UV flame detector shall be of the narrow band response type which operates
on radiated ultraviolet energy and shall be sensitive in the range of
[_____] to [_____] micrometers only. The cone of vision shall be 80
degrees or greater. Each detector shall be completely insensitive to light
sources in the visible frequency range.
2.5.4.4
Combination UV/IR Flame Detector
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NOTE: Combination UV/IR flame detectors have been
used both inside and outside to detect fires, but
are slower to react than individual units.
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The UV/IR detector shall provide discrimination against false alarms by
requiring both UV and IR flame detection before an alarm is sent. The UV
sensor shall be sensitive in the range of 0.185 to 0.265 micrometers only.
The IR sensor shall be sensitive in the range of [_____] to [_____]
micrometers only. Detectors shall be completely insensitive to light
sources in the visible frequency range.
2.6
NOTIFICATION APPLIANCES
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NOTE: If provided, electrically powered internally
illuminated emergency exit signs shall flash as a
visual emergency alarm in conjunction with audible
emergency alarms. EXCEPTION: Visual alarms devices
that are mounted adjacent to emergency exit signs
can be used in lieu of flashing exit signs.
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Audible appliances shall conform to the applicable requirements of UL 464.
Devices shall be connected into notification appliance circuits. Devices
shall have a separate screw terminal for each conductor. Audible
appliances shall generate a unique audible sound from other devices
provided in the building and surrounding area. Surface mounted audible
appliances shall be painted [red] [white] [_____]. Recessed audible
appliances shall be installed with a grill that is painted [red] [white]
[_____] [with a factory finish to match the surface to which it is mounted].
2.6.1
Alarm Bells
Bells shall be surface mounted with the matching mounting back box [surface
mounted] [recessed]. Bells shall be suitable for use in an electrically
supervised circuit. Bells shall be the underdome type producing a minimum
output rating of [85] [_____] dBA at 3.1 m 10 feet. Bells used in exterior
locations shall be specifically listed or approved for outdoor use and be
provided with metal housing and protective grilles. Single stroke,
electrically operated, supervised, solenoid bells shall be used for coded
applications.
2.6.2
Alarm Horns
Horns shall be surface mounted, with the matching mounting back box
[surface mounted] [recessed] [[single] [double] projector,] [grille and]
vibrating type suitable for use in an electrically supervised circuit.
Horns shall produce a sound rating of at least [85] [_____] dBA at 3.05 m
SECTION 13851A
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