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DAVID W SPITZER'S E-ZINE (November 2023)


Non-Contact Level Gauge Performance (Part 3 of 4) by David W Spitzer and Walt Boyes

percentage of maximum span statement describes the error in terms of the maximum sensor distance minus the blocking distance. For example, the stated accuracy of a level measurement system with a sensor that can measure from 400 mm to 8000 mm might be +/-1 percent of the maximum span.

Multivariable vs. Single Variable DP Transmitters: Dispelling Common Myths About Instrument Accuracy by David W Spitzer

Paradigms abound in the world. For example, for centuries we thought that the earth was flat and the sun rotated around the earth. Doctors used to bleed patients to promote healing. One instrumentation paradigm that is occasionally heard is that multivariable differential pressure transmitters that measure pressure, temperature and differential pressure are more accurate than three individual transmitters measuring the same parameters.

Which Flowmeter Shows Lowest Pressure Drop In Gas Service? by David W Spitzer

Many processes can tolerate only a small pressure drop across a flowmeter. For example, many ventilation ducts operate at a pressure of only a few millimeters of water column. In these applications, flowmeter selection can be predominately predicated on the pressure drop across the flowmeter. Which of the following flowmeter technologies exhibit the lowest pressure drop for gas service?


In addition to over 40 years of experience as an instrument user, consultant and expert witness, David W Spitzer has written over 10 books and 500 articles about flow measurement, level measurement, instrumentation and process control. David teaches his flow measurement seminars in both English and Portuguese.


Spitzer and Boyes, LLC provides engineering, technical writing, training seminars, strategic marketing consulting and expert witness services worldwide.


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