Special Conditions For The Measurement Of Combustion Gases - ABB EasyLine EL3000 Operating Instruction

EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D

Special conditions for the measurement of combustion gases

DANGER
Explosion hazard
Explosion hazard due to the formation of explosive gas
mixtures when measuring flammable gases and connecting
oxygen-containing test gases (such as air).
• Before connecting an oxygen-containing test gas, the gas
path must be rinsed with an inert gas, such as nitrogen.
• Observe the following safety instructions regarding
calibration.
Safety instructions regarding calibration
When measuring flammable gases, observe the following
instructions:
• When calibrating the analyzers, air must not directly be
connected as a test gas after operation with flammable
gases.
• Alternatively, where possible, use nitrogen as test gas for
calibration instead of air (for example, for zero point
calibration of Uras26 or single point calibration of
Magnos206 and Magnos28).
This must be particularly considered for automatically
controlled calibration processes, since no automatic purging
with an inert gas is possible.
Note
The version for the measurement of flammable gases and the
explosion-proof design in degree of protection II 3G (see Use in
potentially explosive atmospheres on page 10) are designed for
various variants of the gas analyzer and for different
applications.
Installation of the gas analyzer
• The pressure sensor must not be connected to the sample
gas path.
• The sample gas lines and connections must be made of
stainless steel.
• Before using the gas analyzer, corrosion resistance against
the specific sample gas must be checked.
• Only model EL3020:
– Unrestricted exchange of air with the environment must
be provided around the gas analyzer from the bottom
(floor plate) and from the rear (gas connections).
– The gas analyzer may not be placed directly on a table.
– The housing openings may not be closed.
– Spacing to adjacent built-in components to the sides
must be at least 3 cm.
• Only model EL3020 when installed in a closed cabinet:
– Sufficient ventilation of the cabinet must be provided (at
least 1 × air change per hour).
– The spacing to adjoining fittings from the bottom (floor
plate) and from the back (gas connections) must be at
least 3 cm.
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