Checking The Sample Gas And Reference Gas Path For Leakage - Siemens SIPROCESS GA700 Quick Start Manual

Commissioning: Preparation
7.4 ULTRAMAT 7
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).
7.4.3

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.
4. Note the pressure.
5. Wait approximately 5 minutes. Note the pressure again.
The sample gas/reference gas path is sufficiently tight if the pressure has not changed by more
than 1 hPa.*
*) The test values have been defined under the assumption that the total volume of the gas
path in the analyzer module and the connection line to the pressure measuring device is a
maximum of 80 ml.
Note
Ensure that the pressure of the introduced sample and reference gas does not exceed
3000 hPa (absolute) for a piped configuration or 1500 hPa (absolute) for a hosed configuration.
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Compact Operating Instructions, 05/2015, A5E31805656-03
Quick Start