4.3
This gas can also be used to calibrate the Pm Pressure sensor.
4.2.4 Zirconia transducer low and high calibration
The low calibration gas must be a high quality certified mixture of pure background gas (usually
nitrogen N6.0) containing trace oxygen. Mixtures containing between 100 and 1000vpm
oxygen are preferred, however, lower concentrations may be used.
The high calibration gas must be pure dry air containing 209500vpm oxygen (i.e. 20.95%
volume).
4.3 Gas connections
Gas connections are made to the rear of the analyser. The actual connection depends on the
analyser variant and the sensor selection. Refer to Table 4.2 through Table 4.4.
Note, the gland plate for external autocalibration is similar to Figure 4.1, except that an
additional electrical connector (PL 8) is installed underneath the gas ports.
NOTE
Pure dry air can be used, but not if it has been passed through molecular sieve driers
since its composition may have been altered significantly.
CAUTION
It is essential that all gases supplied to zirconia transducers are filtered to 2m local
to the analyser and that great care is taken to ensure that there is no possibility of
ingress of dirt, swarf or any other kinds of particle during connection or operation.
Figure 4.1: Sample gland plate without
autocalibration
Figure 4.2: Sample gland plate with
internal autocalibration
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