
Transmitter M400 47
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
7.3.1 Zero-point calibration
(Display reflects typical Conductivity sensor calibration)
Enter Conductivity Sensor Calibration mode as described in section 7.1 “Enter Calibration Mode”
and choose one of the compensation modes (see section 7.3 “Conductivity calibration for in-
ductive sensors”).
Select Zero Point and press [ENTER].
Press the [ENTER] key again to go on with the calibration.
The display changes to show the multiplier or slope calibration factor ”M” i.e. cell factor and the
adder or offset calibration factor ”A”.
After a successful calibration, the calibration values are taken over (Adjust) or discarded (Cali-
brate) or (Abort).
If ”Adjust” is chosen, the message ”Calibration successful” is displayed. In any case you will get
the message ”Re-install sensor” and ”Press ENTER” on the display. After pressing ”ENTER” the
M400 returns to the measuring mode.
7.3.2 One-point slope calibration
Enter Conductivity Sensor Calibration mode as described in section 7.1 “Enter Calibration Mode”
and choose one of the compensation modes (see section 7.3 “Conductivity calibration for in-
ductive sensors”).
Select 1 point Slope and press [ENTER].
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.
The display changes to show the multiplier or slope calibration factor ”M” i.e. cell factor and the
adder or offset calibration factor ”A”.
After a successful calibration, the calibration values are taken over (Adjust) or discarded (Cali-
brate) or (Abort).
If ”Adjust” is chosen, the message ”Calibration successful” is displayed. In any case you will get
the message ”Re-install sensor” and ”Press Enter” on the display. After pressing ”Enter” the
M400 returns to the measuring mode.
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