Wiring requirements – Det-Tronics X3300 Protect-IR Multispectrum IR Flame Detector with Pulse Output User Manual

Page 5

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should be positioned so that its field of view does not
cover areas outside the hazardous area. This will
minimize the possibility of false alarms caused by
activities outside the area requiring protection.

• For best performance, the detector should 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.

• Although IR detectors are less affected by smoke than

other detectors, the X3300 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 X3300. 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 should be conducted to verify

correct detector positioning and coverage.

WIRING REQUIREMENTS

WIRE SIZE AND TYPE

The system should be wired using a 14 to 22 gauge (1.3
to 0.5 mm2) cable. The wire size selected should be
based on the number of detectors connected, the
supply voltage and the cable length. See Table 2. In
some cases where the X3300 is replacing existing pulse

output detectors, the wiring and power supplies may not
be adequate. Consult the factory for assistance.

A minimum input voltage of 18 vdc must be present at
the X3300.

The use of shielded cable is required to protect against
interference caused by EMI and RFI. Consult the
factory if not using shielded cable.

The “B” (pulse output) and “D” (

oi driver) leads from

each detector should be shielded from the “B” and “D”
leads of all other detectors in order to prevent false
alarms resulting from crosstalk between zones. It is
recommended that the “A” and “C” leads also be
shielded to provide maximum immunity to EMI/RFI.
(See Figures 6 to 10.)

In applications where the wiring cable is installed in
conduit, the conduit should not be used for wiring to
other electrical equipment.

CAUTION

Installation of the detector and wiring should be
performed only by qualified personnel.

PROTECTION AGAINST MOISTURE DAMAGE

It is important to take proper precautions during
installation to ensure that moisture will not come in
contact with the electrical connections or components
of the system. The wiring pigtail for the X3300 is factory
sealed for easy installation onto a junction box where
electrical connections are made. The integrity of the
system regarding moisture protection must be
maintained for proper operation and is the responsibility
of the installer.

If conduit is used, drains must be installed at water
collection points to automatically drain accumulated
moisture. Conduit breathers should be installed at
upper locations to provide ventilation and allow water
vapor to escape. At least one breather should be used
with each drain.

3

95-8517

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.

B1974

Table 2—Detector Wiring Requirements

Wire Size

Minimum Voltage

Maximum Distance

AWG

at Controller

Feet

Meters

22

23 VDC

500

152

22

20.5 VDC

250

76

18

22 VDC

1000

305

18

20 VDC

500

152

16

23 VDC

2000

610

16

20.5 VDC

1000

305

14

21.5 VDC

2000

610

14

20 VDC

1000

305

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