8.5.1 Description of the Calibration of pH Sensors
8.5.1.1
2-Point Calibration
2-Point Calibration
Recommended as the standard method
Calibration of pH sensors with temperature as the correction variable
When calibrating with temperature as the correction variable, the temperature of the
buffer solution must be set in "manual" operating mode before calibration.
In "Automatic" operating mode, the temperature sensor must be immersed in the
buffer solution. The calibration values are then calculated whilst taking into consider‐
ation the buffer temperature.
Temperature setting and specification only with correction value
calibration pH
zero p.:
slope 25°C
0.0 mV
59.16 mV/pH
calibration
zero p.:
slope 25
°C
-2.1 mV
59.07 mV/pH
calibration
sensor in buffer
1 !
7.56 pH
33.0°C
calibration
calib. 1 active
please wait !
6.96 pH
33.
0°C
calibration pH
buffer1:
buffer2:
33.0°C
calibration
calib. 2 active
please wait !
3.97 pH
33.0 °C
calibration
buffer1:
buffer2:
33.0
°C
7.00 pH
4.00 pH
calibration
2 !
4.12 pH
33.0°C
= automatic timing
Permanent display
1
sensor in buffer
A0060_GB
7.00 pH
Fig. 44: Calibration of pH sensors
Measured Variables and Operating Menus for Potentiometric Sensors
88
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