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9.6.2.3 Two point calibration
> You will be prompted to immerse the sensor into the first calibration medium (ambient air).
Confirm this dialog with (ON/OFF). The currently measured values will be displayed.
If the measured values (pH + temperature!) are in a stable condition, reconfirm by pressing
(ON/OFF).
> You will be prompted to enter a nominal value (temperature-corrected buffer value!).
Via (INFO) or (CAL) you select the position to change.
Via (CONF +1) or (LOG -1) you change the position.
(ON/OFF) confirms and saves your setting.
(MEAS) terminates the entry dialog without transferring the value.
> You will be prompted to immerse the sensor into the second calibration medium.
Perform the same steps as with the first calibration solution.
9.6.2.4 Three point calibration
> You will be prompted to immerse the sensor into the first calibration medium (ambient air).
Confirm this dialog with (ON/OFF). The currently measured values will be displayed.
If the measured values (pH + temperature!) are in a stable condition, reconfirm by pressing
(ON/OFF).
> You will be prompted to enter a nominal value (temperature-corrected buffer value!).
Via (INFO) or (CAL) you select the position to change.
Via (CONF +1) or (LOG -1) you change the position.
(ON/OFF) confirms and saves your setting.
(MEAS) terminates the entry dialog without transferring the value.
> You will be prompted to immerse the sensor into the second calibration medium.
Perform the same steps as with the first calibration solution.
> You will be prompted to immerse the sensor into the third calibration medium.
Perform the same steps as with the first calibration solution.
9.6.2.5 Automatic Two point- and Three point- calibration
The automatic calibration of the pH measurement is a two or a three point calibration and requires the
knowledge, which buffer solutions you would like to use for the calibration.
The Lab 845 offers the following buffer sets for the calibration:
NBS standard buffering solution as per DIN 19266: pH value at 25 °C 1.68 / 4.01 / 6.86 / 9.18 / 12.45
Technical buffering solution as per DIN 19267:
Merck buffering solution:
Mettler Toledo buffering solution:
> Select the buffer set you would like to use for the calibration.
You will be prompted to immerse the sensor into the first calibration solution.
Confirm this dialog with (ON/OFF). The currently measured values will be displayed.
If the measured values (pH + temperature!) are in a stable condition, reconfirm by pressing
(ON/OFF). The found buffer will be displayed, reconfirm with (ON/OFF).
pH value at 25 °C 1.09 / 3.06 / 4.65 / 6.79 / 9.23
pH value at 20 °C 4.00 / 7.00 / 9.00
pH value at 25 °C 1.679 / 4.003 / 7.002 / 10.013
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