Myron L and Sensorex Combination-Differential Sensors

Combination pH Sensors

The most common method of measuring pH is to use an electrochemical pH sensor. Combination pH sensors are a type of electrochemical pH sensor that features both a measuring electrode and a reference electrode. The measuring electrode detects changes in the pH value, while the reference provides a stable signal for comparison. A high impedance device, known as a pH meter, is used to display the millivolt signal in pH units.

Differential pH Sensors

Compared with a typical combination pH probe, differential pH sensors work slightly differently. While combination pH sensors have two electrodes, a measuring, and a reference electrode, differential pH sensors have three electrodes. In the differential design, two electrodes measure pH differentially with respect to a third metal ground electrode. This design has the advantage of preventing reference fouling, making it ideal for industrial applications like wet scrubbers.