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

17

STARTING UP

The following steps must be carried out when commissioning the analyzer:
 Before starting the equipment for the first time, check that the electrical connections and the gas connec-
tions have been executed as requested. The voltage indicated on the type plate must correspond to the
mains supply.
 Deviations of the zero point of the analog display can be corrected by using the adjusting screw below
the digital display. To do this, the housing of the analyzer must be opened in a voltage-free state.
 Set the measuring range selector switch to 30 % and switch on the analyzer using the external main switch.
The display of the analyzer now shows an O

The warm-up phase of the analyzer is indicated by the permanently lit heating control LED
panel (Figure 1). After about 30 minutes the PMA50 EX has reached its operating temperature. This is indicated
by a flashing of the heating control LED
Calibrate the analyzer after starting-up. The temperature is stable after approx. 3 hours.
Now, the analyzer can be calibrated according to the following instructions. To check
how stable the status of the analyzer is, start another calibration after 24 hours!
Note
18

CALIBRATION

Before carrying out calibration work, the plant- and process-specific safety measures must be observed!
The accuracy of the measurement depends on the accuracy of the analyzer calibration.
The linearity of the measuring ranges allows a two-point calibration, that of the zero point and the measuring
range end value.
Recommendation for calibration intervals: The weekly calibration of the analyzer guarantees the required
accuracy of the measurements. Due to the direct proportional dependence of the oxygen display to the
barometric or process pressure, the calibration interval can be reduced accordingly to one day in case of large
pressure fluctuations.
Basically, carry out the calibration under measuring conditions, i.e. keeping the flow rate,
the room temperature and the barometric pressure conditions constant. Avoid vibra-
tions!
Note
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value of less than 21 % in ambient air.
2
13 (see Figure 1).
PMA 50 EX | 1.01.04
13 on the front
23