
Transmitter M300 48
© 12 / 11 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M300
Printed in Switzerland 52 121 389
7.5.3 ProcessCalibration
Select Process Calibration. At pH sensors a process calibration is always performed as a offset
calibraton.
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 displayed in the top left
hand corner.
After determining the pH Value of the Sample, press the [CAL] key again to proceed with the cali-
bration.
Enter the pH value of the sample then press the [ENTER] key to start the calculation of the cali-
bration results.
After the calibration the slope calibration factor S and the offset calibration factor Z are displayed.
Select Yes to save the new calibration values and the successful Calibration is confirmed on the
display. If an ISM sensor is connected, the calibration data will be stored in the sensor. The A
resp. B in the top left hand corner disappears after 20 seconds.
7.5.4 mVCalibration(notonISMVersion)
Enter mV Calibration mode as described in section 7.1 “Enter Calibration Mode”.
Enter the value for Point 1. The offset calibration factor is calculated by using the value of Point1
instead of the measured value (line 4, mV = ....) and is displayed on the next screen.
Z is the newly calculated offset calibration factor. The slope calibration factor S is always 1
and does not enter the calculation.
Select Yes to save the new calibration values and the successful Calibration is confirmed on
the display.
You will get the message ”Re-install sensor” and ”Press Enter” on the display. After pressing
”Enter” the M300 returns to the measuring mode.
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