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6. Add new KCl crystals to the probe until there is approximately 0.5 cm (0.2 in.) of crystals above
the glass bulb. Refer to
7. Fill the probe with new filling solution. Refer to
8.5 Soak procedure for dry probes
If the glass bulb becomes dry, complete the steps that follow to hydrate the probe.
1. Soak the probe tip in a warm pH 4 buffer solution for 2 hours.
2. Rinse the probe with deionized water. Blot dry with a lint-free cloth.
3. Calibrate the probe.
8.6 Storage
Probes can become permanently damaged if kept in a storage solution that is not specified by the
manufacturer. Use only the specified storage solution (saturated 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. Close the
filling hole and put the soaker bottle that contains the storage solution on the probe when not in use.
Refer to
Figure
7. 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 7 Probe storage
Figure 6
on page 14.
N O T I C E
Fill the probe
on page 12.
English 15
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