Siemens OH720 - Maintenance and Repair; Performance Checks; Detector Testing Methods

6BMaintenance / Repair
38BPerformance check
7
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Building Technologies
A6V10212047_m_en_--
Fire Safety
2015-05-04
7 Maintenance / Repair
7.1 Performance check
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.
7.2 Testing detectors
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
Test gas
Hot air fan / detector tester
RE7T
OH720
X X
OP720
X –
HI720
– X
HI722
– X
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.