Check this website for original  post and more info : https://www.youtube.com/user/AppliedAnalytics

     The TLG-837 Tail Gas Analyzer is used to measure hydrogen sulfide (H2S), sulfur dioxide (SO2), and the required air demand in the Claus process. This demo covers the analyzer unit, the patented demister probe, and the optional utility control panel. Check this website for original post and more info : https://www.youtube.com/channel/UC6PHeBi3oWS46gOzkjnqTaA