switch housing shall shroud the activating button to prevent accidental
activation. Switches shall be rated for a minimum lifetime of 50,000
operations.
2.6.4.3
Wireless
Wireless duress alarm switches shall consist of portable alarm transmitters
and permanently installed receivers. The transmitter shall be activated by
depressing a push-button located on the housing. An alarm signal shall be
transmitted to one or more receivers located within a protected zone. The
receivers shall, in-turn, transmit an alarm signal to the alarm
annunciation system. No visible or audible alarm or noise shall emanate
from the transmitter or receiver when activated. The transmitter housing
shall shroud the activating button to prevent accidental activation. The
transmitter shall be designed to be unobtrusive and still be activated in a
covert manner. Switches shall be rated for a minimum lifetime of 50,000
operations and have a range of at least 45 meters 150 feet. Wireless
switches shall be fully supervised, where the transmitter automatically
transmits (checks in) to the receiver on a regular basis to test the system
for low battery, tamper, and inactive status.
2.6.5
Security Screen
Security screens shall detect an intruder when the sensor wire is
disconnected, cut, or broken. An alarm signal shall be transmitted to the
alarm annunciation system. The sensor shall be constructed using
high-grade fiberglass screen mesh with a tefzel coated, nickel-plated,
multi-conductor circuit wire woven through the screen mesh. The frame
shall be sturdy wood or aluminum as shown. The sensor grid wires
connection to the alarm annunciation system shall be housed within a
junction box as shown. A tamper switch shall be provided to detect
attempts to remove the screen and to detect attempts to tamper with
connections and end of line resistors.
2.6.6
Vibration Sensor
**************************************************************************
NOTE: The area protected by a single sensor can be
increased by installing a steel strap grid.
**************************************************************************
The vibration sensor shall detect attempts to penetrate a structural
barrier. The vibration sensor shall detect the high frequency vibrations
generated by the use of such tools as oxyacetylene torches; oxygen lances;
high speed drills and saws; explosives, hammers and chisels to penetrate a
structure while ignoring all other mechanical vibrations. An alarm signal
shall be transmitted to the alarm annunciation system when 1 or more of
these incidents occur. The sensor shall consist of a sensor signal
processor and piezoelectric crystal sensor elements that are designed to be
rigidly mounted to the structure being protected. The sensor signal
processor may be integral with the sensor element or may be a separate
assembly. The sensor signal processor shall process the signals from the
sensor elements and provide the alarm signal to the alarm annunciation
system. The sensitivity of the sensor shall be adjustable by controls
within the sensor signal processor. The controls shall not be accessible
when the sensor signal processor housing is in place. The detection
pattern of a sensor element shall be circular with at least a 5 m 16 foot
radius on the protected structure. A factory installed hookup cable of not
less than 1.8 m 6 feet shall be included with each sensor. The mounting
SECTION 13720A
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