limitation requirements specified above shall be submitted with the
calculations required by the paragraph entitled "Design Data." The data
submitted under the paragraph entitled "Test Reports" shall clearly
indicate the compatibility of the detectors with the control panel provided
and the maximum number of detectors permitted per zone.] Malfunction of
the electrical circuits to the detector or its control or power units shall
result in the operation of the system trouble signals. Equip each detector
with a visible indicator lamp that flashes when the detector is in the
normal standby mode and glows continuously when the detector is activated.
[Provide remote indicator lamps for each detector that is concealed from
view.] Provide plug-in type detectors with tab-lock or twist-lock, quick
disconnect head and separate base in which the detector base contains screw
terminals for making all wiring connections. Detector head shall be
removable from its base without disconnecting any wires. Removal of
detector head from its base shall cause activation of system trouble
signals. Provide each detector with an integral screen to prevent entrance
of insects into the detection chamber(s).
2.8.1
Ionization Detectors
Multiple chamber type which is responsive to both visible and invisible
particles of combustion. Detectors shall not be susceptible to operation
by changes in relative humidity.
2.8.2
Photoelectric Detectors
Operate on a multiple cell concept using an infra-red light-emitting diode
(LED) light source.
2.8.3
Detector Spacing and Location
NFPA 72, the manufacturer's recommendations and the requirements stated
herein, however, in no case shall spacing exceed 9 by 9 meters 30 by 30 feet
per detector, and 9 linear meters 30 lineal feet per detector along
corridors. Detectors shall not be placed closer than [1] [1 1/2] meters
[3] [5] feet from any air discharge or return grille, nor closer than 305 mm
12 inches to any part of any lighting fixture.
[2.9
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NOTE: Specify UV-IR detectors for unroofed truck or
rail car loading/unloading facilities when automatic
activation is required.
**************************************************************************
Flame detectors shall operate on the dual spectrum ultraviolet-infrared
(UV-IR) principle. Detector shall employ a solar-blind UV sensor with a
high signal-to-noise ratio, and a narrow band IR sensor. Detector logic
shall require UV and IR signals to be present, in the proper ratio or
signature as emitted by a hydrocarbon fire, before the detector initiates
an alarm. [Detectors shall respond within 5 seconds to a JP-4 fire 3 meters
10 feet square, 46 meters 150 feet from the detector.] Detector shall not
be activated by non-fire sources such as continuous or intermittent direct
or reflected solar radiation, arc-welding, lightning, radiant heat, x-rays,
artificial lighting, radio transmissions, and normal jet engine functions.
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
SECTION 13958N
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