Maintaining a Representative Sample
The objective of an analytical instrumentation (AI) system is to provide a timely analytical result that is representative of 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...
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