Anywhere there is a wet stack with acid gas emissions there will be problems trying to continuously monitor them. The GS1 overcomes the problems of corrosion and condensation by using a sophisticated dryer that selectively removes water vapour leaving behind the gas of interest in the sample stream for measurement by an electrochemical sensor. By utilising specific materials and by achieving all of this with no moving parts Process Instruments have created a reliable, and accurate monitor of acid gases in wet stacks. The GS1 Wet Stack Emissions Analyser comprises three parts; the probe (including sample line), the main unit, and the Crius electronics.