Investigation of a Simplified Photometer Design for the Measurement of Ozone Gas Concentration

Ozone is used in medicine, water treatment, and chemical processes. Measuring its concentration is essential, especially in medical technology, to enable safe and reliable treatment for the patient. The photometric measurement principle is promising because it can be applied at room temperature and it has a fast response time. Since the application range of commercial photometers for ozone gas is still limited due to the high price of these instruments, here a simplified low-cost photometer set-up is presented. The set-up measures at a wavelength between 275 nm and 286 nm ozone concentrations up to 2.5 vol% (25000 ppm) with a response time of 210 ms and consists of low-cost components. The accuracy of the photometer in comparison to a reference analyser is 2.5%. Hence, the simplified concept outlined in this paper provides a basis for the development of compact and cost-effective photometers for ozone gas measurement.