Dirt deposits of any kind on the membrane surface or the junction of your pH electrode may reduce the lifetime of the electrode, and cause it to provide inaccurate readings. It is best to clean your electrode chemically and not mechanically.

What do I do if my Water level electrode has dirt deposits outside of the electrode and the junction?

Dirt deposits outside of the electrode and junction can be cleaned in a couple of different ways:

Inorganic adhesions - Put the electrode for a couple of minutes into 0.1 mol/L HCl or 0.1 mol/L NaOH. If build-up still persists, the solution can be heated up to 50ºC (122ºF) before the acid or alkali concentration is increased.

Organic adhesions - Rinse the electrode with organic solvents. Wipe the membrane gently with a damp, lint-free soft cloth or Kimwipe.

Proteins - Place the electrode in a pepsin/HCl solution for a minimum of 1 hour.

Sulfides - Store your electrode in a 7.5% 0.1 mol/l HCl solution until the discoloration on the junction has vanished. After cleaning, rinse the electrode with deionized water and place it in the electrolyte solution for a minimum of 1 hour. Be sure to recalibrate the electrode before taking your next measurement.

How do I clean the reference electrode with liquid electrolyte?

To clean your reference electrode, using liquid electrolyte, remove the old electrolyte and replace/refill it with new electrolyte. Repeat this process until the dirt is removed.

If you find KCl crystals in the interior of your electrode, heat the electrode in a water bath at 45ºC (113ºF) to dissolve the crystals. After the water bath, replace the old electrolyte with new.

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