ABB EasyLine EL3000 Operating Instruction page 34

34 EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
... 4 Preparation for Installation
... Fidas24
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 34
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 /He mix as a combustion gas, never use
2
H as a combustion gas!
2
Note
An H /He mixture may only be used if the gas analyzer has been
2
ordered and delivered in the intended version.
Combustion gas parameter
Quality Hydrogen (H
Quality 5.0
Inlet pressure p 1200 hPa, ±100 hPa
e
Maximum combustion gas approx. 3 l/h
flow
), H /He mix
2 2
(40 %/60 %)
1200 hPa, ±100 hPa
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 or 25 l/h H /He mixture.
2 2
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 : order number 8329303,
2
• Combustion gas H /He mix: order number 0769359.
2
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 Fidas24 –
Troubleshooting on page 174.