Introduction Of Reference Gas - Siemens SIPROCESS GA700 Operating Instructions Manual

Accompanying gas (concentration 100 vol. %)
Water
Hydrogen
Since the zero point deviations are linear, it is easy to convert to lower interfering gas
concentrations.
In the case of interfering gases with a constant concentration, an interfering gas correction with
constant zero point offset in the gas to be measured can be carried out. If the concentration of
the accompanying gases changes during the oxygen measurement, a variable interfering gas
correction has to be carried out. An external concentration must be determined for each
interfering gas with a considerable zero point deviation. Its result is fed as interfering gas
concentration into the OXYMAT 7 analyzer module and the correction value is calculated
constantly.
Information on interference gas correction is available in the following operating manuals:
• Operating with the Local User Interface →Table A-2 References 1 - Operating Manuals LUI
(Page 82)
• Operation with SIMATIC PDM →Table A-3 References 2 - Operating Manuals PDM (Page 82)
8.3.3

Introduction of reference gas

Note
Composition of the reference gas
Using a contaminated reference gas may result in the reference gas throttle (capillary tube)
becoming blocked. The device is then no longer capable of measuring.
THerefore always use dust-free reference gas as far as possible (particle size < 10 μm).
• Always introduce the reference gas before beginning the measurements.
• In the case of temporary interruption of the measurements, reference gas should also always
flow. This prevents the sample gas remaining in the measuring chamber from diffusing to the
microflow sensors and possibly destroying them.
Field device
Operating Instructions, 05/2022, A5E35640463-07
Zero point deviation in
vol. % O
H O
2
H
2
Commissioning
8.3 OXYMAT 7
absolute
2
-0.03
+0.26
61