Section 1, General Information
Chemgard Infrared Gas Monitor
The monitor uses infrared sensing technology,
allowing accurate measurement of Gas vapors
with minimum interference from other vapors.
Your Chemgard unit is factory-calibrated for a
specific Gas. It is extremely sensitive. The unit
monitors the signal and can operate three alarm
levels at a software-selectable gas concentration
values. There is also a trouble indication to alert
the operator when something is wrong with
the unit.
Identifying Your Unit
Multipoint Sequencer
The Chemgard Gas Monitor is capable of
monitoring differen
t types of gases. However,
each unit is factory-calibrated to detect one type
of Gas. Check the label inside the front door to
determine what gas your unit is designed to
detect (FIGURE 1-1). For specific guidelines on
using the RS232 function (serial communication
port), see Appendix C.
The unit monitors only one zone or location, but
your instrument may contain a Multipoint
Sequencer capable of monitoring up to four or
eight different zones or locations. To determine
the number of sampling locations your particular
unit is able to
monitor, careful
ly tilt the unit and
count the number of inlet ports at the bottom of
the case (FIGURE 1-2, 1-3 or 1-4).
Beacon
The op
tional beacon is mounted on top of the
unit (FIGURE 1-5). It is powered by the monitor’s
internal DC voltage.
End of Sample Line Filters
End of sample l
ine filters are required for proper
unit operation; they may be included in the
shipping carton.
If the end of s
ample line filters are not
included, they must be purchased.
Fig
ure 1-1. Identifying Your Unit
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