Instruction manual

9.0 CALIBRATION SM425 INSTRUCTION MANUAL
and the span-point correction ratio by C/A x 100 (%). If the zero correction ratio is not within the 100 ± 30
% range or the span correction ratio is not in the 0 ± 18 % range, the sensor can not be calibrated.
Figure 9-2 Calculation of a Two-point Calibration Curve
Figure 9-3 shows a one-point calibration using only span gas. In this case, only the cell electromotive
force for a span gas with oxygen concentration p1 is measured. The cell electromotive force for the zero
gas is carried over from a previous calibration. One-point calibrations using only zero gas can also be
performed. The zero and span point correction factors are determined and the restrictions described
above still apply.
Figure 9-3 Calculation of a One-point Calibration
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