M&C TechGroup PMA 10S Operator's manual - Manual (Page 19)

19
Gas sampling and gas conditioning technology 9-1.1-ME
For span calibration with M&C O
2
-analysers it is possible to abandon on special test gas mixtures
because of the measuring principle and the linear measuring ranges. Dry and clean air is suffi-
cient. For measurement concentrations > 40% O
2
a calibration with corresponding test gas could
be possibly recommandable.
17.1 ZERO CALIBRATION

Connect a flexible PVC- or FEP-hose with the pressure reducer of the N
2
-zero-gas bottle.
The pressure reducer should have an output control range of max. 0
– 1,5 bar abs..
C A U T I O N !
The outlet pressure is only allowed to be adjusted at max. 0,1 bar. Other-
wise the measuring cell of the analyser will be destroyed.

Open the bottle valve and than the closed pressure reducer outlet valve and purge the
pressure reducer and the complete hose line for approximately 5 sec. the pressure reduc-
er and the complete hose line.

Check the adjusted control pressure and reduce if necessary to ≤ 0,1bar, then shut off the
pressure reducer valve again.

Connect the hose end of the zero-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 !
Always calibrate at the flow rate that is adjusted for the measurement
too.

Wait approximately 20 – 30 sec. until the indication has stabilised.

If necessary adjust zero accurately to 0 % O
2
with a screw driver at the zero potentiometer
in the front panel

Check output signals at 0,0% O
2
:
N O T E !
If a gas mixture is analysed, the single gas components have to be checked
concerning potential cross sensitivity and regarded for zero calibration. (see
chapter 17.1.1 and 17.1.2).

Shut off pressure outlet valve and bottle valve.

Disconnect hose connection from the analyser. Schlauchverbindung am Analysator ent-
fernen.
Zero calibration is finished.
N O T E !
After zero calibration the span has to be calibrated too.
Output signal Measurement
0-1 V 0 V
0-20 mA 0 mA
4-20 mA 4 mA