Challenges in Gas Mixing and Dilution Applications

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Gas mixing is a science that can present new challenges, even if you think you’ve seen everything. Having the right equipment alleviates many problems, since the end product can suffer if the mixing setup is subpar. It helps to understand the role of each component in a mixing system and how it can improve your process. Starting at the beginning of the process, here are some of the challenges that may arise, and suggestions to help make your gas mixing ...

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How Accurate Are Multi-Gas Calibrations?

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When you switch from flowing one gas to flowing a different gas in the same flow meter, are the new measurements with the new gas just as accurate as the original calibration gas? As the originator of multi-gas flow meter calibrations some 20 years ago, Alicat is asked this question often. In this post, we’re going to look at Alicat’s approach to gas selection and why you experience no change in accuracy when you change gases on an Alicat mass flow ...

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Even faster leak checking using pressure control loop on MFC

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A pressure decay test can take a while, and waiting time is wasted time.

In this video, we demonstrate Alicat’s mass flow controller simultaneously controlling the pressure in the device under test, and monitoring leak rates as low as 2.5 sμlm. The result is an instant quantification of a leak rate, as soon as your system is settled at the target pressure. Nor do you need to do a lot of math to find an average leak rate—you’ll know the leak ...

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Considering Hysteresis in Mass Flow Meter Selection

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Alicat’s mass flow meters and mass flow controllers are renowned for their speed and accuracy, but how important is our speed to your accuracy? In this article, we look at hysteresis and its effects on common types of mass flow instruments.

Hysteresis reduces your measurement accuracy by causing your meter to respond differently to repeated identical inputs. What is hysteresis? In simplified terms, hysteresis is the tendency of a system to react differently to the same input based on its history ...

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Flow metering and control for high pressure flow systems

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There are times when a high operating pressure is needed, and now you can use an Alicat for that high pressure system. It means you can take advantage of all the Alicat benefits you love so much: changing gas types on the fly, multivariate displays, and the controls and speed you depend on for a stable, repeatable process.

You can take a look at the new MQ meters and MCQ controllers for high pressure flow systems on the respective Alicat Continue Reading →

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Mass flow measurement techniques across the spectrum

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A few flow measurement principles dominate the flow technology landscape, but there’s a rich variety of ways to measure flow that might not make themselves apparent without a bit of research. Anyone who works with flow is likely to be familiar with thermal flow meters, differential pressure-based flow instruments, and rotameters, so here is a look at a few flow technologies you may hear less about, depending on your specialization.

Ultrasonic:

Doppler flow meterUltrasonic flow ...

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Flow Meter Accuracy: Demystifying Spec Sheets

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Accuracy is the very first specification listed on a mass flow meter spec sheet because measuring flow is the whole point. But flow meter accuracy specs can be confusing, and that can lead to difficulty in evaluating the equivalence of options. Alicat’s standard accuracy specification is plus or minus 0.8% of reading plus 0.2% of full scale. Add them together, and they equal 1% at full scale. Other manufacturers list only a percent of full scale, or some other ...

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Faster Flow Calibration for Gas Analyzer Audits

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Alicat’s “Whisper” series portable flow meters reduce the time it takes to conduct flow calibrations and audits of gas analyzers and gas dilution calibrators used in ambient air monitoring and other applications.

Auditing Gas Analyzers and Gas Dilution Calibrators

Flow calibrating a gas analyzer can consume your entire day. Most dreaded are low flow calibrations, which can take an hour or two alone. You watch the bubble or piston slowly rise to the top of the positive displacement tube at a pace of 10 ...

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How to choose meters and controllers for pressure or flow

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Alicat devices are available in thousands of possible configurations to ensure that the instrument you receive is the right fit for your application. In this first of a new series of blog posts centered on our available instrument options, we will be taking you through the main product categories in greater detail.

Gas Flow Measurement and Control

Alicat low-flow mass flow meter

If you are looking for precision gas flow instrumentation, then we’ve got ...

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LabVIEW Pressure Control Makes for Easy Medical Device Flow Characterization

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LDIT-logoLD Integrated Technologies is a consulting firm that specializes in system integration and automated testing projects. The firm often develops custom hardware, circuit design, embedded firmware and software to meet the needs of their customers. LDIT focuses especially on integration projects within the medical device, aerospace, manufacturing, automotive and oil and gas industries.

LabVIEW Pressure Control Makes for Easy Medical Device Flow Characterization

LD Integrated Technologies was working with a ...

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