.1 Apply the voltages as specified in Table 2, alternating of a frequency of 50 Hz or 60 Hz, between current carrying parts and between current-carrying parts connected and earth for 1 minute.
Table 2 - Test voltages for high voltage test
| Rated voltage: Vr(V) |
Test voltage (V) |
Vr≤ 65
65 < Vr ≤ 250
250 < Vr ≤ 500
500 < Vr ≤ 690 |
2×Vr+500
1500
2000
2500 |
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5.2.6.1.2 For equipment containing circuits in which electronic apparatus are used and the application of the test voltage is not desirable, the circuits may be removed before applying the test voltages.
5.2.6.2 Requirements
No abnormality shall be observed.
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