Introducing Reference Gas; Reference Gas From The Gas Cylinder; Checking The Reference Gas Flow; Sample Gas Inlet Conditions - Siemens SIPROCESS GA700 Operating Instructions Manual

Commissioning
9.2 OXYMAT 7
9.2.4

Introducing reference gas

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.
9.2.5

Reference gas from the gas cylinder

The reference gas pressure must lie at least 0.2 MPa and a maximum of 0.4 MPa above the
sample gas pressure.
Note
Reference gas line
1. Make sure that the reference gas line has the following characteristics at measuring
2. Flush the reference gas line thoroughly with reference gas before commissioning.
3. Check the reference gas line for leaks in order to avoid unnecessary losses:
9.2.6

Checking the reference gas flow

● Close the sample gas inlet.
● Apply reference gas to the analyzer module.
● Route a hose with an inner diameter of 4 mm from the sample gas outlet into a beaker
9.2.7

Sample gas inlet conditions

Prevent condensation of the sample gas in the analyzer by using appropriate measures, for
example, upstream connection of a cooler or condensation trap, or heating the analyzer.
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spans of < 2% oxygen: The smallest possible cross-section (e.g. pipe diameter 2 mm) of
metallic material (e.g. stainless steel).
– Close the valve at the gas cylinder.
– If the pressure display on the pressure reducer does not drop by more than
0.1 MPa/min, the gas connection is sufficiently tight.
In the case of two-stage pressure reducers, the inlet pressure must not drop by more
than 0.1 MPa/min.
filled with water.
The reference gas must exit slowly with 1 to 2 bubbles per second through the water
filling (2 to 4 bubbles per second for versions with flow-type compensation circuit). The
reference gas flow rate is then sufficient.
Operating Instructions, 01/2013, A5E31930403-01
Wall-mounted device