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Installation
Optimizing detection and avoiding false alarms
Areas to avoid:
•
Glass airlocks and glass vestibule areas.
•
Noisy kitchens
•
Residential car garages
•
Small utility rooms
•
Stairwells
•
Small bathrooms
•
Other small acoustically live rooms
•
Rooms with ultrasonic detectors
For glass break protections in such application, use Aritech
shock detectors.
Do not install in humid rooms
No glassbreak detector is hermetically sealed. Excess
moisture on the circuit board can eventually cause a short and
a false alarm.
For best false alarm immunity
•
Avoid 24-hour loop applications (perimeter loop OK).
•
Do not use where white noise, such as air compressor
noise, is present. (A blast of compressed air may cause a
false alarm).
•
Avoid rooms smaller than 3 x 3 m and rooms with multiple
noise sources such as small kitchens, glass booths, noisy
areas, garages, small bathrooms, etc.
Proper testing
The GS903N/913N is designed to detect the breaking of
framed glass mounted in an outside wall.
Testing the detector with unframed glass, broken bottles, etc.,
may not trip the detector. The GS903/913 typically does not
trip to glass breaking in the middle of the room. No burglar
breaks glass in the middle of a room, so such breaks are false
alarms.
Avoid 24-hour loop applications
The GS903N/913N is recommended for perimeter loops and is
designed to function in occupied areas. In 24-hour loop
applications, where the detector is armed all day and all night,
the false alarm technology will be pushed to its limit. Some
sounds can duplicate the points on the glassbreak pattern the
GS903/913 detect. Install the GS903/913 on a perimeter loop
which is armed whenever the door and window contacts are
armed.
Protecting occupied areas
The GS903N/913N false alarm immunity is best in rooms with
only moderate noise. For 24-hour occupied area protection,
use Aritech shock detectors.
Note:
GS903/913 may not consistently detect cracks in glass
or bullets which break through the glass. Glassbreak detectors
should always be backed up by interior protection.
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Mounting
Locate detector at least 1.2 m from noise sources (TVs,
speakers, sinks, doors, etc.) and at least 1 m away from
nearest point of glass to be protected.
Detector location should be in direct line of sight of glass to be
protected. Glassbreak detectors cannot reliably detect
breaking glass around corners or in other rooms.
Recessed
Wall or ceiling mount:
•
Drill 2.5 cm hole. (Spade bit makes cleaner hole than twist
bit. Drill 2.8 cm hole for hard woods.)
•
Run wires through hole.
•
Connect wires to terminal as shown in wiring diagrams.
Surface mount: wall mounting
Since the sound of breaking glass travels directionally out from
the broken window, the best location for mounting the detector
is on the opposite wall - assuming the glass to be protected is
within the detector's range and line of sight. The ceiling and
adjoining (side) walls are also good detector locations.
Detection is reduced with same wall mounting since the sound
must reflect off the opposite wall.
Surface mount: ceiling mounting
Mount the detector in any type of ceiling in a location which is
in direct line of sight of the windows to be protected. However,
since sound travels directionally out from the broken window, a
position of 2.4 m into the room provides better detection.
Pre-testing the detector
Put sensor in test mode:
1.
Connect 9 V battery to sensor for pre-testing to find
optimum position.
2.
Use double-stick tape provided to temporarily mount
detector in desired location.
3.
Use GS905 hand-held tester to put detector into test
mode. Set tester to "tempered glass" and hold on top of
detector. Activate tester - this will trip detector into test
mode for 1 minute. In test mode, the LED will blink
continuously. To extend test time, activate tester at least
once a minute.
Test the detector:
1.
The GS905 tester has settings for different types of glass.
Use "tempered" setting if unsure of glass type.
2.
Hold tester near surface of glass to be protected and aim
at detector. Press test button. If curtains or blinds are
present, hold the tester behind the closed curtains or
blinds. If detector is mounted on same wall as glass, point
tester at wall opposite glass.
3.
If LED stays on for four seconds, glass is within detection
range of detector (relay is activated).
4.
If LED does not stay on, reposition the detector and re-
test. (Verify adequate battery strength in tester).
P/N 15654 (ML) • REV D • ISS 23AUG17
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