Mettler Toledo M400/2(X)H Specifikace Strana 78

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Transmitter M400/2(X)H, M400G/2XH 78
© 03 / 2014 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400/2(X)H, M400G/2XH
Printed in Switzerland 30 031 683
11.2.1 Calibrate meter (only for channel A)
The M400 transmitter is factory calibrated within specifications. It is not normally necessary to
perform meter re-calibration unless extreme conditions cause an out of spec operation shown by
Calibration Verification. Periodic verification / re-calibration may also be necessary to meet Q.A. re-
quirements. Meter calibration can be selected as current (used for most dissolved oxygen, Volt-
age, Rg Diagnostic, Rr Diagnostic (used for pH), and temperature (used for all measurements).
11.2.1.1 Temperature
Temperature is performed as a three point calibration. The table above shows the resistance val-
ues of these three points.
Navigate to the Calibrate Meter screen and choose Temperature calibration for Channel A.
Press [ENTER] to begin temperature calibration process
The first text line will ask for the Point 1 temperature resistance value (this will correspond to
temperature 1 value shown on the calibration module accessory). The second text line will show
the measured resistance value. When the value stabilizes, press [ENTER] to perform calibration.
The transmitter screen will then prompt the user to enter the value for Point 2, and T2 will dis-
play the measured resistance value. When this value stabilizes, press [ENTER] to calibrate this
range.
Repeat these steps for Point 3.
Press [ENTER] to bring up a confirmation screen. Select Yes to save the calibration values and
the successful calibration is confirmed on the display.
The transmitter will return to the measurement mode in approximately 5 seconds.
11.2.1.2 Current
Current calibration is preformed as a two point calibration.
Navigate to the Calibrate Meter screen and select Channel A.
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