The Definitive Guide to pH Probes:
Part 1 “Refilling Sensors”

The Definitive Guide to pH Probes: <br>Part 1 “Refilling Sensors”
Authored By TPS Website

Are you looking for a reliable guide on pH probes? Look no further – this guide will cover everything you need to know about pH probes, from how they work to the different types available. Whether you’re a beginner or an experienced user, we’ve got you covered!

One of the most common pH probe faults involve empty electrolytes in your sensors. For example (shown above) a standard sensor with low solution. The rate of electrolyte depletion depends on the design of the probe you have and usage. Some refillable types are designed to leak electrolyte quite quickly and so need to be topped up periodically.

Symptoms of “Empty Electrolytes”

  • Slow response
  • Drifting pH reading
  • Incorrect pH readings

How to fix these issues?

  1. Refill electrolyte. With some specialty probes, the electrolyte chamber can be removed, if so clean it first with DI water and then refill the electrolyte.
  2. Replace probe. For standard probes without a refill cap, the probe must be replaced once the filling solution has become depleted. (Shown below)
  3. Refill probe. Single junction refillable probes can be refilled by opening the cap and filling with the correct filling solution. (Shown below)
  4. Clean out old solution. For a TPS Intermediate Junction probe, clean out the old solution and refill with IJ 3.5M KCL Gel.

Extra help:
Different probes and applications can require different filling solutions. If unsure, consult the manual or speak to TPS or the manufacturer of the sensor.

Refilling glass type pH sensor

Refilling Intermediate Junction type pH sensors


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