January 2001

Process Analyzers

Get the most out of your NIR analyzers

Follow these application, selection and installation guidelines

Barsamian, A., Refinery Automation Institute, LLC

Near infrared (NIR) analyzers provide almost instantaneous multiproperty analysis by shining near infrared light through the process fluid and subsequently mathematically interpreting the resulting spectrum (Fig. 1). Compared with conventional analyzers, NIRs are fast, highly accurate and repeatable, replace multiple process analyzers, have very high hardware reliability, require very low mechanical and electronic maintenance, can handle cheaply multiple process streams via fiber optics multiplexing and can be installed quickly and easily in the field. On the other hand, NIR is a correlative measurement, not an absolute primary measurement, so accuracy depends on the quality of cor

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