System 400HWE Hot Wet Extractive is based on OPSIS UV/FTIR DOAS system giving fast response and best possible performance for all gases. The high resolution FTIR system is free from interference from all gases including water.

The UV measurements of NO, NO2, SO2, and Hg gives outstanding performance. An ejector pump is used to move the gas sample from the stack into the measurement cell via a heated sample line. One analyser cabinet can operate several measurement cells using an optical multiplexer. A single System 400HWE will measure all relevant gases for CEM applications such as NO, NO2, SO2, NH3, CO, CO2, HCl, HF, N2O, CH4, H2O, O2, and Hg.

Total mercury can be measured as an option using a separate measurement cell and a converter that converts all mercury species into elementary mercury. The System 400HWE is designed to be used in clean gas applications.