establishing a series of infrared beams and detecting beam
disruptions. Transmitters shall be dual beam type and shall be
designed to emit [no perceptible] light. The beam may be
reflected by one or more mirrors before being received and
amplified. Disruption of the beam by an opaque body shall
initiate an alarm. The transmitted beam shall be uniquely
modulated to prohibit an intruder from shining another light
source into the receiver to escape detection. Provide some means
of local alarm indication on the sensor for use at the protected
zone during installation and calibration. Provide with an
indicator disabling device within the sensor enclosure. Sensor
shall consist of modulating transmitter, focusing lenses, mirrors,
demodulating receiver, power supply, and interconnecting lines.
House elements in tamper-alarmed enclosure. The receiver unit
shall provide an alarm relay with contacts capable of carrying 2
amperes at 120 volts AC minimum. The protective beam shall be
focused in a straight line. The installed beam distance from
transmitter to receiver shall not exceed 80 percent of the
manufacturer's maximum recommended rating. Mirrors may be used to
extend the beam or to establish a network of beams. Each mirror
used shall derate the maximum system range by no more than 50
percent. Mirrors and photoelectric sources used in outdoor
applications shall have self-heating capability to eliminate
condensation and shall be housed in weatherproof enclosures. The
system shall utilize automatic gain control or be provided with
sensitivity adjustments to allow for various beam lengths.
Controls shall be inaccessible to operating personnel. With
controls set at approximately midrange, the system shall initiate
an alarm whenever the beam is interrupted. Test the system by
walking through the beam. Systems that use multiple beams to
establish a fence shall be tested by attempting to crawl under and
jump through and over the beams. Systems shall provide cutoffs of
at least [90] [_____] percent to handle a high percentage of light
cutoff prior to initiating an alarm. Sensor shall have RFI
immunity.
2.4.12.3
Duress Alarms
UL 639.
a.
Hardwire duress alarms: Install at points within the protected
area as indicated. Alarms shall be capable of being secretly
activated by the foot or hand of an average adult in both standing
and seated positions. Alarms shall not be visible or audible from
the sensor. The alarm signal shall lock-in upon activation until
manually reset with a key or similar device and shall be readily
identifiable by the IDS. Sensors shall be easy to operate and
designed to minimize the possibility of accidental activation.
Hardwire duress alarms shall be rated for a minimum lifetime of
50,000 operations. Securely mount sensors in rugged,
corrosion-resistant housing. Duress alarms shall be [annunciated
to be clearly distinguishable from other intrusion detection
alarms at the control communicator] [silent at the reporting
location and clearly distinguishable from intrusion detection
alarms at the central monitoring station].
b.
Radio frequency duress alarms: Duress alarms shall consist of a
compact and lightweight transmitter enclosed in a case that can be
easily worn at the waist on a belt. Transmitter shall have a
SECTION 13702N
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