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Commissioning
9.3 Gas preparation
9.3
Gas preparation
Sample gas and reference gas quality
Note
Gas preparation
The condensation of the sample gas in the gas path and the soiling of the parts through which
the sample gas flows can result in a measured value error or even failure of the analyzer. To
prevent this, the sample gas has to be prepared in accordance with the measuring task.
In order to keep the sample gas/reference gas free of dusts and condensate, observe the
following information:
• Position the suitable absorption filter before the device in order to filter out corrosive
components or components which interfere with measuring.
• Make sure that the sample gas does not condense in the gas preparation unit and in the
analyzer itself.
Prevent condensation of the sample gas with suitable measures, for example: Connect a
cooler or condensate separator upstream of the device. Heat the device.
We recommend installing the following devices upstream of the sample gas inlet for gas
preparation:
• Gas sampling device with filter
• Sample gas cooler
• Analyzer filter, medium pore size <10 µm
• Gas suction pump
Depending on the composition of the sample gas, you may need additional equipment such
as a wash bottle, additional filters and pressure reducers.
Ensure that gas sampling devices, gas cooling devices, condensate vessels, filters and any
connected controllers, recorders or indicators are ready to operate (see the associated
operating instructions).
In the case of toxic, corrosive and/or combustible gases, ensure the suitability for use of the
components. They must be approved for the respective application.
Note
Introduction of corrosive gases into heated devices
The device operator is responsible for the temperature control of moist corrosive gases. The
heating of the gases starts at the sample gas inlet into the analyzer module.
Heated devices must always be purged during operation with corrosive gases.
126
Operating Instructions, 07/2023, A5E31930403-AB
Wall-mounted device
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