Co Measurement (Gas Path Check) - Ecom EN2 Operating Instructions Manual

The CO sensor is protected against exceedings thanks to an internal
programme. If the 4000 ppm limit value is exceeded, so a purging
pump is activated which provides the sensor with fresh air. After sufficient
purging time (X behinds CO disappears) the sensor can be reintegrated
into the measurement system with <F3> (if you choose „Yes" at
„Adjustments" / „Internal" / „CO-Automatic" the CO sensor switchs
to measurement automaticaly). The sensor can also be manually be
excluded from the measurement system with <F3>.

8.2. CO Measurement (gas path check)

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
secundary 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 simulataneously to the
recording in the intermediate memory
press <F2> (the complete content of the
intermediate memory will be printed out).
Page 16
17.5
O2
738
CO 0%
123
CO
7.00
Excess air
CO measurement
Measurement stored
in intermediate
memory
ecom-EN2
%
ppm
ppm