Analytical · Glossary

What is a pH Electrode?

glass and reference electrodeAnalytical

A pH electrode is a sensor with a pH sensitive glass membrane and a reference electrode, producing a voltage that depends on pH.

pH Electrode Explained

The glass membrane develops a potential that changes with the hydrogen ion activity of the sample. The reference electrode gives a stable comparison potential. Most process sensors combine both in one body.

Electrodes age, coat and dry out, so they need regular cleaning, calibration and replacement.

Calculators for pH Electrode

CalculatorpH Electrode CalibrationFree online calculator with formula and worked example.CalculatorpH CalculatorFree online calculator with formula and worked example.

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Free downloadpH Meter Calibration ProcedureFree step by step procedure, Word and PDF.

Frequently Asked Questions

What is a pH Electrode?

A pH electrode is a sensor with a pH sensitive glass membrane and a reference electrode, producing a voltage that depends on pH.

How long does a pH electrode last?

From weeks in harsh service to over a year in clean water; slope and response time show its condition.

Why must electrodes stay wet?

A dry glass membrane responds slowly and inaccurately until rehydrated.

Learn more on the blog

Electrical conductivity explained

A practical guide on instrumentationblog.in with more detail on pH electrode and how it is applied on real plants.

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