The Cerex UV Sentry operates using a technique known as UV-DOAS (Ultra Violet Differential Optical Absorption Spectroscopy). A beam of ultraviolet light is sent from the UV Sentry through the open air, and through any ambient gas samples, to a retroreflector array up to 1300 meters away. The light is then reflected by the retroreflector array and returns to the UV Sentry.
Due to a physics principle known as the Beer-Lambert Law, and algorithms within Cerex’s software, the gas samples that the light passed through on the way back to the UV Sentry is converted into useable data. Gas samples are identified and quantified in real-time, and can be viewed remotely anytime, anywhere.
Combining the UV-DOAS technique with parts per trillion to parts per billion detection limits makes the Cerex UV Sentry one of the most affordable and accurate solutions for perimeter & fenceline monitoring. Dozens of gases and compounds can be monitored within the UV light spectrum, notably Benzene and Chlorine, for a valuable low-cost solution.