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Page 19
8.2. CO measurement (gas channel check)
For the technical check of gas-fired plants in regards of safety as-
pects the gas channel check called also CO measurement is used.
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 ho-
mogeneous because of the flow in of secondarily air and conse-
quently 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 oxy-
gen content would amount 0% by the same exhaust gas volume.
It is consequently the undiluted CO
content in exhaust gas. If the value indi-
cation is stable, press the key
<Memory> (disk symbol) to store the
result in the intermediate memory. If a
printout of the values should occur sim-
ultaneously to the recording in the in-
termediate memory, press <F2> (the
complete content of the intermediate
memory will be printed out).
O2
17.5
%
CO 0%
738
ppm
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