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GenTwo® PMA1000 V2.4 | 1.00.00
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11.3.2 Example: AutoZero with zero gas (N
2
)
Fig. 87: AutoZero with gas cylinder for zero gas (N
2
)
A compressed gas, e.g. N
2
cylinder gas, is used as zero gas. Solenoid valve Y7 connects the
process gas input and output during calibration, Y0 is used to supply zero gas.
Note
In all cases of test gas application, care must be taken to ensure that
no under- or overpressure builds up in the process gas flow during
calibration, which could possibly lead to a pressure surge after
switching back Y7 and damage sensitive components of the analyzer.
Test gases must always be fed in at a suitable minimum inlet pressure
and the permissible flow range of approx. 25 to max. 60 Nl/h must be
set and monitored using a needle valve and flow meter.
In menu M5/S1, the AutoCal procedure for the device channel nominated for auto-calibra-
tion can be triggered manually on the analyzer, provided an AutoCal interval has not alrea-
dy been activated at that moment for the set times.
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