18
Alarm test
A test fi lter with a gradient from 0% to 100% black
is supplied to carry out functional tests of the re-
fl ective beam detector.
Select the obscuration mark on the test fi lter (Fig
24) that corresponds to the obscuration set as
described in page 7.
Place the fi lter over the receiver (upper lens) of
the beam detector at the selected obscuration
threshold, taking care not to cover the the trans-
mitter optics (lower lens).
The beam should change to the alarm condi-
tion within 10 seconds and the red LED should
illuminate.* Check that the alarm condition is
registered correctly at the control panel. Re-
move the test fi lter and wait at least 30 seconds
before resetting the control panel. The red LED
should extinguish within 30 seconds of the reset
command.
*(Note: the red LED is controlled by the fi re
control panel).
Fig 24 Test fi lter with obscuration levels indicated
