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Folded-Path Gas Analyzers: TDLs for Process Measurements
In petrochemical plants and refineries, tunable diode laser (TDL) gas analyzers are becoming an increasingly common sight. Their high reliability and low maintenance has made them the gas analyzer technology of choice for many companies. Installing a cross-stack TDL directly in a process pipe or vessel creates some installation and operational challenges and limitations which need to be considered carefully before considering their deployment. This white paper examines influences on the light beam and alignment of typical cross-pipe TDLs and contrasts that with the versatility of folded-path TDLs.