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PinPoint Precision - Sam Miller, SpectraSensors Inc., USA, examines how a TDL based analyser pinpoints moisture intrusion and trace H2S levels in refinery operations.

  The emergence of tunable diode laser (TDL) based technologies has been a major development in many industries, and has created valuable opportunities for refineries and chemical plants to maximise productivity while avoiding high maintenance costs.   By instantly and accurately pinpointing the presence of moisture, HCl, H2S and other impurities in feedstock and fuel gas streams, the TDL based gas analyser is able to provide significant benefits. Among those are the prevention of foreshortened lifespan of costly catalysts, enhanced assurance of product quality, reduced turnaround recovery times, and avoidance of unscheduled shutdowns.   What is a TDL? A tunable diode laser is a type of semiconductor based laser that can be tuned to optically select a very specific wavelength (or colour) of light. NASA’s jet propulsion laboratory (JPL) developed long wavelength (near infrared) tuneable lasers and processor controls that …