center conductor shall have a maximum diameter of 2.20 mm 0.087 inch.
Individual cable sections shall be not greater than 15 m 50 ft in length
and shall be equipped with hermetically sealed connectors. It shall be
possible to couple together lengths of cable not greater than 15 m 50 ft
together to form maximum lengths of 305 m 1,000 ft for individual circuit
configurations. The detector shall be able to sense temperatures from 21
degrees C 70 degrees F up to 649 degrees C 1,200 degrees F and withstand
temperature extremes of from -51.1 degrees C -60 degrees F to 1,093 degrees
C 2,000 degrees F. The detector cable shall be self-restoring and thus not
require replacement of affected portions of the cable after exposure to a
high temperature such as would occur in a fire situation. It shall be
possible to supervise the cable against an open or short circuit along the
entire length of the cable such that either condition will cause a
"trouble" signal on the control panel to which it is connected. The cable
shall be fully compatible with the control panel to which it is connected.
2.21.5
Combination Ultraviolet-Infrared Flame Detector
Flame detector shall operate on the dual spectrum ultraviolet/infrared
(UV-IR) principle. Detector shall utilize a solar-blind UV sensor with a
high signal-to-noise ratio and a narrow band IR sensor. Detector logic
shall require both UV and IR signals to be present, in a predetermined
ratio or signature as emitted by a hydrocarbon fire, to put the detector in
an alarm condition. Detector shall not respond to non-fire sources of UV
or IR radiation, including intermittent or continuous solar radiation, arc
welding, lightning, radiant heat, x-ray, artificial lighting, radio
transmissions and jet engine exhaust. Detector shall have an automatic
through-the-lens self-testing feature. Malfunction of the detector
circuitry, or degradation of the sensors' lens cleanliness to the point
where the detector will not detect the design fire signature, shall cause
operation of the system trouble alarm. Logic circuits necessary for
operation of the detector shall be integral to the detector or located in a
separate flame detector control panel mounted adjacent to the foam system
control panel. Detector shall have a 120 degrees field-of-view, capable of
operating in a temperature range of -40 to 85 degrees C -40 to 186 degrees F,
and suitable for use in Class I, Division I hazardous locations. The
detector shall be listed or approved for use with the control panel to
which it is connected.
2.21.6
Nozzle System Actuation Station
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NOTE: Modify as appropriate to achieve required
operation. Assure that stations are clearly labeled
and distinguished from other fire alarm system
stations which might be similar.
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Unit shall be dual-action type requiring the lifting of a cover and pulling
of a ring to actuate. It shall not require the breaking of glass to
actuate. Unit shall be painted [lime yellow] [_____] and include a cast or
engraved label indicating [Foam Nozzle System] [_____] with operating
instructions clearly marked on the station cover. Alarm contacts shall
have a minimum rating of 120 VAC, 60 Hz, 6 amps. Contact gap distance
shall be factory set and not be field adjustable. Unit shall be compatible
with the control panel to which it is connected. Unit [shall] [shall not]
be listed or approved for use in hazardous locations.
SECTION 13955A
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