Recommended maintenance
Page 88 FlexZone Product Guide
4. Snow removal (as required)
If the weather conditions at your site include snow falls, the fence should be kept clear of
accumulating snow. If snow accumulates against and around the fence, it will absorb and
dampen the vibrations caused by an intrusion attempt. In addition, if there is significant snow
accumulation, the snow can serve as a bridging or tunneling aid to defeat the sensor.
Preventing weather related nuisance alarms
If your FlexZone system is having a problem with nuisance alarms during inclement weather,
inspect the fence to ensure it is in good condition and there are no loose fittings that can cause
metal on metal contact. Next, connect the UCM to the processor and review the clutter and the
alarm history to try to determine the source of the nuisance alarms.
Using the SD card function
The FlexZone processor includes a microSD card slot to enable long term recording of the
sensor’s activity. The SD recording can be activated by a hardware button on the processor or by
a software control on the UCM SD Card tab. For details on the SD card operation and function
refer to the UCM online help files.
Testing the fence condition
To determine if there are any loose fittings or parts of the fence that can cause nuisance alarms in
windy weather, grip a fence panel in the middle and gently push and pull on the fence with an
increasing motion. Run a UCM magnitude response plot to record the tests, and listen for any
metal on metal contact. When you review the plot, look for any response spikes that are over the
threshold. If the shake test causes metal on metal contact, or generates response spikes over the
threshold, locate and correct the problems on the fence. This will help to prevent weather related
nuisance alarms.
Ground faults
If excessive noise is present, or becomes evident after installation, check the system’s ground
connection and examine the sensor cable installation. (Excessive noise can be identified by a high
clutter signal on a connected UCM.) In particular, ensure that there is no inadvertent ground
connection to the coaxial cable shield at a splice connection or terminator. Verify that the center
conductor and shield have not been swapped at the terminal blocks.
Note For network based systems, after completing the initial calibration
Senstar recommends running a magnitude response plot through the
Network Manager during the first periods of inclement weather. If the
weather causes an unacceptable number of nuisance alarms, you
can adjust the cable Threshold to exclude the effects of the weather.
For standalone systems that encounter an unacceptable number of
nuisance alarms during inclement weather, adjust the cable
Threshold to exclude the effects of the weather.
After adjusting the cable Threshold, retest the system to ensure that
the sensor’s detection meets your security requirements.
Note To review the recorded plot data on the SD card, connect the SD card to
the PC, start the UCM (work offline) and import the plot file(s) from the
SD card.
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