40 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Housing purge
When does a housing purge become necessary?
A housing purge becomes necessary when the sample gas contains flamma-
ble, corrosive or toxic components.
Prerequisite for housing purge
A housing purge is possible if the system housing is protected to IP54 (with
connection box) or IP65 (without power supply). The purging gas connectors
(⅛ NPT female thread) are factory-installed based on orders.
Caldos25, Caldos27, Magnos206, Magnos28, Magnos27 analyzer modules
In gas analyzers with the Caldos25, Caldos27, Magnos206, Magnos28 and
Magnos27 analyzer modules there is a gas-tight separation of the central
unit and the analyzer. As a result, the central unit and the analyzer can be
purged both separately (in parallel) and jointly (in series).
Limas11 IR, Limas21 UV, Limas21 HW, Uras26 and ZO23 analyzer modules
In gas analyzers with the Limas11 IR, Limas21 UV, Limas21 HW, Uras26 and
ZO23 analyzer modules there is no gas-tight separation of the central unit
and the analyzer. They can therefore only be purged together. If separate
purging of the central unit and the analyzer is required, the analyzer module
must be installed in a separate system housing protected to IP54.
Fidas24 and Fidas24 NMHC analyzer modules
In gas analyzers with the Fidas24 and Fidas24 NMHC analyzer modules the
housing purge is provided in such a way that a part (approx. 600 to 700 l/h)
of the instrument air is conducted continuously through the housing as
purge air. Thus it is made sure that no ignitable gas mixture can form within
the housing in case of a leak in the combustion gas path.
NOTE
The analyzer modules Caldos25, Caldos27, Limas11 IR, Limas21 UV,
Limas21 HW, Magnos206, Magnos28, Magnos27, Uras26 and ZO23 may not
be purged in series with the analyzer module Fidas24 and Fidas24 NMHC on
account of the different requirements for the purge gas supply.
Central unit with housing purge
A central unit with no analyzer module installed can also be ordered in the
version "with housing purge". In this case, the purging gas connectors are
installed ex works in the end plate. This closes the system housing to the
rear and at the bottom instead of the analyzer module.
ATTENTION
In the case of joint purging of the central unit and analyzer, the purge gas
must first of all be conducted through the central unit and then through
the analyzer. If the flow is in the opposite direction and there are leaks in
the sample gas feed path, corrosive sample gas components can destroy
the electronic components!
An analyzer module which is used to measure corrosive sample gas com-
ponents must always be positioned last in the line!
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