Specifications

Table Of Contents
Transmitter M400 61
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
As soon as the stabilisation criteria have been fulfilled 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 (Adjust) or were aborted
(Calibrate or Abort).
If ”Adjust” or ”Calibrate” are 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 press-
ing ”ENTER” the M400 returns to the measuring mode.
7.8.1.2 Manual Mode
Place the electrode in the buffer solution. The display shows the buffer the transmitter has recog-
nized (Point 1) and the measured value. Press [ENTER] to proceed.
The display shows now the slope calibration factor S and the offset calibration factor Z.
After a successful calibration, the calibration values are taken over (Adjust) or were aborted
(Calibrate or Abort).
If ”Adjust” or ”Calibrate” are 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 press-
ing ”ENTER” the M400 returns to the measuring mode.
7.8.2 Two-point calibration
Enter CO
2
calibration mode as described in section 7.1 “Enter Calibration Mode”.
Select 2 Point calibration.
Depending on the parameterized Drift control (see chapter 8.2.3.5 “Dissolved carbon dioxide
parameters”) one of the two following modes is active.