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This issue sponsored by Spitzer and Boyes, LLC

January 2013

Capacitance Level Measurement Technology (Part 3 of 3)

Relative immunity to variation in electrical properties can often be achieved by knowing the range over which the electrical conductivity or dielectric constant can vary in a given application in conjunction with selecting a sensor that is relatively immune to the property changes encountered. click for more...

Success at Last:
It Took a Few Years But The Variable Speed Drive Was Justified

Over the past couple of months, I was irked that the extractor feed pump operated at full speed with its flow being throttled by a control valve located in plain sight approximately 1 meter above the pump discharge. It seemed straightforward to me that it would be much more efficient to reduce the pump speed so that the pump output could match its load, thereby eliminating not only the dissipation of hydraulic energy across the control valve, but eliminating the control valve entirely. click for more...

Upstream Straight Run Obstructions

The performance of most flowmeters can be adversely affected by a distorted velocity profile at the flowmeter inlet. One method to improve the velocity profile at the inlet of the flowmeter is to install straight run upstream that allows velocity profile distortions to dissipate prior to entering the flowmeter. To achieve this end, the upstream straight run should not contain any obstructions to flow. 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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