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The transmitters shall operate on a frequency of [_____] MHz.
2.1.2
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NOTE: Delete requirements for manual street boxes
if not applicable.
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Transmitters shall be powered by a combination of locally available 120
Vac, and sealed [nickel-cadium] [or] [lead-acid] type batteries requiring
no additional water. [Transmitters used in manual street box configuration
[as indicated] shall be powered by battery only.] In the event of loss of
120 Vac power, the transmitter shall automatically switch to battery
operation. The switchover shall be accomplished with no interruption of
protective service, without adversely affecting the battery-powered
capabilities, and shall cause the transmission of a trouble message in no
less than [_____] seconds. Upon restoration of ac power, transfer back to
normal ac power supply shall be automatic and the battery shall be
recharged. The converter/battery charger shall be installed within the
transmitter housing. Power supply transient filtering shall be provided.
2.1.2.1
Battery Power
The battery package shall be capable of supplying all the power
requirements for a given transmitter.
2.1.2.2
Battery Duration
Radio fire alarm transmitter standby battery capacity shall provide
sufficient power to operate the transmitter in a normal standby status for
a minimum of 60 hours and shall be capable of transmitting alarms during
that period. The capacity for battery-only powered transmitters shall be 6
months before recharging is necessary.
2.1.2.3
Battery Supervision
Each radio fire alarm transmitter shall constantly monitor and supervise
its own battery powered supply. A low-battery condition shall be reported
when battery voltage falls below 85 percent of the rated voltage.
2.1.3
Functional Requirements
2.1.3.1
Interfacing Indicators and Controls
Transmitters shall incorporate the provisions for auxiliary interconnection
to existing interior alarm systems.
2.1.3.2
Generation of Signals
Each transmitter shall be a standard design which allows the immediate
transmission of all initiated signals.
2.1.3.3
Power Output
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NOTE: The designer should provide the necessary
SECTION 13852A
Page 10
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