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–
Ensure that the area under observation has sufficient detector coverage for
all possible hazards (multiple detectors may be required) considering any
obstructions and congestion.
–
Minimize the exposure of the enclosure front cover window to contaminants
such as oil, water (deluge water, rain, and sea spray), snow, and ice. Where
the flame detector is to be mounted at a low level, avoid contamination from
equipment situated above the mounting position.
–
If dense smoke is expected to accumulate at the onset of the fire, the flame
detector should be mounted 1 - 2 m below the ceiling level where possible.
–
Ensure there is maintenance access to the flame detector (e.g., direct,
ladder or scaffold access).
–
Ensure that mounting supports are compatible with the flame detector
mounting brackets.
–
Ensure that the flame detector does not have a direct or reflected view of
any sources of flame used during normal operations, such as flare stacks.
–
Ensure that the flame detector is positioned so that it is not directly facing
hot surfaces.
All these issues are crucial to a successful installation. They should be
observed during the detailed design, construction, and commissioning phases
of the installation of a fire detection system.
3.2
Detector coverage
Software analysis of the actual detector field of view may be required to ensure
adequate coverage of the hazards. This analysis can also be used to optimize
the number of detectors and the loop configuration.
3.3
Power and cable requirements
The flame detector requires a supply voltage of 18 - 32 Vdc at the input
terminals.
Cable selection
The installation location and local regulations and standards determine the
cable specification.
Cable to be used for the installation must be selected with a temperature rating
of greater than 25 °C above the maximum ambient temperature.
Instructions for use
|
NOTICE
Risk of damage to the device!
The cable entry of the flame detector is fitted with an internal stop at the bottom
of the thread. An internal IP washer is fitted to the stop to maintain ingress
protection. This will result in threads of the cable gland being visible.
► Do not over-tighten.
The installation and local regulations and standards determine the overall cable
specification. This section specifies suitable cable characteristics to ensure
correct operation of the flame detector.
The table below shows the absolute maximums for cable lengths based on an
18 - 32 Vdc supply. Do not ground any cable shields at the detector housing.
Number of flame
Maximum power
detectors
(W)
One – heater on
12 W @ 24 Vdc
One – heater off
3 W @ 24 Vdc
Cross-sectional
American wire
2
gauge (AWG)
area (mm
)
0.5
22
1
18
1.5
16
2.5
14
|
Mounting
Maximum cable
Maximum cable
length (m) with
length (m) with
2
2
1.5 mm
conduc-
2.5 mm
conduc-
tors (12 Q/km)
tors (7 6 Q/km)
500
780
2000
3000
Typical conductor resistance per
km (3280 ft) DC Q/km at
(approximately) 20 °C
36
19
12
7.6
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