ABB GAA330-M Operating Instructions Manual page 69

Adjustment of the calibration cells with test gas
GAA330-M EMISSION MONITORING SYSTEM
The calibration cells have to be checked in regular intervals with certified
test gas. First the analyzer has to be adjusted with test gas. Then the ana-
lyzer has to be purged with zero gas and the calibration cell has to be driven
into the gas path. When there is a difference between the measuring signal
resulting from the calibration cell and the nominal value from the test gas,
the current value has to be set and stored as new nominal value.
1 Start calibration process.
2 The zero gas is supplied through the gas cooler.
3 A defined purging time of 90 seconds starts to guarantee that all re-
mains of measuring gas are replaced.
4 The zero point is set.
5 The end-point gas is supplied.
6 A defined purging time of 90 seconds starts to guarantee that all re-
mains of zero gas are replaced.
7 The end point is set.
8 The calibration cell is driven into the gas path.
9 The measured value has to be compared to the nominal value of the
calibration cell and corrected if necessary.
10 The calibration cell is driven out of the gas path.
11 The solenoid valve is switched back to measuring gas.
12 A defined purging time of 90 seconds starts to guarantee that all re-
mains of end-point gas are replaced.
13 The measuring operation is restarted.
| OI/GAA330-M-EN REV. C 69