SENTROL Application notes - Alarms BC

SENTROL
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Commercial Applications
APPLICATION
INSTALLATION
RECOMMENDED
PRODUCTS
PROTECTING DISPLAY AND JEWELRY CASES
Museum curators and retailers with glass display and jewelry cases often want the
extra protection of glassbreak sensors inside their cases. Both shock sensors and
acoustic sensors are options for such protection.
Note: Acoustic glassbreak sensors sealed within a glass box are extremely “live,”
and are vulnerable to false alarms if the case is accidentally struck by keys or other
metal objects. For this reason, acoustic sensors are appropriate only if the sensor
will be armed while the premises are not occupied.
For occupied or 24-hour protection of display cases, it is best to use shock sensors.
A frame mounted shock sensor will provide the most economical protection if
there is more than one piece of glass to protect. To prevent sensor tampering, the
glassbreak sensors must be placed inside the case.
Test the installation by rapping the protected glass farthest away from the sensors.
If the shock sensor does not trip to this rap test, it may not trip to an actual break.
Add additional sensors until at least one sensor trips on each rap test.
Note: An actual glass break generates twice as much energy to the shock sensor as
a rap test.
More than one shock sensor may be needed to protect all the glass in a display
case. If, for cosmetic reasons, this is not a viable solution, a single acoustic sensor
may be used. To protect a glass case when a room is not occupied, use an acoustic
sensor with limited range, such as the Sentrol ShatterSwitch , with its 10 ft.
(3.05 m) range. The ShatterPro II is not recommended for display cases because it
is not designed to detect the prying of the case tops.
For acoustic sensor protection, the ShatterSwitch 5725T by Sentrol will generally
protect an entire case. A 5728T with built-in reed switch can be used to detect
forced opening of the access door.
The 5115/20 shock sensor mounts directly onto the glass, and is the best choice if
only one piece of glass is to be protected. For protecting multiple glass walls in the
case, use one or more 5425 shock sensors. Use a 5426 with built-in reed switch to
detect the forced opening of the access door.
GLASSBREAK SENSORS
SENTROL
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