Mettler Toledo M400 Dokumentacja Pobierz pdf (Strona 46)

Transmitter M400 46

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After the calibration the Multiplier or slope calibration factor ”M” and the Adder or offset calibra-

tion factor ”A” are displayed.

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).

* only available with ISM sensor. The values will be stored in the sensor.

If ”Adjust” or ”Calibrate” are chosen, the message ”Calibration successful” is displayed. The

M400 returns to the measuring mode.

7.3 Conductivity calibration for inductive sensors

This feature provides the ability to perform a one-point offset, one-point slope or process

calibration for the inductive conductivity sensors. This feature is only available at the

M400 Type 1 Cond Ind.

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.

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 H2O” 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” at a devia-

tion from 25 °C. The factor can be modified.

Lin 20 °C compensation: adjusts the reading by a factor expressed as ”% per °C” at a devia-

tion from 20 °C. The factor can be modified.

Nat H

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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Mettler Toledo M400 Dokumentacja Strona 46