EL3060 CONTINUOUS GAS ANALYZERS | OI/EL3060-EN REV. A 117
Checking the seal integrity of the gas feed paths
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.
CAUTION
The following values apply for the test pressure and test duration after
the gas feed paths inside the gas analyzer have been opened:
Test pressure p
e
≈ 400 hPa, maximum positive pressure p
e
= 500 hPa.
Test duration 15 minutes.
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