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The Sentinel Virtual Tail Gas Analyzer is a system for analyzing the composition of H2S and SO2, their ratio and the determination of air demand, in the tail gas or residual gas in a Claus plant.
TailGasVASentinel is based on a model of the plant and some algorithms that allow the parameters mentioned above to be inferred from process variables available from a Sulfur Recovery Unit (SRU) in the control system, such as pressure, temperature and flow rates, without the need for an expensive physical analyzer, or in some cases serving as backup to it.