M&C TechGroup PMA 50 EEX Operator's manual User Manual
Page 24
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Gas sampling and gas conditioning technology
9-3.15-ME
Wait approx. 30 seconds until the display is stable. If necessary, adjust the O
2
-value of the test
gas via the span potentiometer 10 (figure 1) (with a screw driver at air 20,93%);
Check the analog output signals;
The signal to be measured can be calculated as follows:
(max. signal output - min. signal output) x Concentration [%]
Measured value =
+ min. Signal output
Measuring range span value [%]
A test gas concentration of 20,9% (air) would result in the following:
Output signal
Signal to be measured with span value
100 %
0-10 V DC
2,09 V
Output signal
Signal to be measured with span value
30 %
100 %
0-20 mA
13,95 mA
4,19 mA
4-20 mA
15,16 mA
7,35 mA
N O T E !
The mA-signal depends on the adjusted measuring range. There-
fore, it is important to check the correctness of the measuring
range chosen !
Shut the output valve of the pressure regulator and the bottle valve and separate the tube
connection to the analyser.
The span calibration has been completed.
A T T E N T I O N !
After completion of calibration set measuring range selection
switch to desired measuring range again.
The mA-output signal is dependend on the measuring range!