Undertaking modernization
4
Step 1: Detector modernization
4.1.3.2
Testing detectors without detector exchanger and
tester/detector tester
The point detectors are highly resistant to deceptive phenomena. This means that
optical fire detectors, for example, will recognize the immediate occurrence of
smoke (such as that which occurs during testing with test gas) as a deceptive
phenomenon and will not trigger an alarm. This is desirable in normal operation;
however, it does make testing with test gas problematical.
To enable detector testing with test gas or hot air, the detector must be switched to
test mode. Testing with test gas or hot air is performed differently on addressed
detector lines and collective detector lines.
Collective Ex detector lines
On a collective Ex detector line, the detector is not set to test mode if the detector
group is switched to 'Test' on the control panel.
Detectors on a collective Ex detector line are switched to test mode for 3 minutes in
the following cases:
Starting up and resetting the detector line
Inserting the detector
Removing the detector from the detector line and re-inserting it
To trigger a detector using test gas, normally 2…4 gas discharges at intervals of
approx. 2 seconds are required. When the detector is in test mode, activation
takes place after approximately 10 seconds.
4.1.3.3
Setting the detector zones to 'Test'
Collective Ex detector lines
Setting the respective detector zones to 'Test' on the control panel does not result
in a situation where the detectors can be activated at speed.
4.1.4
Starting up from collective mode
When starting up for the first time, you must perform the following:
1. Switch the detector line on.
2. Wait at least 30 s.
3. Read in the detector line until all the detectors installed have been recognized.
19
Building Technologies
A6V10443621_a_en_--
Fire Safety
2014-09-01
