96 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Gas line connection
ATTENTION
The lines and fittings must be clean and free of any residues (e.g. particles
left over from manufacturing). Contaminants can enter the analyzer and
damage it or lead to false measurement results!
NOTES
The installation of gas connections is described in section "Installing the gas
connections" (see page 78).
Follow the manufacturer's installation instructions for the fittings! In partic-
ular, hold the male fittings (gas connections) in place when connecting the
gas lines.
Follow the manufacturer’s instructions when laying and connecting the gas
lines.
If gas lines made of stainless steel are connected to the analyzer modules,
the lines must be connected to the building-side equipotential bonding.
Never connect more than three analyzer modules in series!
Gas line connection
Connect the gas lines – made of a material appropriate for the measurement
task – to the installed gas ports.
Evacuate exhaust gases
Conduct exhaust gases directly into the atmosphere or through a line with a
large internal diameter which is as short as possible, or into a gas discharge
line. Do not conduct exhaust gases via restrictions or shut-off valves.
NOTE
Dispose of corrosive, toxic or combustible exhaust gases according to the
regulations!
Provide for sample gas line purging
Install a shut-off valve in the sample gas line (definitely recommended with
pressurized sample gas), in order to provide a means for purging the gas
line system by feeding in an inert gas, e.g. nitrogen, from the gas sampling
point.
Flowmeter installation in the reference gas line
In the Caldos25 and Uras26 analyzer modules with flowing reference gas, a
flowmeter with a needle valve must be installed in the sample gas line and in
the reference gas line, in order to adjust the flow rate in the two lines to the
optimum value.
Limas21 HW: Special information for gas line connection
• Lay heated sample gas line without any mechanical stresses and con-
nect to the sample gas inlet.
• Insulate the connection between the sample gas line and the gas analyz-
er to prevent the formation of cold bridges.
• Ensure that no sample gas can flow through the sample gas line, before
the temperature has stabilized at the set point of 180 °C!
• Lay the sample gas outlet line with a downward gradient, so that any
condensate can run off.
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