60 EasyLine EL3060 Series Commissioning Instructions
Maintenance
Inspection
Regular Inspection
Proceed in accordance with the checklist "Checking the installation" (see
page 43).
Checking the Seal Integrity of the Gas Feed Paths
The seal integrity of the sample gas feed path and, if applicable, the ref-
erence gas feed path should be checked during operation at least once a
year. The seal integrity of the gas feed path must always be checked after
the gas feed path inside the gas analyzer has been opened (see below).
If measured values are output slowly during operation (e.g. after feed in
of the test gas) or implausible measured values are obtained, a leak in
the sample gas feed path is a possible cause.
A simple procedure for testing the seal integrity of the gas feed paths is
described in the section "Checking the seal integrity of the gas feed
paths" (see page 62).
Measures Taken after Opening the Gas Paths inside the Gas Analyzer
All components of the case of the control unit and the analyzer unit
EL3060-Uras26 must be completely bolted together and locked against
rotation with the socket-head hex screws.
If the gas feed path or reference gas path inside the gas analyzer has
been opened, the seal integrity should be tested with helium at a leak
rate of < 2 ´ 10
–4
hPa l/s. As an alternative to the helium leak test, the
pressure drop method described in the section "Checking the seal integ-
rity of the gas feed paths" (see page 62) can be used. In this respect, the
test pressure is increased to p
e
» 400 hPa (= 400 mbar) and the test
duration to 15 minutes. The maximum excess pressure p
e
= 500 hPa (=
500 mbar).
Initial purging of the gas feed paths is required for the initial start-up and
each time the gas feed paths inside the gas analyzer have been opened
before the power supply is switched on. A potentially explosive mixture
gas/air mixture in the gas feed paths is thereby removed.
Purge gas for
non-flammable sample gas
Clean instrument air from non-hazardous
areas
Purge gas for
flammable sample gas
Inert gas
Purge gas volume 5x volume of the gas feed paths
Purge gas flow approx. 30 l/h
Purging time at least 3 min
The purge gas for purging the EL3060-Uras26 analyzer unit may not
contain any fractions of the sample components.
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