3 assigning contact outputs, Calibration, 1 calibration briefs – Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G User Manual
Page 163: 1 principle of measurement, Other functions, 1 display, 1 cell voltage, Warmup hold
IM 11M12D01-01E
10-1
10. Other Functions
10. Other Functions
10.1 Display
On the basic panel display, touch the Detailed Data key to view detailed operational data
(see Figure 10.1). On the detailed data display you can scroll up / down a page with the
᭢ and ᭡ keys, and you can switch to another channel with the ᭣ or ᭤ key . A detailed
data display has 12 pages (screens) per channel. The following describes each data item.
F03-cE.EPS
Ch1
Cell voltage:
0 . 9 mV
Thermo voltage:
2 9 . 4 mV
C.J.resistance: 1 1 7 0 . 2
⍀
Cell temperature: 7 5 0
Њ
C
C.J.temperature: 4 3
Њ
C
Warmup
Hold
Figure 10.1 Detailed Data Display
10.1.1 Cell Voltage
The cell (sensor) voltage will be an index to determine the amount of degradation of the
sensor. The cell voltage corresponds to the oxygen concentration currently being
measured. If the indicated voltage approximates the ideal value (corresponding to the
measured oxygen concentration), the sensor will be assumed to be normal.
The ideal value of the cell voltage (E), when the oxygen concentration measurement
temperature is controlled at 750
ЊC., may be expressed mathematically by:
E = -50.74 log (Px/Pa) [mV]
where, Px: Oxygen concentration in the measured gas
Pa: Oxygen concentration in the reference gas, (21% O
2
)
Table 10.1 shows oxygen concentration versus cell voltage.
Table 10.1 Oxygen Concentration Vs. Cell Voltage, (cell temperature: 750
ЊC)
%O
2
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
mv 117.83
102.56
93.62
87.28
82.36
78.35
74.95
72.01
69.41
%O
2
1
2
3
4
5
6
7
8
9
mv
67.09
51.82
42.88
36.54
31.62
27.61
24.21
21.27
18.67
%O
2
10
21.0
30
40
50
60
70
80
90
mv
16.35
0
-7.86
-14.2
-19.2
-23.1
-26.5
-29.5
-32.1
%O
2
100
mv -34.4
T10.1E.EPS