
Transmitter M300 44
© 12 / 11 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M300
Printed in Switzerland 52 121 389
7.3.1.2 Manualmode
Enter the value for Point 1 including a decimal point and units. The value in the second text line
is the value being measured by the transmitter and sensor in the units selected by the user.
Press [ENTER] when this value is stable to perform the calibration.
After the calibration the slope calibration factor S and the offset calibration factor Z are displayed.
Select Yes to save the calibration values and the successful Calibration is confirmed on the dis-
play. If an ISM sensor is connected, the calibration data will be stored in the sensor.
You will get the message ”Re-install sensor” and ”Press Enter” on the display. After pressing
”Enter” the M300 returns to the measuring mode.
7.3.2 ProcessCalibration
Enter Oxygen Calibration mode as described in section 7.1 “Enter Calibration Mode”.
Select Process followed by either Slope or ZeroPt as the calibration type. Press [ENTER]
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 O
2
Value of the Sample press the [CAL] key again to proceed with the cali-
bration.
Enter the O
2
value of the sample then press the [ENTER] key to start calibration.
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.
7.4 OzoneCalibration(ThorntonModelsonly)
Dissolved Ozone calibration is performed as a 1 point calibration and must be performed quick-
ly because ozone decays rapidly into oxygen, especially at warm temperatures.
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