M&C PMA Series Instruction Manual page 20


Connect the hose end of the instrument air or check gas bottle connection to the gas inlet
of the analyser.

Open the pressure reducer valve slowly, to avoid pressure peaks.

Adjust the flow rate to 50 Nl/hr at the flow meter.
N O T E !

Wait approximately 20 – 30 sec. until the indication has stabilised.

If necessary adjust span accurately according to the check gas concentration with a screw
driver at the span potentiometer in the front panel. In case of air e.g. to 20,9 % O

Check output signals at 20,9% O
Output signal
0-1 V
off
0-20 mA
4-20 mA
bottle- resp. Instrument air valve resp. integrated sample gas pump.

Disconnect hose connection at the analyser.
Determination of the output signal:
– S
(S ) V resp. mA x gas concentration Vol % O
e np
upper range value Vol % O
Se = Final value, signal output
Snp = Zero, signal output

Shut off pressure reducer output valve and bottle valve. Druckreglerausgangsventil und Fla-
schenventil schließen. Disconnect hose connection at the analyser.
The span calibration is finished.
N O T E !
A T T E N T I O N
20
Always calibrate at the flow rate that is adjusted for the measurement
too.
:
2
2
If during the span calibration great variations have to be compensated
(>2% O ) at the potentiometers, a second zero and span calibration is
2
reasonable.
After finishing the calibration turn measuring selection switch to the de-
sired measuring range.
The mA-output signal is dependant on the measuring range!
PMA20 | 1.00.01
Measurement
range 100 % O
2
0,209 V
4,18 mA
7,34 mA
2
+ S
np
Measurement
range 30 % O
2
0,697 V
13,93 mA
15,15 mA
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.
2

Shut
pressure
reducer
valve and