Mettler Toledo M300 ISM Specifikace stáhnout pdf (Strana 40)

Transmitter M300 40

Printed in Switzerland 52 121 389

7.2 Conductivity/ResistivityCalibration

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

2-electrode conductivity sensor. It is also not practical to calibrate conducitivity sensors using

(low conductivity) reference solutions. It is recommended that conducitivity sensors be sent

back to the factory for calibration. Consult factory for assistance.

 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 Resitivity (resp. for M300 dual channel the menu Comp/pH/O2) will be considered

and not the temperature compensation selected thru the calibration procedure (see also chapter

8.2.4.1 “Conductivity/Resistivity/ Temperature Compensation“; PATH: Menu/Configure/Measure-

ment/Resitivity).

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

When configuring Thornton model transmitters, after selecting the desired sensor calibration

and pressing [ENTER], the next screen will ask to select the type of temperature compensation

mode desired during the calibration process. The choices are ”None”, ”Standard”, ”Light 84”,

”Std 75 ºC”, ”Lin 20°C = 02.0%/ºC” (user selectable value), ”Lin 25°C = 02.0%/ºC” (user se-

lectable value), ”Glycol.5”, ”Glycol1”, ”Alcohol” and “Nat H2O”.

All other models provide the options ”Standard”, ”Lin 20°C = 02.0%/ºC” (user selectable value),

and ”Lin 25°C = 02.0%/ºC” (user selectable value) as Compensation mode thru the calibration.

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.

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

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Mettler Toledo M300 ISM Specifikace Strana 40