Ecom CN Operating Instructions Manual - Co-Measur.
Page 10
ecom-CN
They will be stored there for a later printout and, if need be, a final
data record storage (you can view the values in the intermediate
memory by pressing
- during the inquiry the gas pump switch-
es off).
The CO sensor is protected against overload by the internal pro-
gramme. If the limit value of 4000 ppm is exceeded, a second pump
switches on and flows the sensor with fresh air. The sensor with can
be switched into the measuring mode by pressing the
key (the
sensor can also be switched off by pressing the
key).
4.3. CO measurement (safety check)
The check of gas-fired plants for operation safety reasons is per-
formed with the CO measurement. The CO content in the exhaust
pipe is measured after the flow fuse and converted on an undiluted
value (residual oxygen value in exhaust gas = 0 %).
As the gas behaviour after the flow fuse is no more homogeneous
because of the flow in of secondary air and the core stream meas-
urement could consequently be erratic, the gas analysis is performed
over the total diameter of the pipe. A multi-hole probe serves as
sampling probe hereto (optional accessory).
The calculated value indicated on the line CO 0.0% corresponds to
the measured CO content supposing that the oxygen content would
amount 0% in the same gas volume. It is consequently the undiluted
CO content in exhaust gas. Once the value is stable, press
to store the value in the intermediate memory.
CO-measur.
O2
17.5 %
CO 0.0%
738 ppm
CO
123 ppm
Lambda
7.00
m
Measurement
stored in inter-
mediate memory