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This issue sponsored by Spitzer and Boyes, LLC

September 2018

Flowmeter Quirks: Why Is My Flowmeter Not Reading Right? (Checking Accuracy)

There are a few ways to see for certain if a flowmeter is working correctly in an installation. The first is to do a volumetric drawdown test. You must capture all of the flow through the meter and direct it to a tank, or a tank truck, or some other means of capturing a sizeable quantity of flow. Best, if possible, is to use a tank truck, and take it to a scale. Weigh the truck empty for tare, then weigh it full of fluid. Many people can't do this test. It isn't easy to do. If you have a sump, clearwell, wetwell or stationary tank that you know the volume of very accurately, you can do the same thing by level and calculator. If the value on the flowmeter reads within about five percent of the value you obtain, the flowmeter is working right. click for more...

Viscous Flow Measurement

If you attend one of my flow measurement seminars, you will hear me say various times that the viscosity of a fluid is the ability of the fluid to flow over itself. Water has a viscosity of approximately 1 centipoise and flows easily over itself. More viscous fluids such as honey have higher viscosities. The actual viscosity of the fluid is dependent upon its temperature - where viscosity decreases (often dramatically) with higher temperature. Comparing the ability of cold and hot honey to flow illustrates this relationship. click for more...

Approximate the Viscosity of Honey

What is the approximate viscosity of honey in centipoise (cP)? click for more...



In addition to over 35 years of experience as an instrument user, consultant, and expert witness, David W Spitzer has written over 10 books and 250 articles about flow measurement, level measurement, instrumentation, and process control. David (with Walt Boyes) is the author of seven Consumer Guides to various industrial flow and level technologies. David teaches his flow measurement seminars in both English and Portuguese.

Spitzer and Boyes, LLC provides engineering, technical writing, training seminars, strategic marketing consulting, distribution consulting, and expert witness services worldwide, and can be contacted at +1.845.623.1830 or www.spitzerandboyes.com.


ISSN 1538-5280
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