
Transmitter M400 53
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
The display changes and prompts you to change the gas.
Place the senor in the second calibration gas and press the [ENTER] key to go on with the cali-
bration.
Enter the value for Point 2 including a decimal point and units. The value in the second text line
is the value being measured by the transmitter resp. sensor.
Press [ENTER] to proceed.
The display shows now the values for the phase of the sensor at 100% air (P100) and at 0%
(P0) air.
In case of a successful calibration, the calibration values are stored in the cal history and taken
over (Adjust), stored in the cal history and not taken over (Calibrate) or discarded (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.
7.5.3 Process calibration
The calibration of an optical sensor is always a calibration of the phase of the fluorescence sig-
nal towards the internal reference. During a process calibration the phase in this point is mea-
sured and extrapolated over the measuring range.
Enter O2 opt calibration mode as described in section 7.1 “Enter Calibration Mode”.
Select 1 point 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 blinking in the display.
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.
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