Mettler Toledo M400/2(X)H Especificaciones descargar pdf (Pagina 36)

Transmitter M400/2(X)H, M400G/2XH 36

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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.

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” 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 H2O compensation: includes compensation to 25 °C according to EN27888 for natural

water.

Choose the compensation mode, modify the factor where appropriate and press [ENTER].

7.2.1 One-point sensor calibration

(Display reflects typical Conductivity Sensor calibration)

Enter Conductivity Sensor Calibration mode as described in section 7.1 “Enter Calibration Mode”

and choose one of the compensation modes (see section 7.2 “Conductivity calibration for two

or four electrode sensors”).

Select 1 point calibration and press [ENTER]. With conductivity sensors a one-point calibration

is always performed as a slope calibration.

Place the electrode into the reference solution.

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Mettler Toledo M400/2(X)H Especificaciones Pagina 36