Replace The Filling Solution - Hach PHC705 User Manual

Figure 6 Add KCl crystals to the probe

8.4 Replace the filling solution

Replace the filling solution and KCl crystals when one of the conditions that follow occurs:
• The filling solution becomes contaminated.
• The KCl crystals in a probe do not move freely through the liquid when the probe is inverted.
1. Tilt the probe and open the filling hole.
2. Use a syringe or small transfer pipet to remove as much of the filling solution and KCl crystals
from the probe as possible. Discard the solution and KCl crystals.
3. Remove the remaining KCl crystals as follows:
a. Fill the probe half full with deionized water. Close the filling hole.
b. Shake the probe until the crystals become loose.
Note: If the crystals do not loosen, fill the probe with deionized water and put the probe in a warm water
bath (maximum 60 °C (140 °F)) for approximately 10 minutes.
c. Use a syringe or small transfer pipet to remove the remaining solution and KCl crystals.
4. Rinse the inner probe three times with deionized water.
5. Rinse the inner probe three times with new filling solution.
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