M&C TechGroup SP2000-H320_S2 Operator's manual - Manual (Page 27)

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Gas sampling and gas conditioning technology 2-1.1.4-ME
Figure 13 Schema of test gas (calibration gas) feeding via return valve
14.2.2 OPTION 3/2-WAY BALL VALVE /3VA320
When feeding the test gas, the probe is automatically separated from the process and, therefore, only
a small quantity of test gas is necessary as no mixing with the sample gas may occur.

For the measurement operation, set the ball valve into the central position.

For the test gas feeding, turn the ball valve to the right until the limit stop.

For the measurement operation, set the ball valve into the central position again.
15 CLOSING DOWN
Before closing down, i.e. switching off the heating, the probe should be purged with inert gas or air to
avoid condensation and an eventual acidification.
16 MAINTENANCE AND REPAIR
Prior to any maintenance work, the safety instructions specific to the plant and the process have to be
observed!
It is difficult to give any recommendation as to a particular maintenance cycle. Depending on your
process conditions, a meaningful maintenance cycle has to be found for your specific application.
An indication that a probe maintenance may be necessary can be shown by a constant decrease of
the sample gas quantity in your analyse system.
Probe maintenance is essentially to be concentrated on the replacement of the filter elements and
control of the seals.