ABB EasyLine EL3000 - Page 31

EL3000 CONTINUOUS GAS ANALYZERS | CI/EL3000-EN REV. C 31
Combustion gas
DANGER
Explosion hazard
Explosion hazard due to high combustion gas flow rate.
• The maximum combustion gas flow rate specified in the
following table Combustion gas parameter on page 31
must not be up-scaled.
• For this purpose, the operator must install a suited flow
restrictor and a shut-off valve in the combustion gas line.
NOTICE
Destruction of the detector
Destruction of the detector due to overheating caused by
incorrect combustion gas.
• For a design for H
2
/He mix as a combustion gas, never use
H
2
as a combustion gas!
Note
An H
2
/He mixture may only be used if the gas analyzer has been
ordered and delivered in the intended version.
Combustion gas parameter
Quality
Hydrogen (H
2
),
Quality 5.0
H
2
/He mix
(40
%/60 %)
Inlet pressure p
e
1200 hPa, ±100 hPa
1200 hPa, ±100 hPa
Maximum combustion gas
flow
approx.
3 l/h
approx.
10 l/h
Flow restrictor in the combustion gas supply line
The combustion gas flow rate must be limited to a maximum of
10 l/h H
2
or 25 l/h H
2
/He mixture.
For this purpose, the operator has to provide suited measures
outside the gas analyzer.
ABB recommends using a bulkhead fitting with an integrated
flow restrictor to be installed in the combustion gas supply line.
This bulkhead fitting can be supplied by ABB.
• Combustion gas H
2
: order number 8329303,
• Combustion gas H
2
/He mix: order number 0769359.
Shut-off valve in the combustion gas supply line
A shut-off valve must be installed in the combustion gas supply
line to increase safety in the following operating conditions:
• when shutting down the gas analyzer,
• in case of instrument air supply failure,
• in case of a leak in the combustion gas path, inside the
gas analyzer.
This shut-off valve should be installed outside the analyzer house
in the vicinity of the combustion gas supply (cylinder, line).
ABB recommends the use of a pneumatic shut-off valve that is
actuated by the instrument air. This shut-off valve can be
supplied by ABB.
Order number 0769440.
If such a pneumatic shut-off valve cannot be installed,
precautions must be taken to monitor the overall status or the
“failure” status of the gas analyzer, see Failure of instrument air
supply on page 108.