Det-Tronics X3302 Multispectrum IR Flame Detector - Manual (Page 7)

5 95-8576 9.2
INSTALLATION
NOTE
The recommended lubricant for threads and
O-rings is a silicone free grease (p/n 005003-
001) available from Det-Tronics. Under no
circumstances should a lubricant containing
silicone be used.
DETECTOR pOSITIONINg
Detectors should be positioned to provide the best
unobstructed view of the area to be protected. The
following factors should also be taken into consideration:
• Identify all high risk fire ignition sources.
• Be sure that enough detectors are used to adequately
cover the hazardous area.
• Be sure that the unit is easily accessible for cleaning
and other periodic servicing.
• Verify that all detectors in the system are properly
located and positioned so that any fire hazards are
within both the Field of View (FOV) and detection
range of the detector. The Q1201C Laser Aimer
is recommended for establishing the detector's
FOV. Refer to Appendix A for specific information
regarding detector range and FOV.
• Multispectrum IR detectors are less likely than other
detectors to false alarm to non-flame infrared sources,
as verified by the data shown in the “False Alarm
Immunity” table (page 24) in Appendix A. However,
in some instances, sustained modulation of these
sources will cause a level of desensitization resulting
in diminished detection range (refer to “Modulated
Source” table on page 24). For this reason, the
X3302 should be sited/located to avoid these
sources if there is likely to be frequent, sustained
modulation of IR sources such as those shown. It is
important to point out that these same sources have
no effect on sensitivity if there is no modulation (refer
to “Unmodulated Source” table on page 24).
• The detector should be aimed downward at least 10
to 20 degrees to allow lens openings to drain. See
Figure 1. The detector should be positioned so
that its FOv does not cover areas outside the
hazardous area.
This will minimize the possibility
of false alarms caused by activities outside the area
requiring protection.
• The detector must be mounted on a rigid surface in a
low vibration area.
• Dense fog, rain or ice can absorb IR radiation and
reduce the sensitivity of the detector. To ensure
optimum performance, be certain that the internal
optical heater is enabled on detectors that are used
in applications where snow, ice, and/condensation
are likely to occur.
• Although IR detectors are less affected by smoke
than other detectors, the X3302 should not be placed
where rising combustion products can obscure
its vision. If smoke is expected before fire, smoke
or other alternative detectors should be used in
conjunction with the X3302. For indoor applications,
if dense smoke is expected to accumulate at the
onset of a fire, mount the detector on a side wall at
least a few feet (approximately 1 meter) down from
the ceiling.
• If possible, fire tests can be conducted to verify
correct detector positioning and coverage.
• For ATEX installations, the X3302 detector housing
must be electrically connected to earth ground.
Figure 1—Detector Orientation Relative to Horizon
CENTER AXIS
OF DETECTOR
FIELD OF VIEW
CENTER AXIS
OF DETECTOR
FIELD OF VIEW
INCORRECT
CORRECT
NOTE: DETECTOR MUST ALWAYS BE AIMED
DOWNWARD AT LEAST 10 TO 20 DEGREES.
D1974