Maintenance / Repair
7
Testing detectors
61
Building Technologies
A6V10367521_h_en_--
Fire Safety
2015-02-02
7.2 Testing detectors
WARNING
Use of testers in potentially explosive atmospheres
Risk of explosion
●
Testers RE6 and RE7T must only be operated in the area not at risk.
Testing of the point detector OOH740-A9-Ex can be carried out with one or more of
the following tools:
l
Detector tester RE6
l
Test gas
– REF8-S (recommended)
– REF8
l
Hot air
– Detector tester RE7T for heat detectors
The table below shows suitable tools for testing the different sensor modes of the
point detector:
Sensor mode
Test gas
Hot air
Sensor mode 0
X
X
Sensor mode 1
–
X
Sensor mode 2
X
–
X = suitable
– = not suitable
The fire 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 differs with addressed and collective
detector lines.
Addressed detector lines (C-NET)
On addressed detector lines, the detector or detector zone can be switched to
'Test' mode on the control panel. Testing with test gas or hot air is then possible
without problems.
Collective detector lines
Detectors on a collective line are automatically switched to test mode for 3 minutes
during startup and reset. A detector that has been newly inserted (or that has been
briefly removed from the detector line and re-inserted) is therefore automatically in
test mode during the first 3 minutes.
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.
