Filter
Top Products
Instruction Manual
IM-106-5500, Original Issue
August 2005
CCO 5500
2-4
1. The site must be accessible at both sides of the duct for servicing the
transmitter and receiver.
2. The site should be as free from extremes of temperature and vibration
as possible - permissible ambient temperature range -4
o
F to 158
o
F
(-20
o
C to +70
o
C).
3. Flue gas temperatures should not exceed 572
o
F (300
o
C) at the point of
measurement - at higher temperatures instrument accuracy will
deteriorate.
4. There must be an uninterrupted sight path available between the
transmitter and the receiver.
5. The maximum cable length allowed between the power supply and the
transmitter is 33 ft (10 m).
6. The maximum total cable length between the power supply and the
receiver is 82 ft (25 m).
See Figure 1-1 for an illustration of a typical system arrangement.
Points to Consider Path Length
• Too long [>26 ft (8 m)] - low energy available.
• Too short [<1.6 ft (0.5 m)] - optical problems.
Flue Gas Temperature
• Too low (<dewpoint) - potential water droplets.
• Too high [>662
o
F (>300
o
C)] - reduced sensitivity.
Ambient Temperature
• Too low [< -4
o
F (< -20
o
C)] - condensation on lenses.
• Too high [>158
o
F (+70
o
C)] - potential instrument problems.
Measurement Range
• Minimum range depends on acceptable measurement uncertainty,
which is 10 ppm.meters, e.g. for the level of uncertainty to be below 2%
of range, the minimum range would be 500 ppm. meters.
Note: 10 ppm CO = 12.5 mg/m
3
• For increased sensitivity (reduced uncertainty of measurement) the
path length must be maximized.
• Maximum ranges - 6000 ppm.meters.
Note: To correct ppm.meters to effective ppm, divide by the pathlength.
DUCT WORK The transmitter and receiver units are mounted on a site mounting flange,
Figure 2-1, on opposite sides of the duct. To protect operators, it is
recommended that an isolating valve is used for ducts that operate at a higher
than atmospheric pressure.
A stand-off pipe [nominal bore 3 in. (75 mm) - not supplied] should be used
between the duct and the site mounting flange. The pipe should be long
enough to clear the equipment from any duct lagging; it also helps to insulate
the equipment from any high duct temperatures.