Technical Product Information - Breitband-Lambda

3. Functional values
Technical Product Information
Y 258 E00 015e
Seite/Page 7 von/of 13
Datum/Date 14.6.2005
All data must be regarded as nominal values, measured under the following
conditions:
The sensor is operated with circuit as in section 1.1. The heater power is
closed-loop controlled, so that the nominal sensor internal resistance is
reached. The measurement is done in a lab test bench at pgas=1013hPa.
Changes in the test gas composition, especially of the H2-concentration,
will have an influence on the characteristics of the sensor. These influences
are stronger in rich gas than under lean gas conditions.
3.1 Nominal characteristic line
I P meas / mA
3,000
2,500
2,000
1,500
1,000
0,500
0,000
0 5 10 15 20 25
-0,500
IP meas / mA
1,500
1,000
0,500
-0,500
-1,000
-1,500
-2,000
gas: O 2 in N 2
calibration point
O 2-concentration x O2 / %
0,000
0,70 0,80 0,90 1,00 1,1 1,20 1,30 1,40 1,50 1,60 1,70 1,80 1,90 2,00 2,10 2,20 2,30 2,40 2,50
rich gas mixture of synthetic gas
9%CO, 7%H2, 7%CO2 in N2
lean gas: O 2 in N2
λ = (xO2 / 3 +1) / (1-4.77*xO2 ) for H/C=2
O2-conc. xO2/% 3.0 6.0 8.29 12.0 20.95
λ-value 0.65 0.70 0.80 0.90 1.016 1.18 1.43 1.70 2.42 air
Ip,meas/mA -2.22 -1.82 -1.11 -0.50 0.00 0.33 0.67 0.94 1.38 2.54
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