The Definitive Guide to pH Probes:
Part 5: "Dry Reference Junction"

The Definitive Guide to pH Probes: <br>Part 5: "Dry Reference Junction"
Authored By TPS Website
In today's post we deal with another common problem with pH probes known as 'Dry Reference Junction'. When a reference junction dries out it can become “blocked” by crystallised salt. It's important to note, there are other types of blocked junctions, which we will be covering in future posts.

This issue is usually caused by not using a wetting cap, or the solution in the wetting cap leaking/drying out. Professionals know that a dry reference junction can often be rectified by re-hydration. So just how do you fix this?


How to fix regular electrodes:

Salt Deposits: Dissolve the deposit by immersing the electrode in 0.1 M HCl for five minutes, followed by immersion in 0.1 M NaOH for five minutes, and then give it a thorough rinsing with distilled water.

Check the solution inside the probe, if there are large air bubbles etc, the probe may not perform correctly.

How to fix premium / IJ sensors:

For a Premium or TPS IJ sensor, simply remove the sleeve, clean up crystals with distilled water on the sleeve and the probe. Be careful with the glass tube and its green membrane tip as these are fragile to knocks and bumps.

You can check other the other Definitive Guide to pH Probes on our news page....

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