ecom-EN3
Page 27
4.2 Measurement procedure gas analysis: CO measurement
The gas channel check, called also CO measurement, is used for the technical check of gas-
fired plants in regards of safety aspects. Hereby the CO concentration in the gas channel is
measured after the flow safety device and calculated on an undiluted value (oxygen rest
content in flue gas = 0%). As the gas conditions after the flow safety device are no more
homogeneous because of the flow in of secondary air and consequently the core stream
measurement can be erratic, the analysis of the exhaust gas is performed along the totality of
the exhaust pipe diameter. A multi-hole probe (optional accessory) is hereby used as
sampling probe.
The calculated value shown on the line „CO 0 %“ corresponds to the measured CO
concentration supposed the oxygen content would amount 0% by the same exhaust gas
volume. It is consequently the undiluted CO content in exhaust gas. If the values indication is
stable, press <Record> to store the result in the intermediate memory. If a printout of the
values should occur simultaneously to the recording in the intermediate memory press <F2>
(the complete content of the intermediate memory will be printed out).
Measurement stored in intermediate memory
4.3 Measurement procedure gas analysis: O
2
Check
This measurement is performed by room-independent plants like gross calorific value plants.
It is determined if exhaust gas flows into the combustion air (O
2
content drops down / CO
content can be present) and herewith influence on the combustion quality. For this analysis,
a special multi-hole probe (optional accessory) should be used. If the value indicated is
stable, press <Save> to store the value in the intermediate memory. If a printout of the values
should occur simultaneously to the recording in the intermediate memory, press <F2> (the
complete content of the intermediate memory will be printed out).
Measurement display: O
2
Check
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