CM4 Four-Point Continuous Monitor
CM4 Technical Manual
3-4
3.3.3 Sample Transport Time
Although transport times are very short (<40 seconds), you should
install the monitor in a location central to all four points to achieve equal
sample transport times during monitoring. The shorter the sample
line, the shorter the response time. If monitoring a critical point, it
may be desirable to place the instrument near that critical point to
reduce sample transport time for that location. See
for
transport times.
3.3.4 Instrument Dimensions
Instrument dimensions are important factors in instrument placement.
For the basic tabletop configuration, the dimensions are approximately
9.187 inches (23.3 cm) high. See
and mounting dimension for the optional wall and rack mount
configurations. The CM4 is 17 inches (43 cm) wide and 17-3/4 inches
(45 cm) in depth. The CM4 weighs about 50 pounds (23 kg).
3.4 Sample Locations
Before installing the CM4, evaluate the sampling locations to determine
if excessive dust or moisture are present. Use an external filter at the
end of all sample lines. See
for selection of appropriate
filter type for the target gas. Dust may be a result of construction as
well as manufacturing activities. Moisture may occur from rain entering
a line at an outdoor sampling location or from condensation caused
by temperature fluctuations. Water condensation in the sample lines
could cause false alarms.
NOTE:
Variables such as air flow, the molecular weight and temperature
of the sample gas, and the physical conditions of the areas being
monitored influence the placement of the sampling locations. You
may need to consult your company industrial hygiene or safety
officer before installing sample lines to determine your company’s
policy related to sampling locations and monitoring of the desired
sample gas.
3.4.1 Sample Line Particulate Filter Use
Refer to
to install sample line filter and to determine if a
filter can be used at the location.
3.4.2 Special Considerations for Positive
Pressure
A transducer inside the CM4 can detect when positive pressure
is present to effectively monitor positive pressure locations. An
operational message indicates when a point has detected positive
pressure.
3.5 Configuring for Mounting Method
The CM4 is factory configured for tabletop use. Rack mounting
and wall mounting require additional procedures for mounting and
connections of cable and tubing.
For optional configurations, Honeywell Analytics supplies the following
installation drawings:
• Wall mount kit: drawing #874014-I
• Rack mount kit: drawing #874013-I (customer-supplied rack)
• Rack enclosure: drawing #874550-I (MDA-supplied cabinet)
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