Inspection And Maintenance - ABB EL6010 Operator's Manual

Chapter 7
Inspection
Regular Inspection
Check Gas Path Seal
Integrity
Measures taken
after opening the
gas paths inside the
analyzer unit
Reseal the Wiring
Passages After
Opening
42/24-30 EN Rev. 1

Inspection and Maintenance

Perform regular inspections using the "Check the Installation" list on page 24.
Sample and reference gas path seal integrity should be examined during operation
at least once annually.
A sample gas path leak is the probable cause if erratic measurement readings
(e.g. after starting the test gas supply) or implausible measured readings occur.
A simple procedure for checking gas path seal integrity is described in the "Check
Gas Path Seal Integrity" section (see page 44).
• All parts of the housing are fully tightened and secured with set screws?
• If the sample or reference gas path inside an EL6010-... analyzer unit has been
opened, the seal integrity should be tested with helium at a leak rate of
-4
< 2 · 10 hPa l/s.
The pressure drop method, described in the "Check Gas Path Seal Integrity"
section can be used as an alternative to the helium test. To accomplish this,
increase the test pressure to a p
the test period to 15 minutes. The maximum excess pressure p
(= 500 mbar).
• Any time the gas paths are opened they must then be purged prior to connecting
the power supply. This should remove any explosive gas/air mixture in the gas
paths.
Purge gas
for a non-flammable sample gas
for a flammable sample gas
Purge gas quantity
Purge gas flow
Purge duration
The purge gas should not contain any sample gas components.
If the pressure-tight wiring passages through which the data transmission and
24-VDC connecting cables are routed into the analyzer unit's pressure-tight
cylinder have been opened, reseal the nuts using a 20-mm torque wrench;
tightening torque = 17 Nm.
EL6010 Gas Analyzer in Category 2G Operator's Manual
of approx. 400 hPa (= 400 mbar) and increase
e
Clean instrument air from areas free of
any explosion risk
Inert gas
5 times the volume of the gas paths
Approx. 30 liters / hour
At least 3 minutes
= 500 hPa
e
43