Model 3100 Series Flame Detector (11/04)
Page: 3
Instruction Manual
2.2 Field-of-View (See Figure 2-1)
Optical Flame Detectors must be able to “see” the
fire to declare an alarm. Any obstruction between
the detector and the threat area will impair the de-
tectors ability to cover the threat area. An obstruc-
tion is anything that is not transparent to the sensor
elements of the detector. UV sensors and some
types of IR sensors cannot see through glass or plas-
tics. The 3100 series of Flame Detectors has a
120° Field of View.
When covering a large area the detectors should be
located to provide overlapping fields of view to in-
sure complete coverage.
2.3 Range
The size of fire and type of materials which consti-
tute the threat will affect the detector’s range. Dif-
ferent materials produce different amounts of the
radiant energy used by the detector to “see” the
fire. Also, the range of the detector is a function of
the fire size. Using the square of the distance rule,
if the device will detect a one sq. ft. fire at 60 feet,
to detect a 1/4 size fire (aprox. 6 sq. in.) the devices
must be within 30 feet. The Model 3100 Detector
is optimized to a 1 sq. ft. Kerosene fire at 80 feet
with the sensitivity settings set to maximum sensi-
tivity.
2.4 Environment
All optical flame detectors sense radiant energy at
some frequency or frequencies within their Field-
of-View. Any source which radiates energy at the
same frequency or frequencies used by the detector
to sense a fire may impact the detector’s ability to
“see” the fire. Care should be taken to minimize
radiant energy sources within the detectors Field-
of-View. Because of the variety of environments
and conditions, a factory trained technician or quali-
fied P.E. should be consulted before deciding on
the location of devices. The Model 3100 Detector
uses an Ultraviolet sensor (180 - 260 nanometers),
an Infrared sensor (.715 - 3.5 microns), and a Vis-
ible sensor (480 - 560 nanometers).
2.5 Configuration (See Figure 2-2)
All of the 3100 Series models have field adjustable
configuration switches located on the front face of
the detector. The factory settings are shown in
italic
text. The enhanced models have additional con-
figuration options for the Verified Fire.
2.5.1 Sensitivity
All versions have several sensitivity settings
available. The sensitivity settings are 20, 40,
60, and
80
feet. Each setting is optimized to
alarm on a 1 sq. ft. Kerosene fire within 5
seconds. Switches 1 and 2 control the sensi-
tivity.
The factory default is 80 feet. (SW1
and SW2 are off.)
Note: Different fuels emit energy at different
rates. For example; a fire involving fuel oil
does not emit energy at the same rate as gaso-
line. Consequently, the Model 3100 will be
able to respond to a gasoline fire at a little
greater distance than it will to a fuel oil fire.
Similary, a fire involving acetone will be seen
at a greater distance than one involving gaso-
line.
SW1
SW2
SW3
SW4
SW5
SW9
SW8
SW7
SW6
SW1 Shown in off position
SW2 Shown in on position
Figure 2-2: Configuration Switches
