View OPSIS AB on TEKEN44The ANALYSERS - THE CORE OF the Monitoring SYSTEMS Each monitoring system is built around an analyser. Its task is to measure the absorption of certain wavelengths of light coming from the monitoring path, and use this to calculate the levels of various compounds, such as NO, NH3, NO2, SO2, O3, benzene, toluene, styrene, and formaldehyde. The AR500 is the most common type of analyser. It operates in the ultraviolet wavelength range and the technique is then called UV-DOAS. When monitoring in the infrared range, an AR550 analyser based on FTIR-DOAS technology is often used. In some cases, IR measurements can also be made with an analyser that is essentially of the UV-DOAS type. It is then called AR520. Each individual analyser is adapted to monitor the levels of the specific substances required. Two analysers of the same type can therefore have completely different monitoring capabilities.
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