26 AWG hard-drawn copper wire with a tensile strength of 17.8 N 4
pounds maximum interlaced throughout the opening such that no
opening between wires shall be larger than 100 mm 4 inches on
center. Terminate sensor so that attempts to cut the wire or
otherwise enlarge openings between wires shall cause an alarm.
Sensor termination shall be [concealed] [tamper protected].
2.4.12.2
Interior Volumetric (Space) Sensors
**************************************************************************
NOTE: Include a schedule of sensors on the plans
when the size of areas and pattern coverage is
different from one sensor to another.
**************************************************************************
a.
Passive infrared (PIR) sensors: Sensors shall detect intruder
presence by monitoring the level of infrared energy emitted by
objects within a protected zone. Sensor shall initiate an alarm
upon observing increased or fluctuating infrared energy caused by
the presence and motion of an intruder whose temperature is as
little as 1.6 degrees C 3 degrees F different from the background
temperature. Sensor shall be passive in nature; no transmitted
energy shall be required for detection. Sensor shall be sensitive
to infrared energy emitted at wavelengths corresponding to the
human body and other objects at ambient temperatures. Detection
pattern for wall-mounted sensors shall be 15 m by 15 m 50 ft by 50
ft, unless otherwise indicated[, and] [shall be housed in a
tamper-alarmed enclosure]. Detection pattern for ceiling-mounted
sensors shall be 6.28 rad 360 degrees, unless otherwise
indicated[, and] [shall be housed in a tamper-alarmed enclosure].
Sensor shall provide some means of indicating an alarm condition
during installation and calibration. A means of disabling the
indication 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 optimum detection range shall be [a
minimum of 10675 mm 35 feet] [as indicated]. Sensor shall not
alarm in response to general area thermal variations. Sensor
shall have RFI and white light immunity.
b.
Dual technology sensors: Provide sensor combining passive
infrared and microwave sensors designed and manufactured
specifically to be mounted in a single enclosure.
(1) Passive infrared (PIR) sensor section: Sensor shall detect
intruder presence by monitoring the level of infrared energy
emitted by objects within a protected zone. Sensor shall initiate
an alarm upon observing increased or fluctuating infrared energy
caused by the presence and motion of an intruder whose temperature
is as little as 1.6 degrees C 3 degrees F different from the
background temperature. Sensor shall be passive in nature; no
transmitting energy shall be required for detection. Sensor shall
be sensitive to infrared energy emitted at wavelengths
corresponding to the human body or other objects at ambient
temperatures. Sensor detection pattern shall be 15 m by 15 m 50
SECTION 13702N
Page 21
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