Dr. A. Kuntze Neon pR, Руководство пользователя

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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
80
We advise to follow the suggestions in the order in which they are presented.
Event message Cause Suggested remedies
Zeropoint After calibration, the zeropoint
was not within -
60…60mV
Check settings buffer/internal
buffer; repeat calibration
Change reference electrode/
change sensor
If you get a zeropoint error, the zeropoint after calibration did not fit your calibration
settings. This might simply be because the settings did not correspond to the buffers
or the sensor that you used.
Note The internal buffer is the buffer filled into the pH-glass bulb. The
pH of this buffer represents the zeropoint of your sensor. You can
find the pH of the internal buffer printed on the sensor, whenever it
is not pH 7.
If all settings were correct, the problem might still be caused by one of the solutions,
if it does not have the expected pH. If you have a spare buffer at hand, you can
check if it gives the same results.
With a zeropoint error, the menu SYSTEM=>INFO=>VIEW is helpful, since it
displays the raw signal of the sensor, unaffected by the current calibration. The raw
signal is displayed in mV. If the internal buffer is pH 7, then a calibration buffer of pH
7 should yield a signal around 0 mV. Deviations of less than 1 pH (approx. 60mV) are
tolerated.