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This issue sponsored by Spitzer and Boyes, LLC

April 2018

The Fundamentals of Variable Area Flowmeters: Rotameters (Part 1)

The true rotameter differs from the orifice-and-plug variable area meter considerably. In a true rotameter, the walls of the measuring tube are tapered, and the float moves up and down in the tapered tube based on the flow through the rotameter. The float can be made in many shapes, from round to compound with sharp edges. Because the float is free inside the tube, it is very difficult to interface a true rotameter to a remote indicator or transmitter. click for more...

Steam Flowmeter Audit: Investigate the Problem

Last month I mentioned being asked to audit the flowmeters used to bill a chemical plant for its steam consumption. Satisfied with a review of the overall design, calibration and installation of the various steam flow measurement systems, I was able to focus on the symptom at hand: One of the differential pressure transmitters would be calibrated to be within its 'As Left' specification only to be consistently out of its 'As Found' specification during its next calibration approximately three months later. click for more...

Zeroing a Differential Pressure Transmitter

Should a differential pressure transmitter be zeroed after it is removed, calibrated in the shop and reinstalled in the same location? Why or why not? 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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