The first commercially available glass membrane pH sensors were launched to the marketplace in the mid-1930s. The sensors of today still rely on the same design principles as these first products.

A Basic pH Measurement System Consists of:

  1. The Measurement Electrode
  2. The Reference Electrode
  3. A High Impedance Voltmeter

This series of articles will explore the millivolt output signal as well as each physical component of the pH sensor measurement chain. Understanding the design of the sensor is a basis for learning why pH sensors have different features based on the application they are used in.

pH measurement guide cover

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Get a better understanding of pH measurement in Hamilton’s comprehensive pH Measurement Guide.