ProMinent DULCOMETER diaLog DACb Assembly And Operating Instruction page 110

Calibration
10.5.2.1 Calibration of the slope
in air
1. Press the CAL key in the continuous
display.
2. Use OK to select the measuring
channel.
The display appears as follows:
ð
CAL O2
Last calibration
Slope
100% (0.80 mA/ppm)
Zero point
4.00 mA
Calibration of the slope in air
Slope calibration by
reference measurement in water
Calibration of zero point
Fig. 66: Calibration of the slope in air
3. Use OK to select the calibration
process: Calibration of the slope in air.
The display appears as follows:
ð
CAL O2
Temperature
Process temperature
Air pressure 1013 mbar
Higher than NNl
Conductivity
Salinity
1) Enter correcting value
2) continue with <CAL>
110
22.09.2019 14:22:33
Manual
10 °C
300 m
0.0 mS/cm
0 g/l
Fig. 67: Correction variable values
4. Enter the current values for the correc‐
tion variables: Use OK to select the cor‐
rection variable. Use the arrow keys to
enter the values.
5. Use CAL to continue.
The display appears as follows:
ð
CAL O2
Latest sensor measured values
Concentration
Sensor current
1) Immerse sensor in
buffer
2) Wait for the stability of the measured value
A2851
Fig. 68: Keeping the sensor in air saturated
with water vapour
6. Keep the sensor in air saturated with
water vapour.
7. Wait for the stability of the measured
values.
8. The display appears as follows if cali‐
bration is successful:
CAL O2
Calibration successful
Slope
Before calibration
After calibration
A2852
A
Zero point
Cancel with <ESC>
Fig. 69: Successful calibration
9.
Use CAL to confirm.
n
Press ESC to cancel.
n
11.10 ppm
12.61 mA
A2853
End with <CAL>
A2854