34 EL3060 CONTINUOUS GAS ANALYZERS | OI/EL3060-EN REV. A
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 ref-
erence gas feed path is checked ex works with a helium leak test for a leak-
age rate of < 2 × 10
−4
hPa l/s.
We recommend that the seal integrity of the gas feed path is checked before
commissioning the gas analyzer at the installation site, since it may have
been affected during transport (e.g. through strong vibrations).
Requisite material
• Pressure gauge
• Flexible tubing, length approx. 1 m
• T-piece with shut-off valve
• Air or nitrogen
CAUTION
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, 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 to 5 for all gas feed paths in the gas analyzer.
To Next Page
Loading...
Need help?
General
