Flowmeter Accuracy Vs. Repeatability

Although some believe that good repeatability is a measure of accuracy, this is a misconception. Repeatability is in no way an accuracy guarantee. Therefore, when considering a measurement device such as a flowmeter, if you see only a repeatability statement and no accuracy statement, be cautious and consider your application. Repeatability is the ability of […]

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Selecting A Flow Meter For Pressurized Systems

It’s easy to choose the wrong flow meter. There are many different meter technologies on the market today, all with their own strengths and weaknesses. These variations in functionality and performance are very important to consider when selecting the most appropriate measurement device for your system. The level of accuracy and performance that operators prefer […]

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Truth in Specsmanship, Part 3

This time I will review the specsmanship of a single turbine insertion style meter. Its manufacturer infers the meter’s performance by once again mixing and matching information in an attempt to project its capabilities beyond what is possible, with regard to the meter’s accuracy specifications. On the product’s specifications document the manufacturer lists the meter’s […]

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Truth in Specsmanship, Part 2

This installment of “Truth In Specsmanship”  will examine the insertion magmeter technology as it relates to turndown. Turndown is the operating range of a given meter, based on the maximum operating velocity, divided by the turndown factor. For example, suppose a meter has a maximum operating range of 30 ft/s and a turndown of 100:1. […]

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Truth in Specsmanship, Part 1

Most of today’s flow technologies (paddle wheel, turbines, orifice plates, variable area, pitot tube, vortex, and magnetic) are volumetric, meaning that these devices measure velocity and then calculate volume by using a known cross section area (Velocity (feet/second) x Area (Ft2) = Volumetric flow rate (ft3/s)). In all cases, the higher the velocity the easier […]

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