Detectors shall contain a visible indicator LED that shows when the unit
is in alarm condition. Detectors shall not be adversely affected by
vibration or pressure. Heat detectors shall connect to a control panel IDC
and shall be [non-restorable] [self restorable].
2.5.4
Flame Detectors
**************************************************************************
NOTE: Modify these paragraphs as necessary to
indicate that detectors placed in an explosive
environment will be approved for use in the
appropriate class, division, and group environment
as defined in NFPA 70 and as shown on drawings.
**************************************************************************
The detectors shall comply with FM P7825a. The detectors shall be
sensitive to the micron range best suited for their intended use. The
detectors shall operate over electrically supervised wiring circuits and
the loss of power to the detector shall result in a trouble signal. A
self-test feature shall be provided for each detector to be individually
tested.
2.5.4.1
Infrared (IR) Single Frequency Flame Detector
**************************************************************************
NOTE: The single frequency IR flame detector has
the advantage of a fast response and is moderately
sensitive. Its disadvantages are being affected by
temperature extremes and being subject to false
alarms from a myriad of IR sources.
**************************************************************************
The detector shall be sensitive in the range of [_____] to [_____]
micrometers only.
2.5.4.2
Infrared (IR) Dual Frequency Flame Detector
**************************************************************************
NOTE: The IR dual frequency flame detector has the
advantages of a moderately fast response, moderate
sensitivity, and a lower false alarm rate. Its
disadvantage is being affected by temperature
extremes.
**************************************************************************
The IR detector shall consist of two or more IR sensors, each selected for
a different IR frequency. The primary sensor shall be sensitive in the
range of [_____] to [_____] micrometers only. Secondary sensors are tuned
to different IR wavelengths to null out the effect of black body radiation
to the primary sensor.
2.5.4.3
Ultraviolet (UV) Flame Detectors
**************************************************************************
NOTE: Ultraviolet (UV) flame detectors can be set
to respond accurately to UV wavelength light
produced by flame from both indoors and outdoors.
UV flame detectors operate on the Geiger-Muller
principle. These gas-filled vacuum tubes respond in
SECTION 13850A
Page 21
Previous Page
