AO2000 CONTINUOUS GAS ANALYZERS  |  OI/AO2000-EN REV. B  23
 
 
 
Description 
Gas analyzers for the 'Safety Concept' 
Gas analyzers for the 'Safety Concept' consist of analyzer modules 
•  Limas11 IR, Uras26 (see page 28) in the version with safety cell and 
purged sample cell windows, 
•  Caldos25, Caldos27, Magnos206 (see page 30) in the version with direct 
sample chamber connection and purged thermostat room, 
each mounted in the 19-inch housing (Model AO2020) or wall-mounted 
housing (Model AO2040). 
The purge gas flow monitoring (see page 32) is a constituent part of the 
'Safety Concept', including a control and evaluation, it is fully integrated into 
the gas analyzer. 
Design 
The gas analyzer consists of the central unit (system housing with display 
and operator control unit, power supply unit and electronics module) and 
the analyzer module. 
The analyzer module is installed in the central unit or in a separate housing. 
The version satisfies the provisions of the European Directive 2014/34/EU 
(ATEX Directive). It is designed to EN 60079-15 and EN 60079-2. 
NOTE 
The Declaration of Conformity can be found on the DVD-ROM "Software 
tools and technical documentation" which is delivered together with the gas 
analyzer. 
The temperature class of the analyzer is T4. 
The measurement function of the gas analyzers was not checked for suita-
bility for influencing of other devices in hazardous areas. 
Remark: Non-flammable gas is a gas mixture with a proportion of flammable 
components which is always – therefore even in the event of an error – smaller 
than the lower explosive limit (LEL). 
Designation 
  II 3G Ex nA pyb II T4 Gc