OPSIS - Model 400CS -Cross-Stack System

System 400CS ("cross-stack") is a cost-effective, high-performance monitoring system developed to monitor the concentrations of gaseous substances at power plants and other sites. In the basic version (e.g. System 400BASIC), the measurements are based on UV-DOAS technology, which makes it possible to monitor a wide range of gaseous compounds. An analyser of the AR600 model evaluates light from a monitoring path that runs straight through the gas channel. The monitoring method is also called "in-situ". Examples of substances that can be monitored are NO, NH₃, SO₂, Hg, and NO₂. The 400CS system can be supplemented with an AR650 analyser using FTIR-DOAS technology. This allows the measurement of more gaseous substances, such as CO, CO₂, HCl, and HF. The illustration shows a System 400CS with both AR600 and AR650 analysers.