Dr. A. Kuntze K 100 W PR Manuel - Sayfa 20

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5.1 Calibration

Main menu

Calibrate

Basic settings

Calibration procedure

Switch the controller OFF and select manual temperature compensation. Enter

the temperature of the calibration solutions.

Immerse the electrode in one of the calibration solutions. Wait until the

measured value is stable, then calibrate by pressing keys and - while still

applying pressure - additionally key

now displayed as measured value.

Rinse the electrode and repeat step 2 with the second calibration solution.

Check the slope and sensor zero-point, then put the electrode back into the

armature. Select automatic temperature compensation and switch ON the

controller.

NOTE

Buffers

At works the following buffers are stored:

Calibration solutions:

Inner buffer of the electrode:

If you want to use other calibration solutions, adjust the values - it does not matter if

you start with the higher or the lower pH.

If you are using electrodes with a special inner buffer, adjust the pH value of the sensor

buffer, since this value is used as zero for the calculation of the measured values. You

will find the pH of the sensor buffer printed on the electrode.

Calibrate

Meas. val. 6.99pH

Cal. press &

Slope

058 mV/pH

Sensor zero

001 mV

Basic settings

Buffers used

The slope should be close to 59 mV, the zero-point close to 0 mV. The

slope decreases and the zero error increases with time. When either

value exceeds certain limits, the instrument displays an error

message indicating that the electrode has to be replaced.

buffer solutions pH 4 and pH 7

pH 7

K 100 PR & K 100 W PR

The calibration solutions stored as

„buffers used" are recognised

automatically. It does not matter whether

you start with buffer 1 or 2.

Buffers used

Buffer 1

7.00 pH

Buffer 2

4.00 pH

Sensor buffer

7.00 pH

. The pH of the calibration solution is