Full Scale Value Calibration - M&C PMA Series Instruction Manual

After zero calibration, the full scale value must also be calibrated!
Note
18.2

FULL SCALE VALUE CALIBRATION

For oxygen concentrations of the sample gas below 30 % O
calibration. Higher concentrations ideally require a test gas corresponding to the full
scale value!
Note
Before calibrating the full scale value, always check the zero point.
The following calibration procedure has to be carried out:
 Adjust measuring range selection switch to the range in which the calibration will be carried out.
 Connect the flexible PVC or Viton tube with the bottle pressure reducer of the test gas bottle, if necessary
with ambient air or instrument air.
Warning
 First open the bottle valve, then open the closed output valve of the pressure regulator;
 Purge the pressure regulator and the tubing for about 5 seconds;
 Check adjusted control pressure and reduce to ≤ 1.1 bar abs. if necessary, then shut-off the outlet valve of
the pressure regulator again.
 Connect the free tube end of the test gas bottle connection to the gas inlet of the analyzer or, if available,
the external calibration valve;
 Open slowly the output valve of the pressure reducer in order to avoid pressure peaks;
 Set the test gas volume flow to max. 60 l/h using the needle valve of the flow meter. The volume flow of
the calibration gas should always correspond to the sample gas volume flow;
Always calibrate at the same gas flow as used for the measurement.
Note
 Wait approx. 30 seconds until the display is stable. If necessary, adjust the O
end value potentiometer
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The pressure reducer should have a maximum outlet measuring range of 0 to
1.5 bar abs. and should always be adjusted to a low outlet pressure of max.
1.1 bar abs. This protects the measuring cell against destruction due to high
pressure!
9 (Figure 1) (with a screw driver at air 20.93 %);
PMA 50 EX | 1.01.04
, dry air can be used for
2
-value of the test gas via the
2
25