Note
Introduction of the reference gas during measurement interruptions
In the case of temporary interruption of the measurements, keep introducing the reference gas
into the analyzer module. In this way, the sample gas remaining in the sample chamber is
prevented from diusing to the microow sensors and possibly destroying them.
9.4.4 Check the reference gas ow
Procedure
1. Close the sample gas inlet.
2. Lay a hose with an internal diameter of 4 mm from the sample gas outlet into a beaker lled
with water.
3. Apply reference gas to the analyzer module.
The reference gas must exit slowly with 1to 2 bubbles per second through the water lling
(at versions with ow-type compensation circuit, 2 to 4 bubbles per second). The reference
gas ow rate is then sucient.
9.4.5 Reference gas monitoring with pressure switch
Note
No monitoring of measuring ability
The reference gas pressure switch only has a protective function for microow sensors and is not
intended to monitor the measuring ability.
It only monitors that the reference gas pressure is at least 1000hPa above the sample gas
pressure.
Note
Excessive sample gas pressure
At the time of delivery, the pressure switch for reference gas monitoring is set to approx.
2000 hPa (rel.). If you need to change the sample gas pressure by more than ±150 hPa due to
process-specic requirements, you should also change the reference gas pressure by the same
amount. Only then is sucient monitoring functionality of the pressure switch ensured.
To reset the pressure switching point of the reference gas pressure switch
• Contact the Service.
• Have the pressure switching point of the reference gas pressure switch adjusted by a Siemens
technician or someone trained for this scenario.
Commissioning
9.4OXYMAT 7 / ULTRAMAT 7: Introduction of reference gas
Wall-mounted device
Operating Instructions, 07/2023, A5E31930403-AB 129
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