
Transmitter Multiparameter M400 36
© 11 / 08 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M400
Printed in Switzerland 52 121 378
7.4.2 Two point calibration
Select 2 point Calibration.
Place the electrode in the first buffer solution and then press the [ENTER] key.
Auto mode: The display shows the buffer that the transmitter has recognized (Point 1) and
the measured value.
Manual mode: Enter the buffer value and press [ENTER] to proceed.
As soon as the drift conditions have stabilized (or [ENTER] pressed in manual mode) the
display changes and prompts you to place the electrode in the second buffer solution.
As soon as the drift conditions have stabilized (or [ENTER] pressed in manual mode) the
display changes to show the slope calibration factor S and the offset calibration factor Z.
After a successful calibration, the calibration values are taken over and stored in the cal history
(Adjust), only stored in the cal history (Calibrate) or aborted.
7.4.3 Process calibration
Select Process 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 key again to proceed with the
calibration.
Enter the pH value of the sample then press the [ENTER] key to start calibration.
After a successful calibration, the calibration values are taken over and stored in the cal history
(Adjust), only stored in the cal history (Calibrate) or aborted.
7.4.4 mV calibration
Enter mV Calibration mode as described in section 7.1.
The user can now enter Point 1. The offset calibration factor is calculated as:
Point1 + mV (measured value) and displayed on the next screen.
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