CM4 Four-Point Continuous Monitor
CM4 Technical Manual
3-3
3.2 Components and Connections for Installation
All of the sample line fittings and most electrical terminals for installing
the CM4 are at the back of the instrument.
RELAY WIRING
COM
LOW-VOLTAGE
WIRING
4
3
2
1
7
5
6
8
9
Printer
3
3
3 3
Figure 3-1: CM4 Back Panel
Legend
1
Sample inlets and exhaust
6
COM port
2
Fuse
7
Printer port
3
Line power in
8
Current loop knockout
4
Power switch
9
Serial number label
5
Alarm wire panel knockouts
3.3 Surveying the Installation Site
A survey of the site helps you make important decisions before
installing your CM4. Topics in this section assist you with appropriate
placement of the CM4 and in determining if you have special filtering
needs at the sampling location. The site should:
• Be remote from the monitored location, not sharing the
atmosphere
• Have sufficient ventilation for cabinet cooling
• Have power available
• Be indoors in an area that is not subject to wide variations
in temperature (not greater than gradients of 25°C per hour)
and humidity
NOTE:
The specified humidity is 20-80% RH and a temperature
between 10°C to 40°C.
3.3.1 Placement of the CM4
Install the CM4 in an environmentally-protected setting remote from
the manufacturing or storage locations that it monitors.
Operators can place the CM4 up to 300 feet (90 m) from monitoring
points to monitor gas concentrations in an area removed from the
location where gas may actually be leaking.
3.3.2 Exposure to Dust and Humidity
Exposure to corrosive gases or materials, excess moisture, dust
and other unusual environmental conditions could seriously
hamper the instrument’s monitoring ability and could damage the
instrument.
Always allow room behind the CM4 for ventilation and servicing.
See the installation drawing #874000-I (included with the CM4)
for requirements.
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