The instruments have to be tested regularly, and therefore the gas mixture has to be applied to the gas detector
or the gas measurement instrument with a determined flow.
This station may be used, for instance, for the above ground test with 10 ppm test gas or the weekly (working days)
check with 1 Vol.% CH4 or 2.2 Vol.% CH4 (50% LEL).
With this station the most commonly used gases can remain connected permanently.