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In the past 50 years, process analyzers of all kinds have gotten better and better, but sampling systems have not. This is a strange set of developments. Many process analyzer sampling systems in today's plants are not fulfilling their intended purpose, which is to deliver an uncontaminated, representative sample to the analyzer without excessive time delay.

The result is compromised or inaccurate analyzer readings and, by extension, chemical and petrochemical products that are not within specifications. There is also the potential for safety issues associated with improperly designed sampling systems.

We've curated a three part series of whitepapers, Ensuring an Accurate Result in an Analytical Instrumentation System, to help you improve the health of your sampling systems and maintain representative product samples.

Part 1: Understanding and Measuring Time Delay

Process measurements are instantaneous, but analyzer responses never are. From the tap to the analyzer, there is always a delay. Unfortunately, this time delay is often underestimated or not accounted for or understood. Time delay in sample systems is the most common cause of inappropriate results from process analyzers.

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Part 2: Calibrating the Analyzer

In many analytical instrumentation systems, the analyzer does not provide an absolute measurement. Rather, it provides a relative response based on settings established during calibration, which is a critical process subject to significant error.

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Part 3: 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.

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