Maintenance / Repair; Performance Check; Testing Detectors - Siemens OH720 Technical Manual

7 Maintenance / Repair

7.1 Performance check

7.2 Testing detectors

Building Technologies
Fire Safety
The selftest automatically subjects the detectors to an extensive electrical
performance check. Regular performance checks of the detectors are required
nonetheless. This may be done with the test gas or hot air fan depending on the
detector type.
Recommendation:
● Check the devices every year.
● Replace heavily soiled or damaged devices.
● All detectors should be replaced after 6 to 8 years of service, depending on the
ambient conditions.
To enable detector testing with test gas or with a hot air fan, the detector must be
switched to test mode.
Depending on the detector, testing may be performed with one or more of the
following accessories:
● Test gas
– REF8-S (recommended)
– REF8
● Hot air fan
● Detector tester RE7T
The following table shows which detectors may be tested with which test aids.
Detector
OH720
OP720
HI720
HI722
The flashing behavior of the alarm indicators in test mode is described in the
'Internal alarm indicator in the case of ES <10 [➙ 21]' and 'Extended flashing
behavior of alarm indicators in the case of ES ≥10 [➙ 22]' chapters.
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.
6BMaintenance / Repair
38BPerformance check
Test gas Hot air fan / detector tester
RE7T
X
X
–
–
A6V10212047_m_en_--
7
X
–
X
X
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2015-05-04