Commissioning
7.4 Introduction of reference gas
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Compact Operating Instructions, 05/2018, A5E31805656-06
77
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 pur
ged during operation with corrosive gases.
Introduction of reference gas
7.4.1
General information on reference gas
Selection of the reference gas
In an analyzer module without physically suppressed zero point, i.e. with characteristic initial
value of zero, use nitrogen as the reference gas (purity 4.6).
In an analyzer module with a physically suppressed zero point, use appropriate reference
gas. The concentration of the reference gas generally corresponds to the characteristic initial
value or, in special cases, also the full-scale value or intermediate values.
In order to compensate for interference, the reference gas compartment can be subjected to
the purified sample gas of the measured component (absorber mode) or gas out of the
cylinder, which corresponds to the average interference gas composition.
Set the flow of sample gas and reference gas to the same level.
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