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MAINTENANCE
8.1.3
FAULT FINDING
If the detector reports a fault, then the indicators along with the 4-20mA, video or network
interfaces can be used to diagnose the cause. Refer to Section 5 'Operation' for more details and
Appendix B for information on video overlay messages.
The most likely fault is a dirty or obscured window. To clear the fault, clean the window and
manually activate the window test using the walk-test input or the walk-test tool. When the
window test has finished the fault should be cleared.
All other faults cannot be rectified on site and the detector needs to be replaced.
8.1.4
WALK TEST AND WINDOW TEST (OPM)
The FV300 FlameVision detectors have a built in alarm and window test facility. By flashing
lamps built into the detector that radiate IR, a simulated flame signal can be produced. This signal
is reflected back onto the array using an external mirror. The detector responds to the lamps and
will go into alarm. This is used as an alarm test to check the operation of the detector. It can be used
in any environment.
The same lamps are used to check the cleanliness of the window to monitor the optical path. In this
case the lamps are flashed in a regular pattern and the reflected signal level analysed by the array
to measure the cleanliness of the window. The window test can either operate automatically at a
regular timed interval (default 20 minutes) or can be activated at any time manually.
The alarm and window (OPM) test can be activated by using the walk-test tool, see below, the
walk-test input or by network command.
8.1.5
WT300 WALK TEST TOOL
The WT300 walk-test tool is a portable, hand-held tool that can be used in hazardous areas to
activate the alarm test, window test and reset the FV300 FlameVision detectors. It uses IR signals
to communicate with the detector to activate commands and has a range of 6m. This means the
walk-test tool can activate tests on the FV300 from the ground without needing poles or other
means to reach the detector. The WT300 is battery powered using AA cells.
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