Ozone Meters for Gaseous and Aqueous Applications

Two inexpensive technologies exist to detect ozone. They are electrochemical and heated metal oxide semiconductor (HMOS).

An electrochemical ozone sensor uses a porous membrane that allows ozone to diffuse into a cell containing liquid or gel electrolyte and the electrodes. When the gas comes into contact with the electrolyte, a change in electrochemical potential between the electrodes is produced. Associated electronic circuitry will amplify, and control the signal. The signal is proportional to the ozone concentration (partial pressure) and is displayed in PPM or PPB.

HMOS
A heated metal oxide semiconductor (HMOS) sensor works by heating a small platinum substrate to a 300-deg F temperature. At this temperature, the substrate is very sensitive to ozone. A proportional signal is sent to the electronics and displayed in PPM or PPB.