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Multi 9620 IDS Ion concentration

ba77173e04 12/2017 47

7 Ion concentration

7.1 Measuring

7.1.1 Measuring the ion concentration

The sensor connection and the USB-B (USB Device) interface are

galvanically insulated. This facilitates interference-free measure-

ments also in the following cases:

 Measurement in grounded test samples

 Measurement with several sensors connected to one

Multi 9620 IDS in one test sample

Incorrect calibration of ion sensitive electrodes will result in incor-

rect measured values. Calibrate regularly before measuring.

For precise ISE measurements the temperature difference

between measurement and calibration should not be greater that

2 K. Therefore, adjust the temperature of the standard and

measuring solutions accordingly. If the temperature difference is

greater the [TempErr] warning appears in the measured value

display.

1. Connect an ISE combination electrode to the meter with the aid of a

ADA 94/IDS BNC or ADA 94/IDS DIN.

The pH/ISE measuring window is displayed.

2. In the measured value display, select the ISE measuring window with

<><> and <M>.

3. Specify the ion type in the ISE setup/Ion type menu as necessary.

4. If necessary, measure the temperature of the test sample with a ther-

mometer.

5. Calibrate or check the meter with the electrode.

While no valid calibration is available, e.g. in the delivery condition,

"Error" appears in the measured value display.

6. Immerse the electrode in the test sample.

wtw inoLab Multi 9620 IDS User Manual

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