<9. Calibration>
9-3
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
E = -K log y/a = -Klog [(100 – x) 30.21] /21
where, K = Constant
force.
Sample gas
Comparison
water vapor
+
-
H
2
O
concentration
indicator
Electrode
Water vapor
100%
Air
100%
100%
H
2
O
79%
21%
O
2
N
2
y%
x%
Sample gas composition
Zirconia element
F9-1E.ai
Figure 9.2 Schematic Diagram of Measurement Principle
(B) For the “mixing ratio” measurement
Assuming that the mixing ratio is rkg/kg, then “r” can be calculated from the value of H
2
O vol %
as follows:
E = -K log y/a = -K log 50.622 3 21/(0.622 + r)/216
where, K = Constant
120
100
80
60
40
20
0
0.1
1
10 100
Cell output, mV
E = -50.74 log PX/20.6
Oxygen concentration vs. cell output
Oxygen concentration PX (%O
2
)
F9-2E.ai
Figure 9.3
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