outdoor applications shall have self-heating capability to
enclosures. 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, system shall initiate
an alarm when the beam is interrupted. Test 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 beams. Systems shall provide cutoffs of at least
[90] [_____] percent to handle a high percentage of light cutoff
prior to initiating an alarm.
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NOTE: At the text below, the number of pixels
digitized depends on the application. The designer
should consider cost effectiveness as a factor since
digitizing a large number of pixels could increase
cost by a magnitude of 500 percent with little
additional actual detection capability for a
specific application.
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g.
CCTV motion detection sensors: Sensors shall accept video signals
from CCTV cameras as described in SMPTE 170M. Sensors shall
automatically monitor and process information from each camera in
succession in such a manner that it detects motion within the
camera's field of view and provides automatic visual, remote
alarms, and motion-artifacts as a result of detected motion. When
synchronizing is required, it shall be composite sync in
accordance with SMPTE 170M. Sensor processor shall detect motion
by digitizing [_____] pixels within each video scene and comparing
the gray scale of the pixels to a previously stored reference. An
alarm shall be initiated when the comparison varies by 6 percent
or more. Rate of scanning shall be [not less than one sample per
second] [adjustable]. Processor camera capacity shall be
modularly expandable and shall be a minimum of [_____]. Composite
sync connectors shall be compatible with other equipment in the
CCTV system. Video output shall automatically produce a display
which will show the individual alarming camera and the [point]
[area] where intrusion has occurred. The view of each camera
shall be manually selectable. [Point masking shall be provided to
allow exclusion of areas in constant movement.] Alarm areas on
each channel shall be individually controllable. Required sensor
power shall be 105 to 130 volts ac.
2.4.14.3
Exterior Fence Sensors
a.
Electromechanical fence sensors: Sensors shall detect human
presence by sensing mechanical vibrations or motion associated
with an intruder scaling, cutting through a standard security
chain link fence, or attempting to lift the fence fabric. Sensor
shall fully protect fence installation. Dead zones shall not
exist where an intruder can scale the fence or cut through the
fence without detection. Length of fence protected shall be
divided into [100 meter] [_____] zones. Sensors shall consist of
individually electromechanical sensing units mounted every 3045 mm
10 feet on the fence [fabric] [posts] and shall be wired in series
to a sensor zone control unit and associated power supply. Sensor
SECTION 13703N
Page 34