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3 Introduction
If concentrations of O
are higher, more unburned residues (CO/H
2
the 3-phase limit is reached. The graph below shows the influence of the sensor
voltage U
as a function of the O
COe
1000
800
600
400
200
0
0
2000
Fig. 3: Sensor voltage U
We therefore recommend calibrating the characteristic in line with the specific system
by performing a CO reference measurement.
A further indicator for unburned residues (CO/H
dynamics of the sensor signal (Us). As the content of unburned residues increases, so
do the dynamics. Figure 4 below plots the rise of the sensor signal versus the
measured O
value in a reference system (12 MW gas combustion) at low load.
2
700
600
500
400
300
200
100
0
0
1
small load
Fig. 4: Sensor voltage U
gas combustion
content.
2
4000
CO [ppm]
as a function of O
content
COe
2
2
Signal dynamic
>
+
100 mV
3
2
O ref. [%]
2
plotted versus the O
COe
2
15
) oxidise before
2
at starting
point with
0% CO
9,5 % O
6
6000
8000
) in combustion systems is the
5
4
value of 12MW
2
% O
2
10000
300
40
2
6
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