Siemens LMV51.140C1 - Page 200

TechnicalInstructions  LMVSeries
DocumentNo.LV5‐1000
Section6 Page28SCCInc.


Aspreviouslymentioned,theQGO20isonlycapableofmeasuring%O
2
wet.Thisistruesinceitisanin‐
situoxygensensor,notneedinganytypeofwatertrap,desiccant,orfilter.In‐situsensorstypicallyhave
amuchshorterdelaytime(Tautime)andrequiremuchlessmaintenancethanothertypesofO
2

sensors.

Mosthand‐heldcombustionanalyzersmeasure%O
2
dry,andthereforewillbeconsiderablydifferent
fromthe%O
2
wetmeasuredbytheQGO20sensor.

Figure6‐11showstheseapproximatedifferencesalongwiththerawmilli‐voltsignalfromtheZirconium
oxideO
2
cell.Asonewouldexpect,therawmilli‐voltsignalvarieswithsensortemperature,butthis
varianceiscompensatedbythePLL52modulesotheLMV52isfedanaccurate,compensatedO
2
value.

%O
2
Wet
%O
2
Dry
(Natural Gas)
Output Voltage
(mV) @ 1292 F
Output Voltage
(mV) @ 1320 F
0.1 0.1 111.79 113.59
1 1.3 63.61 64.63
1.5 1.9 55.12 56.01
2 2.5 49.10 49.90
2.5 3.1 44.43 45.15
3 3.8 40.62 41.27
3.5 4.4 37.39 38.00
4 5.0 34.60 35.16
4.5 5.6 32.13 32.65
5 6.3 29.93 30.41
5.5 6.9 27.93 28.39
6 7.5 26.11 26.54
6.5 8.1 24.44 24.83
7 8.7 22.89 23.26
7.5 9.3 21.44 21.79
8 9.9 20.09 20.42
8.5 10.6 18.83 19.13
9 11.2 17.63 17.91
10 15.43 15.67
11 13.43 13.65
12 11.61 11.80
13 9.94 10.10
14 8.38 8.52
15 6.94 7.05
16 5.59 5.68
17 4.32 4.39
18 3.13 3.18
19 1.99 2.03
20 0.92 0.94
20.9 0.00 0.00

 Figure6‐11:O
2
Wet,O
2
Dry,andNernstVoltageConversion(approximate)

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