Reference Gas Monitoring With Pressure Switch; Zero Point Error - Siemens SIPROCESS GA700 Operating Instructions Manual

Continuous gas analysis wall-mounted device
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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 microflow sensors and
is not intended to monitor the measuring ability.
It only monitors that the reference gas pressure is at least 1 000 hPa 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. 0.2
MPa (rel.). If the sample gas pressure has to be changed by more than ±150 hPa due to
process-specific requirements, the reference gas pressure also has to be changed by the
same amount. Only then is sufficient 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.
Checking pressure switch for function
1. Increase the reference gas pressure until the pressure switch is triggered, meaning that
the switch contact opens.
2. Please ensure that the reference gas pressure is not more than 2 000 hPa above the
sample gas pressure.
The value when pressure is increasing (response pressure) is always higher than the value
when pressure is decreasing (release pressure). This so-called switching hysteresis of the
pressure switch is approx. 200 hPa.
9.5

Zero point error

Note
Zero point error because of surrounding gases
Keep the ambient air of the analyzer section free from the measured gas component;
otherwise, measurement results will be affected. Gases which exhibit cross-sensitivity to the
measured gas component must also not be present in the ambient air.
Wall-mounted device
Operating Instructions, 05/2018, A5E31930403-06
Commissioning
9.5 Zero point error
111

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