10.8 2-point calibration
2-point calibration is a supported offset and slope calibration and is
only available with pH sensors. Calibration is performed with buffer
solutions. The process is performed in two steps with two solu‐
tions.
1. Place the pH sensor in solution 1 (e.g. pH 7)
2. Wait until the sensor has stabilised.
3. The controller automatically enters a value of 7.00 as the cal‐
ibration value. Enter the value of your solution if your solution
has a different value.
4. Press
‘SAVE’
.
5. Place the pH sensor in solution 2 (e.g. pH 4)
6. Wait until the sensor has stabilised.
7. The controller automatically enters a value of 4.00 as the cal‐
ibration value. Enter the value of your solution if your solution
has a different value.
8. Press
‘SAVE’
.
10.9 Temperature compensation (pH)
The temperature has a more or less large influence on the pH
value, depending on the pH deviation from 7 and the temperature
deviation from 25 °C.
If you calibrate the pH with a pH4 solution at a temperature of 10
°C, the difference between the uncompensated and compensated
pH value is around 0.2 pH.
This discrepancy can be corrected with the temperature compen‐
sation function.
A symbol appears alongside the measured value in the calibration
status area if temperature compensation is enabled.
Type: None
n Selection of the compensation mode: this selection key shows
information on the selected mode (e.g. None). Press this key to
change the mode information.
Type: Manual
n Selection of the compensation mode: this selection key shows
information on the selected mode (e.g. Manual). Press this key
to change the mode information.
Unit °C
n Selection of the temperature unit, which you need to enter in
the numeric keypad. The selected unit information (°C) can be
found on this selection key. Press this key to change the unit
information.
Sensor AI3 type
n Selection of the compensation mode: this selection key shows
information on the selected mode (sensor) and the corre‐
sponding entry (e.g. AI3). Press this key to change the mode
information.
Programmed and active compensation: Programmed compensa‐
tion with a sensor, but the sensor measured value is incorrect. Cal‐
ibration is not blocked, but compensation is performed at T = 25°C.
Step 1
Step 2
Calibrating sensors
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