Krohne OPTISENS PAC 050 EN Instrukcja Użytkownika Pobierz pdf (Strona 16)

Manual OPTISENS PAC 050

OPTISENS PAC 050 16

4.4 Calibration

Main menu

Calibrate



Meas. val. 6.99pH

Cal. press & 

Slope

058 mV/pH

The calibration solutions stored as „buffers

used“ are recognised automatically. It does

not matter whether you start with buffer 1

or 2.

Sensor zero

001 mV

Basic settings



Buffers used



Buffer 1

7.00 pH

Buffer 2

4.00 pH

Sensor buffer

7.00 pH

4.4.1 Calibration procedure

1) Switch the controller OFF and select manual temperature compensation. Enter the temperature of the

calibration solutions.

2) 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 .

The pH of the calibration solution is now displayed as measured value.

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

4) 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

The slope should be close to 59 mV/pH, 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.

4.4.2 Buffers

At works the following buffers are stored:

• Calibration solutions: buffer solutions pH 4 and pH 7

• Inner buffer of the electrode: pH 7

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.

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