Learn from the best! Hone your knowledge of sampling system best practices, pick up time-saving tips, and download free articles packed with diagrams, illustrations and tips on ensuring accuracy in analytical instrumentation systems.
Make sure you measure the delay from the tap to the analyzer.
Process measurements are instantaneous, but analyzer responses never are. From the tap to the analyzer, there is always a delay. Time delay in sample systems is the most common cause of inappropriate results from process analyzers.
The way you calibrate the analyzer will determine the results it produces.
To calibrate an analyzer, a calibration fluid of known contents and quantities is passed through the analyzer. If the resulting measurements don't match the known quantities in the calibration fluid, the analyzer must be adjusted accordingly.
Deadlegs, permeation and adsorption can all wreak havoc on your sample.
If you want your analytical instrumentation system to give a reliable picture of the fluid in the process line, you need a good sample. If the sample gets altered anywhere in the process, the data from the analyzer won't be useful.
Four critical areas where samples can take too much time moving along
There is always a delay between the moment you grab a sample and the time you get a reading from your process analyzer. You might assume your time delay is one minute, which is the industry benchmark. But if your assumption is way off, your readings may no longer be relevant.
Gas travels faster at lower pressure, so a regulator can speed up a sample
We've written about the many causes of time delay in sample systems, and how that can hurt the results that come out of an analyzer. The industry standard to aim for is one minute from the process line to the analyzer, but many potential delays lurk along the way. View some tips.
Using best practices, you can avoid common issues
If your sample is liquid and the analyzer in your analytical system requires gas, the only option is to convert the liquid to gas. With vaporization, also known as flash vaporization, you aim to turn all the liquid into vapor instantly—without changing the composition.
Analyzers keep improving, but sampling systems have three strikes against them.
In the past 50 years, process analyzers of all kinds have gotten better and better, but sampling systems haven't. Many don't even fulfill their intended purpose, which is to deliver an uncontaminated, representative sample to the analyzer without excessive time delay.
We all make mistakes. But many mistakes are easy to avoid if somebody warns you.
Some mistakes are easy to spot, such as a fast loop flowing backward. Others are a matter of making the right adjustments in pressure and temperature. Still others have to do with failing to make sure that the materials in your components are properly matched to your sample fluid.
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