December 2009

Process Analyzers

Fine tune accuracy in analytic measurement - Part 3

Follow these steps to avoid compromising a sample

Nordstrom, D., Waters, T., Swagelok Company

  The objective of an analytical instrumentation (AI) system is to provide a timely analytical result that represents the fluid in the process line at the time the sample was taken. If the AI system alters the sample so the analytical result is changed from what it would have been, then the sample is no longer representative and the outcome is no longer meaningful or useful. Assuming the sample is properly taken at the tap, it may still become unrepresentative under any of the following conditions: • Deadlegs or dead spaces are introduced at inappropriate locations in the AI system, resulting in a "static leak," which may cause bleeding or leaking from the old sample into the ne

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