specific conditions such as equipment layout within
protected areas, hazard location area, type of
hazard, class, and group. Remote test capability
should be used only when required by governing
regulations or when sensors are installed in hard to
reach areas. Within the U.S., the FCC regulates the
operating frequencies of all microwave sensors.
Other countries have their own frequencies. The
designer must determine what frequency is allowed at
the project site.
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Exterior sensor housings shall provide protection against windblown dust,
rain, splashing water, and hose directed water. Sensors shall be undamaged
from the formation of ice on the enclosure.
2.7.1
Bistatic Microwave Sensor
The bistatic microwave sensor shall consist of a separate transmitter and
receiver. The sensor shall detect changes in the received microwave signal
caused by the movement of a standard intruder within the sensor's detection
pattern. Upon detecting such changes, the sensor shall transmit an alarm
signal to the alarm annunciation system. The sensor shall detect a
standard intruder moving perpendicular through the sensor's detection
pattern at a speed of 0.06 to 7.6 m/s 0.2 to 25 feet per second. The
sensor shall be equipped with circuitry that produces an alarm signal when
the sensor's receiver is captured by another microwave transmitter. The
sensor shall comply with 47 CFR 15, Subpart F. The sensor's coverage
pattern shall be as shown. Multiple sensors shall be able to operate in
adjacent zones without interfering with each other. The sensitivity of the
sensor shall be adjustable by controls within the sensor. The controls
shall not be accessible when the sensor housing is in place. The sensor
shall be adjustable to obtain the coverage pattern shown.
2.7.1.1
Test Indicator, Bistatic
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
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.
2.7.1.2
Remote Test, Bistatic
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.
2.7.2
Monostatic Microwave Sensor
The monostatic microwave sensor shall consist of an integrated transceiver.
The sensor shall detect changes in the received microwave signal caused by
the movement of a standard intruder within the sensor's detection pattern.
SECTION 13720A
Page 61
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