or the test indicator shall be located within the sensor housing so that it
can only be seen when the housing is open or removed.
2.7.7
Tension Wire Fence Sensor
The tension wire fence sensor shall detect displacement or changes in
tension within the sensor wires resulting from climbing, cutting, lifting
and stepping through by a standard intruder. Upon detecting such changes,
the sensor shall transmit an alarm signal to the alarm annunciation system.
The configuration shall be as shown. The tension wires shall be double
strand barbed wire. The configuration shall be as shown. The sensor post
shall house the switches or electronics used to monitor the tension wires.
The space between tension wires shall not exceed 150 mm 6 inches.
2.7.8
Capacitance Fence Sensor
The capacitance fence sensor shall detect changes in capacitance between
the sense wires and ground as a standard intruder approaches or touches the
sensor. Upon detecting such changes in capacitance, the sensor shall
transmit an alarm signal to the alarm annunciation system. The sensor
shall consist of sense wires and a sensor signal processor. The sense
wires shall be made of stainless steel. The sense wires shall be mounted
to the fence with insulated support brackets. Ancillary mounting hardware
shall be stainless steel. 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's housing is in
place.
2.7.9
Electrical Field Disturbance Sensor
The electrical field disturbance sensor shall detect changes in the
electrical field of the sensor system when an intruder enters the detection
pattern. The system shall consist of a field generator that excites long
field wires and sense wires that are connected to a signal processor. The
signal processor of the sensor system should compare changes between each
set of field/sense wires and generate an alarm signal when the system
becomes unbalanced (i.e. an intruder enters the detection pattern). The
sensor system shall offer AC monitoring of both field and sense wires to
detect opens, shorts, and grounding and a tamper switch, and not be
hampered by rain, fog or snow.
2.7.9.1
Test Indicator, Electrical Field Disturbance Sensor
The sensor may be equipped with a test indicator if it is an integral
function of the sensor signal processor.
2.7.9.2
Remote Test, Electrical Disturbance Sensor
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.
2.7.10
Buried Ported Cable
The buried ported cable shall detect changes in the electromagnetic field
SECTION 13720A
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