18. Trouble-Shooting
Dr. A. Kuntze
I
Gutes Wasser mit System
Robert-Bosch-Str. 7a
40668 Meerbusch
+49 (0) 2150-7066-0 / Fax -60
www.kuntze.com
83
the connector, or worse, inside the instrument, can cause signal loss. These
possibilities can be checked with the PH-T. Besides the functions described so far it
provides a high-impedance test, during which the displayed values will change
dramatically if there is any problem with the insulation.
High-impedance test with PH-T
Connect the PH-T to the pH cable of the instrument like a sensor. Select the function
M1 / mV output, and set the output to approx. 180mV. Enter the menu
SYSTEM=>INFO=>VIEW to see if the instrument displays this value +/-5mV.
Activate the high-impedance test of the PH-T by pressing the key MOhm, and see if
the value displayed by the instrument drops dramatically. If it does not, instrument
and cable are probably okay.
Note
The high-impedance test consumes a lot of energy. Deactivate the
test after some seconds.
If these causes can be ruled out, then the focus turns towards the sensor, especially
towards the pH-membrane which might be coated or worn out. Check it for
discoloration and damages, and clean it if necessary. Information on sensor cleaning
can be found in the
“Maintenance of the measurement”.
Some pH glasses can be reactivated with aggressive solutions such as acids.
However, this should only be done by trained personnel.
If cleaning or regeneration did not improve the results, you will have to exchange the
sensor.
Note
Zeropoint and slope error messages will remain until a new
calibration yields values within the tolerances
– or until somebody
resets all settings to factory settings.
Note
If the instrument issues a calibration error (zeropoint or slope),
check the INFO menu in the calibration menu. It lists the results of
the last calibrations with date and time and helps determine
whether the current results are following a general trend or if the
current results differ greatly from previous results, making a
damage or some calibration error more likely.
Содержание Neon pR
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