
Transmitter M400 43
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
7.2 Conductivity calibration
for two- or four-electrode sensors
This feature provides the ability to perform a one-point, two-point or process Conductivity resp.
Resistivity ”Sensor” calibration for two- or four-electrode sensors. The procedure described below
works for both types of calibrations. There is no reason to perform a two-point calibration on a
two-electrode conductivity sensor. Four electrode sensors do require a two-point calibration.
h
NOTE: When performing calibration on a conductivity sensor, results will vary depending on the
methods, calibration apparatus and / or quality of reference standards used to perform the cali-
bration.
h
NOTE: For measuring tasks the temperature compensation for the application as defined
at the menu Resistivity will be considered and not the temperature compensation selected thru
the calibration procedure (see also chapter 8.2.3.1 “Conductivity temperature compensation“;
PATH: Menu/Configure/Measurement/Resistivity).
Enter Conductivity sensor calibration mode as described in section 7.1 “Enter Calibration Mode”.
The next screen will ask to select the type of temperature compensation mode desired during the
calibration process.
Choices are ”Standard”, ”Lin 25 °C”, ”Lin 20 °C” or ”Nat H
2
O” compensation mode.
Standard compensation: includes compensation for non-linear high purity effects as well as
conventional neutral salt impurities and conforms to ASTM standards
D1125 and D5391.
Lin 25°C compensation: adjusts the reading by a factor expressed as ”% per °C” deviation
from 25 °C. The factor can be modified.
Lin 20°C compensation: adjusts the reading by a factor expressed as ”% per °C” deviation
from 20 °C. The factor can be modified.
Nat H
2
O compensation: includes compensation to 25 °C according to EN27888 for natural
water.
Choose the compensation mode, modify the factor where appropriate and press [ENTER].
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