Sampling System Best Practices

Browse and download Swagelok technical articles on analytical instrumentation

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.


ENSURING AN ACCURATE RESULT IN AN ANALYTICAL INSTRUMENTATION SYSTEM, PART 1

Measuring Time Delay

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.

ENSURING AN ACCURATE RESULT IN AN ANALYTICAL INSTRUMENTATION SYSTEM, PART 2

Calibrating the Analyzer

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.

ENSURING AN ACCURATE RESULT IN AN ANALYTICAL INSTRUMENTATION SYSTEM, PART 3

Maintaining a Sample

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.

UNDERSTANDING TIME DELAY: FOUR MAIN AREAS TO INSPECT

Reducing BottleNecks

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.

USING A REGULATOR TO REDUCE TIME DELAY IN AN ANALYTICAL SYSTEM

Speeding Up a Sample

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.

HOW TO MANAGE VAPORIZATION IN AN ANALYTICAL SYSTEM

Tips on Vaporization

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.

WHY SAMPLING SYSTEMS HAVEN'T IMPROVED: THREE MAIN REASONS

An Ongoing Challenge

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.

TEN SAMPLING SYSTEM MISTAKES HARMING YOUR OPERATION

Addressing Mistakes 

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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