Interference Gases/Zero Point Error; Checking The Sample Gas And Reference Gas Path For Leakage - Siemens SIPROCESS GA700 Operating Instructions Manual

Note
Gas supply
The gas supply of the reduced flow-type reference compartment must have a pressure of 2000
to 4000 hPa (abs.).
Following maintenance or service measures on the analyzer section or gas path, perform a
leak test again.
Introducing reference gas
Always introduce the reference gas before beginning the measurement. Depending on the
length of the analysis chamber, at least two hours must pass before the start of the
measurement at a reduced flow. Only then is the measurement signal stable. If there is a
temporary interruption of the measurement, reference gas should always flow.
Compressed gas cylinder
If you remove the reference gas for a reduced-flow reference gas compartment of a
compressed gas cylinder, purge the reference gas line before commissioning. You then need
to check the line for leaks, because leakage losses are often greater than the reference gas
consumption.
Checking the flow
● Introducing reference gas
● Lay a hose with an inner diameter of 4 mm from the reference gas outlet into a beaker filled
with water. The gas must escape slowly (approx. 1 bubble per second).
9.4.3

Interference gases/zero point error

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.
9.4.4

Checking the sample gas and reference gas path for leakage

Analyzer modules with pipes and hoses
1. Close the sample gas/reference gas outlet.
2. Pressurize the sample gas/reference gas path with overpressure of 100 hPa.
3. Wait for approximately 1 minute until the sample gas/reference gas reaches the ambient
temperature.
Rack-mounted device
Operating Instructions, 05/2015, A5E31874006-03
Commissioning
9.4 ULTRAMAT 7
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