Installing the Gas Analyzer 33
Checking the Seal Integrity of the Gas Feed Paths
Checking the Seal Integrity of the Gas Feed Paths
The seal integrity of the sample gas feed path and, if applicable, of the
reference gas feed path is checked ex works with a helium leak test for a
leakage rate of < 2 ´ 10
–4
hPa l/s.
We recommend that the seal integrity of the gas feed path is checked
before commissioning the instrument at the installation site, since it may
have been affected during transport of the gas analyzer (e.g. through
strong vibrations).
Requisite Material
· Pressure gauge
· Flexible tubing, length approx. 1 m
· T-piece with shut-off valve
· Air or nitrogen
ATTENTION
If the seal integrity test is to be carried out with air and if flammable gas
could be present in the sample gas feed path or is to be subsequently
introduced, the sample gas feed path must be purged with nitrogen
beforehand! The seal integrity test can be carried out with nitrogen
instead.
Checking the Seal Integrity of the Gas Feed Paths
1 Seal the outlet of the gas feed path to be tested so that it is gas-tight.
2 Connect the T-piece with the shut-off valve to the inlet of the gas feed
path to be tested by means of the flexible tubing.
3 Connect the free end of the T-piece to the pressure gauge.
4 Blow air or nitrogen through the shut-off valve until the sample gas
feed path is under a positive pressure of p
e
» 50 hPa. Maximum
positive pressure p
e
= 150 hPa.
5 Close the shutoff valve. The pressure should not change measurably
in 3 minutes. A sharp drop in pressure is an indication of a leak in the
gas feed path being tested.
6 Repeat steps 1–5 for all gas feed paths in the gas analyzer.
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