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Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
3.2 Span Valve (Option)
If the span valve option is installed and a source of CO span gas from the cylinder (20-25 PSIG)
has been connected, the operator can check the span setpoint of the analyzer at any time by
pressing the
CALS
button. Zero calibration should be done, as described in Section 3.1.1,
through the sample port. Refer Figure 1-1, M300M FLOW DIAGRAM with cylinder span valve
and AUTOZERO. The pressure/vent port should be properly vented out of the analyzer area
away from the personnel.
Pressing
CALS
switches the Sample/Cal valve and allows the analyzer to draw pressurized
cylinder span gas through the pressure/span port (refer Figure 1-3). After a few minutes the CO
reading should approach to the span value. If it doesn't, the operator may press the
SPAN
button
followed by
ENTR
. The expected span gas concentration may be changed by pressing the
CONC
button.
3.3 Zero/Span Valves (Option)
If the Zero/Span Valves option has been installed the operator can check the zero and span
setpoints of the analyzer at any time by pressing the
CALZ
or
CALS
button. Refer Figure 1-1,
M300M flow diagram with Zero/Span valves and AUTOZERO. Note that both zero and span
gas source should be delivered at ambient pressure.
Pressing
CALZ
switches the Sample/Cal valve and allows the analyzer to draw zero gas through
the sample port. After a few minutes the CO reading should go to zero. If it doesn't, the operator
may press the
ZERO
button followed by
ENTR
.
CALS
works like
CALZ
except that externally supplied span gas is drawn through the analyzer.
After a few minutes the CO reading should approach the span level. If it doesn't, the operator
may press the
SPAN
button, followed by
ENTR
. The expected span gas concentration may be
changed by pressing the
CONC
button.
3-4
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