10.5.2.3 Calibration of the zero
point
Calibration of the zero point is only needed for
precise measurements at the lower end of the
measuring range (< 5% of the measuring
range).
CAL O2
A2860
Zero point
Slope
Last calibration
22.09.2019 14:22:33
4.00 mA
100% (0.80 mA/ppm)
Calibration of zero point
Slope calibration by
reference measurement in water
Calibration of the slope in air
Fig. 77: Introduction: Calibration of the zero
point
1. Use OK to select the calibration
process: Calibration of the zero point.
ð
The display appears as follows:
CAL O2
A2861
Zero point 4.05 mA
Accept with <CAL>
Range 3.95 mA - 4.15 mA
Fig. 78: Zero point
2. Position the sensor in an oxygen-free
environment e.g. in water with a slight
excess of sodium hydrogen sulfite and
wait until the signal is stable
3. Use CAL to accept
4. The display appears as follows if cali‐
bration is successful:
CAL O2
A2854
Before calibration
Slope
Calibration successful
Cancel with <ESC>
After calibration
A
Zero point
End with <CAL>
Fig. 79: Successful calibration
5.
n Use CAL to confirm
n Press ESC to cancel
6. The display appears as follows if cali‐
bration is unsuccessful:
CAL O2
A2855
Before calibration
Slope
Calibration not possible
Cancel with <ESC>
After calibration
A
Zero point
End with <CAL>
---
i
Fig. 80: Unsuccessful calibration
7.
n Use CAL to end
n Press ESC to cancel
8. Check the sensor and installation once
again and repeat the calibration proce‐
dure.
Calibration
113
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