Siemens LMV5 Quick Start Manual page 182

As previously mentioned, the QGO20 is only capable of measuring %O2 wet. This is true since
it is an in-situ oxygen sensor, not needing any type of water trap, desiccant, or filter.
Most hand-held combustion analyzers measure %O2 dry, and therefore will be considerably
different from the %O2 wet measured by the QGO20 sensor.
Figure 6-3.2 shows these approximate differences along with the raw millivolt signal from the
zirconium oxide O2 cell.
As one would expect, the raw millivolt signal varies with sensor temperature, but this variance is
compensated by the PLL52 module so the LMV52 is fed an accurate, compensated O2 value.
Figure 6-3.1 Conversion Table, %O2 Wet / Dry, Nernst Voltage (Approximate)
%O2 Dry
%O2 Wet
(QGO20) (Nat Gas)
0.1 0.1
1.0 1.2
1.5 1.8
2.0 2.4
2.5 2.9
3.5
3.0
3.5 4.1
4.6
4.0
4.5 5.2
5.7
5.0
5.5 6.3
6.0 6.8
6.5 7.3
7.0 7.9
7.5 8.4
8.0 8.9
8.5 9.4
9.0 9.9
10 10.9
11 11.9
12 12.9
13 13.9
14 14.8
15 15.7
16 16.6
17 17.5
18 18.4
19 19.3
20 20.1
20.9 20.9
LMV5 QSG Rev 4
%O2 Dry %O2 Dry
(#2 Oil) (100% Methane)
0.1 0.1
1.1 1.2
1.7 1.8
2.3 2.4
2.8 3.0
3.4 3.6
3.9 4.1
4.5 4.7
5.0 5.3
5.5 5.8
6.1 6.4
6.6 6.9
7.1 7.5
7.6 8.0
8.2 8.5
8.7 9.0
9.2 9.6
9.7 10.1
10.7 11.1
11.7 12.1
12.7 13.0
13.6 14.0
14.6 14.9
15.6 15.8
16.5 16.7
17.4 17.6
18.3 18.5
19.2 19.3
20.1 20.2
20.9 20.9
Sec 6 Pg 8
Output Voltage Output Voltage
(mV)@ 1292 F (mV)@ 1320 F
111.79
63.61
55.12
49.10
44.43
40.62
37.39
34.60
32.13
29.93
27.93
26.11
24.44
22.89
21.44
20.09
18.83
17.63
15.43
13.43
11.61
9.94
8.38
6.94
5.59
4.32
3.13
1.99
0.92
0.00
www.scccombustion.com
113.59
64.63
56.01
49.90
45.15
41.27
38.00
35.16
32.65
30.41
28.39
26.54
24.83
23.26
21.79
20.42
19.13
17.91
15.67
13.65
11.80
10.10
8.52
7.05
5.68
4.39
3.18
2.03
0.94
0.00