Starting Up; Calibration; Zero Calibration - M&C PMA Series Instruction Manual

14

STARTING UP


Check electrical connections and gas connections.

Check mechanical zero of the indication; if necessary adjust zero position by turning the slotted screw
in the pane of the indication instrument.

Turn measuring range selection switch to 30 %.

Switch on mains voltage.

The indication instrument shows 21 % O
heater control lights up permanently.

After approximately 30 min. the LED in the indication instrument starts flashing. After 12 hours the
transmitter has reached a temperature balance and the analyzer is ready for calibration.
15

CALIBRATION

Before executing the calibration, the safety instructions relating to the installment and the process must be
heeded!
The precision of the measurement depends on the precision of the analyzers calibration.
The linearity of the measuring ranges allows a two-point calibration, the zero calibration and the span cali-
bration.
A weekly calibration of the analyzer guarantees the required precision of the measurements. Due to the direct
proportional dependance of the oxygen indication to the barometric respectively process pressure, the cali-
bration interval may be decreased to one day in case there are great variations of pressure.
Always carry out a calibration under measuring conditions, i.e. keeping the flow
rate, the room temperature and the barometric pressure at a constant level. Avoid
vibrations!
N O T E !
15.1

ZERO CALIBRATION

The zero calibration of the analyzer happens with a O
have to be carried out:

Connect a flexible PVC- or FEP-hose with the pressure reducer of the N
D A N G E R !

Open the bottle valve and then the closed pressure reducer outlet valve;
22
with ambient air in the measuring cell and the LED for
2
The pressure reducer should have a maximum outlet measuring range of
0-1.5 bar abs. and should always be adjusted to a low outlet pressure of
max. 0.1 bar. This protects the measuring cell against destruction due to
high pressure!
PMA30 | 1.01.03
-free gas, e.g. Nitrogen (N
2
www.mc-techgroup.com
) 5.0. The following steps
2
-zero-gas bottle.
2