When should the filling hole on a refillable electrode be open or plugged?

Document ID

Document ID TE7241

Published Date

Published Date 07/12/2021
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Question
When should the filling hole on a refillable electrode be open or plugged?
Summary
When and when not to plug the fill hole on a refillable electrode.
Answer
When a probe is used for measurement or calibration, the internal electrolyte will flow through the junction and into the sample or standard. During measurement or calibration the fill hole should be open. If left closed, it will cause a head pressure to build up, preventing the flow of this electrolyte. (Just like covering the opening of a submerged straw with a finger and removing the straw from the liquid. The liquid stays in the straw until you remove your finger and equalize the pressure inside the straw.)

Most probes have some film covering the fill hole when they are first received; removing it is required for a probe to fully function.

In-between use, the fill hole should be plugged to restrict internal electrolyte flow and help prevent it from dehydrating.

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