Ozone generators are designed to produce a continuous flow of ozone. The ozone gas is designed for calibration of field and laboratory ozone analysers in water purification and air pollution applications. It utilizes the photochemical reaction of oxygen under shortwave UV to produce a continuous flow of ozone. Generators are a stable source for instrument development and an oxidant source for aging and oxidant testing of materials. Low-maintenance systems eliminate inconvenient extended downtime.