Hach PHC201 - Storage; Section 9 Troubleshooting

8.3 Storage
N O T I C E
Probes can become permanently damaged if kept in a storage solution that is not specified by the
manufacturer. Use only the specified storage solution (Hach pH electrode storage solution or 3 M
KCl).
Do not store the probe in deionized water or in samples of low ionic strength. For short-term storage,
the probe can stay in the sample for a maximum of 2 hours if the sample pH is not high. Put the
soaker bottle that contains the storage solution on the probe when not in use. Refer to Figure 2.
Keep the probe in a vertical position with the sensor and reference junction below the liquid level in
the soaker bottle. Add storage solution to the soaker bottle if necessary.
Figure 2 Probe storage
Section 9 Troubleshooting
Keep the probe clean and in the recommended storage solution when not in use for the best
accuracy, stabilization time and life of the probe.
Problem Possible cause Solution
Decreased probe performance
causes slow stabilization and
prevents accurate calibrations
or measurements.
The glass sensor is dirty. Clean and condition the probe.
Refer to Clean the probe
on page 9.
The glass sensor has become
dry.
Clean and condition the probe.
Refer to Maintenance on page 9.
The calibration slope of the
probe has changed.
Increase the accepted slope limit
settings if possible, or contact
technical support.
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