ABB EL6010, Руководство оператора

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44 EL6010 Gas Analyzer in Category 2G Operator’s Manual 42/24-30 EN Rev. 1
Check Gas Path Seal Integrity
Quantity Description
1 Pressure gauge
1 Tubing, approx. 1 meter in length
1 Tee with shutoff valve
Material Required
Air or nitrogen
CAUTION!
If the seal test is to be carried out with air and there is the possibility of a
combustible gas being present in the gas paths or if a flammable gas is to be
introduced later, the gas paths should first be purged with nitrogen. Other-
wise the seal integrity test can be performed with nitrogen.
Step Action
1 Plug the outlet of the gas path to be tested.
2 Connect a hose with a tee fitted with a shutoff valve to the inlet of the
gas path to be tested.
3 Connect the free end of the tee to the pressure gauge.
Blow air or nitrogen through the shutoff valve until the sample gas path
is pressurized to a p
e
of approx. 50 hPa (= 50 mbar). Close the shutoff
valve. Maximum excess pressure p
e
= 150 hPa (= 150 mbar).
4
After opening the gas paths inside the analyzer unit:
Test pressure p
e
approx. 400 hPa, maximum excess pressure
p
e
= 500 hPa.
The pressure should not change measurably in 3 minutes. A sharp
pressure drop is a sign of a leak in the gas path being tested. 5
After opening the gas paths inside the analyzer unit:
Test period 15 minutes.
Gas Path Seal Integrity
Verification
6 Repeat steps 1 to 5 for all gas paths in the analyzer unit.