Xylem MultiLab 4010-2 Manual do Utilizador descarregar pdf (Página 58)

Conductivity MultiLab 4010-2

58 ba76142e01 05/2013

8.3 Calibration

8.3.1 Why calibrate?

Aging slightly changes the cell constant, e. g. due to coatings. As a result, an

inexact measured value is displayed. The original characteristics of the cell can

often be restored by cleaning the cell. Calibration determines the current value

of the cell constant and stores this value in the meter.

Thus, you should calibrate at regular intervals.

8.3.2 When to calibrate?

 After connecting a sensor

 Routinely within the framework of the company quality assurance

 When the cleaning interval has expired

8.3.3 Determining the cell constant (calibration in control standard)

You can determine the actual cell constant of the IDS conductivity sensor by

calibrating with the control standard in the following range:

 0.450 ... 0.500 cm

-1

(e.g. 4310, nominal cell constant 0.475cm

-1

)

The cell constant is determined in the control standard, 0.01 mol/l KCl.

In the delivery condition, the calibrated cell constant of the IDS sensor is set to

0.475 cm

-1

(4310 IDS conductivity sensor).

For this calibration procedure, the Type setting must be set to cal. Proceed as

follows to determine the cell constant:

1. Connect the conductivity sensor to the meter.

2. In the measured value display, select the conductivity parameter with

<M>.

3. Start the calibration with <CAL>.

The cell constant that was calibrated last is displayed.

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Xylem MultiLab 4010-2 Manual do Utilizador Página 58