ft by 50 ft, unless otherwise indicated.
Sensor shall have RFI
and white light immunity.
(2) Microwave sensor section: Sensor shall detect intruder
presence by transmitting electromagnetic energy into a protected
zone, receiving direct and reflected energy, and monitoring
frequency shift between transmitted and received signals. If more
than one device is used in an area, devices shall operate on
different frequencies. Provide for selective filtering by sensor
to minimize nuisance alarms due to moving metal objects such as
fan blades and venetian blinds, interference from radar, or other
sources of electronic interference. Transceivers shall consist of
a combined transmit/receive antenna and an adjustable-gain
preamplifier in a single housing. Provide transceivers with
sensitivity adjustments. Transceiver controls shall permit
adjustment of transmission range and alarm signal threshold.
Sensitivity controls shall be inaccessible to operating personnel.
Sensitivity requirements shall be met with sensitivity controls
set approximately at midrange.
(3) Additional dual technology sensor requirements: The
enclosure containing two sensor sections shall be tamper alarmed.
Both microwave and PIR sections shall activate simultaneously to
generate an alarm. Only an intrusion characterized by volumetric
motion and radiant body heat shall be detected. Sensor shall
provide some means of indicating an alarm condition during
installation and calibration. A means of disabling the indicator
shall be provided within the sensor enclosure. Sensor shall alarm
if an intruder moves within the area of protection more than 1525
mm 5 feet at a velocity of 30 mm per second 0.1 foot per second,
and one step per second, assuming 150 mm 6 inches per step.
Detection sensitivity shall be irrespective of the direction of
motion. Sensor shall also alarm at velocities faster than 30 mm
per second 0.1 foot per second, up to 3050 mm per second 10 feet
per second. Sensor shall not alarm in response to general area
thermal variations. Mount sensors [near the ceiling on
vibration-free surfaces] [as indicated]. Electronic circuitry
shall be solid state and mounted on printed circuit boards.
Sensor elements shall contain circuitry for transmitter drive,
signal processing, tamper circuitry, and power supplies.
capable of carrying 2 amperes at 100 volts DC minimum.
c.
Audio sensors: Sensors shall consist of microphones which detect
audio information and transmit signals to an audio amplifier in a
central control unit. Multiple units may be connected to a
central control unit. Audio sensors shall be designed to be
especially sensitive to generic audio intrusion signature of
[breaking glass] [splintering wood] [fracturing of cement block]
[normal voice conversation]. Sensors shall have sensitivity
adjustments which shall be inaccessible to operating personnel.
Sensitivity adjustment shall permit operating ranges up to a
maximum of [465] [_____] square meters [5000] [_____] square feet.
Sensors shall have a detection sensitivity of [unidirectional
design] [omnidirectional design]. [Audio assessment capability
shall be provided.] Sensors shall be capable of installation in a
concealed configuration and shall be inherently self-protecting.
d.
Photoelectric sensors:
Sensors shall detect intruder presence by
SECTION 13702N
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