protection and detection systems. The Contractor shall submit the
qualifications, with verification of experience and license number, for
this engineer.
1.4
DELIVERY AND STORAGE
All equipment delivered and placed in storage shall be protected from the
weather, humidity and temperature variations, dirt, dust, and other
1.5
SYSTEM OPERATION
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NOTE: Radio link supervision may be by periodic
reporting of radio fire alarm transmitters or by
periodic polling of all transmitters by the radio
fire alarm receiver. The total number of
transmitters on any one frequency and their polling
rate in a two-way system must be determined and
checked to ensure code compliance. The following
definitions are given to help clarify the use of the
words transmitter and receiver in this specification.
1. "Fire Alarm Transmitter" refers to any device
that transmits a fire alarm message back to the fire
alarm receiver at the alarm monitoring station.
2. "Radio Transmitter" is an electronic device that
generates a coded RF signal.
3. "Radio Fire Alarm Transmitter" refers to a
device that uses radio signals to transmit a fire
alarm message back to the alarm monitoring station.
The radio fire alarm transmitter may operate with
either one-way or two-way data transmission. For
one-way data transmission, the radio fire alarm
transmitter would incorporate a radio transmitter,
antenna, cables, power supply, message encoder, and
possibly an interface circuit.
a. The radio fire alarm transmitter generates and
sends a coded alarm when an alarm is received at the
transmitter. The signal is received at the radio
fire alarm receiver and an alarm is given.
b. Radio fire alarm transmitters that use two-way
data transmissions have all the same components as
the one-way system, but, in addition, they have a
receiver and controller. They operate by waiting
for the radio fire alarm receiver to send them a
radio signal to report. The radio fire alarm
transmitter then sends back a signal reporting any
alarms. Another method involves two-way radio
transmission systems which transmit signals as soon
as they are received.
4. "Fire Alarm Receivers" refer to equipment that
receives fire alarm messages from one or more fire
alarm transmitters.
SECTION 13852A
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