The AO2000-LS25 analyzer module is installed in the central unit housing

AO2000-LS25 Ex分析仪模块适用于可能出现由蒸汽、气体、薄雾或空气/灰尘混合物引起的爆炸性环境的区域。外部电源不允许安装在危险区域。

II 3 G Ex nA nC [op is Ga] IIC T5/T4 Gc, −20°C ≤ Tamb ≤ +55°C II 3 D Ex tc [op is Da] IIIC T100°C Dc, −20°C ≤ Tamb ≤ +55°C

The AO2000-LS25 Ex analyzer module is certified for use in hazardous areas Class 1, Division 2, Groups A, B, C and D, Temperature Code T4, ambient temperature max. +55 °C. Certificate No. 1105720.

Version in category 3G for measurement of flammable and non-flammable gases (“Safety concept”) The “safety concept” gas analyzers include:

– Uras26 and Limas11 IR in the version with safety cell and purged sample cell windows

– Magnos206, Caldos25 and Caldos27 in the version with direct sample cell connection and purged thermostat housing.

Monitoring of the purge gas flow rate is a feature of the “safety concept”. It is fully integrated into the gas analyzer, together with the controls and signal processing. The version complies with Directive 2014/34/EU (ATEX Directive). There are the following explosion protection measures in the gas analyzer:

– Non-arcing assemblies and components/non-hot components/ sealed (arcing) devices per EN 60079-15 and

– Simplified positive pressure containment per EN 60079-2

Flammable and non-flammable gases and vapors

– Under atmospheric conditions (pabs ≤ 1.1 bar, oxygen content ≤ 21 vol.%),

– Temperature class T4,

– Not potentially explosive under normal conditions,

– If potentially explosive in the event of a fault, then only seldom and briefly (in accordance with zone 2).

If the sample gas is a mixture only of oxygen and flammable gases and vapors, it must not be explosive under any conditions. As a rule this can be achieved by limiting the oxygen content to a maximum of 2 vol.%. Flammable gases and vapors that are explosive under the conditions encountered in analysis even when oxygen is excluded should be present in the mixture only in concentrations that are not critical to safety.