standard intruder lifting, cutting, or climbing the fence. The system
shall be used in conjunction with new or existing fences to protect the
perimeter of a site. The system shall consist of an ultraviolet resistant
fiber optic transducer cable, and a microprocessor based dual zone signal
processor. The system shall be capable of monitoring different styles of
metal fabric fencing such as chain-link, expanded-metal or welded-mesh
fence. The sensor shall detect intruders by utilizing signals generated by
the minute flexing of the fiber optic transducer cable, caused by
attempting to cut, climb, or raise the fence fabric. The system shall be
capable of functioning as an integral part of a centralized control and
maintenance facility.
b. The signal processor shall analyze the signals from the fiber optic
transducer cable and shall detect minute vibrations in the fabric of the
fence. The processor shall utilize adaptive algorithms, ambient signal
compensation and selectable common-mode rejection, to discriminate between
actual, false and nuisance alarms, without lowering the probability of
detection. The processor shall identify, by type, a cut intrusion and a
climb intrusion. The sensor shall have independent adjustments and
thresholds for each type of intrusion and shall have the capability to
completely mask climb or cut alarms. Alarms caused by power failure, low
input voltage, cable fault (cable cut or high loss due to physical stress),
or internal electronic fault shall be identified as supervisory alarms.
2.7.5.1
Test Indicator, Fiber Optic Cable
The sensor may be equipped with a test indicator if it is an integral
function of the sensor signal processor.
2.7.5.2
Remote Test, Fiber Optic Cable
A remote test capability shall be provided. The remote test hardware may
be integral to the sensor or a separate piece of equipment. The remote
test shall be initiated when commanded by the alarm annunciation system.
The remote test shall excite the sensing element and associated electronics
causing an alarm signal to be transmitted to the alarm annunciation system.
The sensor stimulation generated by the remote test hardware shall
simulate a standard intruder moving within the sensor's detection pattern.
2.7.6
Passive Infrared Motion Sensor (Exterior)
a. The passive infrared motion sensor shall detect changes in the ambient
level of infrared emissions caused by the movement of a standard intruder
within the sensors's field of view. Upon detection of such changes, the
sensor shall transmit an alarm signal to the alarm annunciation system.
The sensor shall detect a change in temperature of no more than 1.1 degrees
C 2 degrees F and shall detect a standard intruder traveling within the
sensor's detection pattern at a speed of 0.2 to 15 m/s 0.6 to 50 feet/second
across 2 adjacent segments of the field of view. The sensor shall have a
detection range of at least 92 meters 300 feet. Emissions monitored by the
sensor shall be in the 8 to 14 micron range. The sensor shall be
adjustable to obtain the coverage pattern shown. The sensor shall be
equipped with a temperature compensation circuit.
b. The sensor shall be equipped with an LED walk test indicator. The walk
test indicator shall not be visible during normal operations. When
visible, the walk test indicator shall light when the sensor detects an
intruder. The sensor shall either be equipped with a manual control,
located within the sensor's housing, to enable/disable the test indicator
SECTION 13720A
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