Leak Test; Oxymat 7; Checking The Sample Gas Path For Leaks - Siemens SIPROCESS GA700 Quick Start Manual

Leak test

5.1

OXYMAT 7

5.1.1

Checking the sample gas path for leaks

The leak test is carried out with air or nitrogen at the operating temperature.
The leak rate is determined in accordance with the pressure drop method. The pressure of
the gases (air or nitrogen) enclosed in the gas line is monitored within a defined period. The
size of the pressure drop is a measure of the tightness of the gas line.
Procedure, devices with pipes
1. Close the reference gas inlet.
2. Connect the sample gas outlet to a pressure measuring instrument.
3. Apply a pressure of approximately 3000 hPa (absolute pressure) to the measuring input
4. Wait for approximately 1 minute until the sample gas that flowed in has reached the
5. Note the pressure.
6. Wait approximately 5 minutes. Note the pressure again.
The sample gas path is sufficiently leak-proof if the pressure change is < 10 hPa.
Procedure, tubed devices
1. Close the reference gas inlet and, for versions with an external reference gas pump, also
2. Connect the sample gas outlet to a pressure measuring instrument.
3. Apply a pressure of approximately 1500 hPa (absolute pressure) to the measuring input
4. Wait for approximately 1 minute until the sample gas that flowed in has reached the
5. Note the pressure.
6. Wait approximately 5 minutes. Note the pressure again.
The sample gas path is sufficiently leak-proof if the pressure change is < 28 hPa, or <
34 hPa in the case of versions with an external reference gas pump.
Quick Start
Compact Operating Instructions, 01/2013, A5E31805656-01
and seal it.
ambient temperature.
the bypass outlet.
and seal it.
ambient temperature.
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