7 | Maintenance
PH20
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B-H86.0.11.DB201-1.0
2.
(ONF
appears in the display. Release the Function key.
3. The parameter
SET.T
appears if the temperature sensor is not plugged in. If the
temperature sensor is plugged in, you jump to the next point.
4. Enter the temperature of the buffer solution by pressing the
Up key
and
Down key
and confirm the entry by pressing the
Function key
again.
5. The
PK.OF
parameter appears in the display.
6. Place the electrode in the buffer solution with a value between pH 6.75 and pH
7.25.
7. Wait until the display value is stable.
8. Adjust the value corresponding to the buffer solution with the
Up key
and
Down key
and confirm the entry by pressing the
Function key
.
9. The
PK.SL
parameter appears in the display.
10. Place the electrode in the second buffer solution with a value below pH 6 or above
pH 8.
NOTE
A gradient compensation with buffer solutions between pH 6 and pH 8 is not possible.
With entry of the compensation value, the resulting gradient value is calculated imme-
diately and
(AL ERR.2
or
(AL ERR.3
appears in the display instead of the measurement of
the values are invalid.
11. Wait until the display value is stable.
12. Adjust the value corresponding to the buffer solution with the
Up key
and
Down key
and confirm the entry by pressing the
Function key
.
13. Then, rinse the electrode again with distilled or deionised water.
Outcome of an action
After successful completion of the calibration the assessment of the electrode condi-
tion is displayed briefly in percent. Then, the current measurement is shown in the dis-
play again. A low value can be the result of the age of the electrode, contaminated or
old buffer solutions or impurities on the BNC connector.
If the calibration is not completed successfully an error message is displayed.
(AL ERR.
appears in the display. See
message pressing the
Function key
. The product restarts and the standard value for
the zero point and gradient are restored.
