
Transmitter M400/2(X)H, M400G/2XH 44
© 03 / 2014 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400/2(X)H, M400G/2XH
Printed in Switzerland 30 031 683
7.4.3 Process calibration
Enter pH calibration mode as described in section 7.1 “Enter Calibration Mode”.
Select Process calibration. With pH sensors a process calibration is always performed as a
offset calibration.
Take a sample and press the [ENTER] key again to store the current measuring Value. To show
the ongoing calibration process, A or B (depending on the channel) is blinking in the display.
After determining the pH value of the sample, press the [CAL] key again to proceed with the
calibration.
Enter the pH value of the sample then press the [ENTER] key to start the calculation of the
calibration results.
After the calibration the slope calibration factor S and the offset calibration factor Z are displayed.
In case of a successful calibration, the calibration values are stored in the cal history* and taken
over (Adjust), stored in the cal history* and not taken over (Calibrate) or discarded (Abort).
* only available with ISM sensor. The values will be stored in the sensor.
If ”Adjust” or ”Calibrate” are chosen, the message ”Calibration successful” is displayed. The
M400 returns to the measuring mode.
7.4.4 mV calibration (only for analog sensors)
Enter mV calibration mode as described in section 7.1 “Enter Calibration Mode”.
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