Question
What is the procedure for replacing the filling solution in a refillable pH probe?
Summary
Instructions for replacing pH probe filling solution.
Answer
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Remove old/contaminated filling solution in the probe by tilting the solution back towards the filling hole, a pipet such as Pipet, Sterile, Transfer, 15/pk (Product # 2232512) may be used to remove the solution.
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Using a transfer pipette, add some deionized (DI) water, such as Water, Deionized, 100 mL (Product # 27242) to the probe through the filling hole.
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Shake the probe to rinse off the inside of the probe with the DI water.
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Use a transfer pipette to remove the DI water in the same way the filling solution was removed.
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Repeat steps 2-4 two additional times.
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Add a small amount of filling solution (See What is the correct storage (and filling) solution for an IntelliCAL™ pH probe?).
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Shake the probe to rinse off the inside of probe of residual DI water with the filling solution.
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Remove this small amount of filling solution with a transfer pipette.
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Refill fully with fresh filling solution.
