52 3200P pH Meter User Guide
3 Troubleshooting and Maintenance
General Troubleshooting Procedure
During the use of the meter, there are many factors that
may affect the measurement, including the electrode, the
standard solutions used to calibrate electrode, the sample
solution, the temperature during measurement, incorrect
operation, or use, and so forth. When the measured results
are significantly different from what was expected, first
determine whether the meter itself or factors other than the
meter caused the error. Follow the suggestions described
below to diagnose the problem. Since there are multiple
measuring methods, you will need to diagnose the meter
based on your application conditions.
Diagnose whether the errors are caused by meter hardware,
electrode calibration data error, parameter errors, or other
errors, including the sample solution, solution preparation,
buffer solutions used for calibration, and so forth.
For factors other than the meter, compare measurement
results between known solutions. Put the electrode in
different standard solutions. Check the corresponding
potential (mV) value and pH value. Based on the
comparison, judge whether the deviation is resulted from the
electrode, the solution, or something else.
Check the temperature measurement
Because temperature measurements are used for all
measurements, always ensure temperature measuring is
functioning well.
Connect the ATC temperature diagnostic tool (5185- 8390) to
the meter. Turn on the meter to enter into measurement
state. With the ATC temperature diagnostic tool connected,
the meter should display a temperature reading between 49.0
to 51.0 °C. If yes, the meter is correctly measuring
temperature. If the meter displays a temperature reading
significantly different from 50 °C, there is a problem with
the meter. Contact Agilent service.
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