Sampling systems - the options
What is the accuracy of different sampling systems and which is best for your application?
There are two main types of sampling systems, probe based systems and bypass loop sampling systems. In probe-based systems the sample is taken inside the pipeline and in a bypass loop system the sample is taken from a 1" or 2" bypass loop flowing isokinetically with the main pipeline flow.
Probe based systems tend to be lower cost and accuracy and have a higher measurement uncertainty and maintenance cost. They also have a higher dead volume which can lead to batch cross contamination. Bypass loop systems tend to be more expensive, but more accurate, easier to maintain and have a lower measurement uncertainty and dead volume.