The emf generated by a pH sensor changes DEPENDING on the temperature of the test solution. This is because the potential generated on the glass membrane of the pH sensor is proportional to absolute temperature T as represented by Nernst’s EQUATION. Temperature compensation is done to compensate these temperature-based changes in the emf with the pH ANALYZER (or pH transmitter) so that it is independent of temperature. Note that this temperature compensation is unrelated to changes in the pH value of a test solution caused by temperature.

Some pH meters measure temperature with an RTD incorporated in a pH sensor to automatically conduct temperature compensation of the generated emf of the pH sensor.

The emf generated by a pH sensor changes depending on the temperature of the test solution. This is because the potential generated on the glass membrane of the pH sensor is proportional to absolute temperature T as represented by Nernst’s equation. Temperature compensation is done to compensate these temperature-based changes in the emf with the pH analyzer (or pH transmitter) so that it is independent of temperature. Note that this temperature compensation is unrelated to changes in the pH value of a test solution caused by temperature.

Some pH meters measure temperature with an RTD incorporated in a pH sensor to automatically conduct temperature compensation of the generated emf of the pH sensor.