Siemens NXAIR Operating Instructions Manual page 424

Service information
Fig. 751: Detail view of tube connector
Instead of the tube to the compartment (7), insert the tube of the test unit (2) into the tube
connector (6) as far as it will go.
Fig. 752: Detail view of connection of test tube
Press the soft lab bottle of the test unit carefully and observe the manometer indication (1).
In the indication range from 8 to 12, the overpressure monitor must trip.
Fig. 753: Overpressure function test
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NXAIR / ≤ 40 kA
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