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Technology for controlling molecular sieve beds Proper molecular sieve dehydration system operation is critical to operating any natural gas processing or LNG plant. The process hinges on the analyzer that tests the desiccant dryer outlet gas for moisture content. A bad measurement can be a major economic blow or even force a shutdown of the plant. In response to this need, some plant managers are turning to tunable-diode laser (TDL) analyzers. SpectraSensors in Houston, Texas has provided over 90% of installed extractive TDL analyzers. Since a laser beam is used, there is no physical contact between the gas stream and the sensor. The measurement result is fast and accurate, and analyzer