until manually reset with a key. The switch housing shall shroud the
activating lever to prevent accidental activation. Switches shall be rated
for a minimum lifetime of 50,000 operations.
2.2.4.2
Pushbutton
Latching pushbutton duress alarms shall be designed to be activated by
depressing a pushbutton located on the duress switch housing. No visible
or audible alarm or noise shall emanate from the switch. The switch shall
lock in the activated position until manually reset with a key. The switch
housing shall shroud the activating button to prevent accidental
activation. Switches shall be rated for a minimum lifetime of 50,000
operations.
2.2.4.3
Wireless
Wireless duress alarms shall consist of portable alarm transmitters and
permanently installed receivers. The transmitter shall be activated by
depressing a pushbutton 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 receiver shall lock
in a transmitting mode until manually reset. 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. The transmitters shall have a range of 30 m 100 feet.
2.2.5
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 from 26 gauge
insulated hard-drawn copper wire installed in a grid pattern on a wooden
frame or 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 resistor.
2.2.6
Vibration Sensor
**************************************************************************
NOTE: The area protected by a single sensor can be
increased by installing a steel strap grid as
discussed in the design manual.
**************************************************************************
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; and explosives, to penetrate a structure while ignoring
all other mechanical vibrations. An alarm signal shall be transmitted to
the alarm annunciation system. 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
SECTION 13721A
Page 21
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