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DAVID W. SPITZER'S E-ZINE

TECHNICAL AND MARKETING SERVICES
FOR INSTRUMENTATION SUPPLIERS AND END-USERS

This issue sponsored by Spitzer and Boyes, LLC

February 2012

Fieldbus Wiring (Part 1 of 2)

In the wiring of 4-20mA analog, there is a requirement for a continuous wire pair from the field instrument to its final terminations at the analog input card in the control system. The same 4-20mA current indicating the process variable or measurement value can be measured anywhere on this wire pair. click for more...

Diagnosing an Incorrect Measurement:
Why a New Insertion Vortex-Shedding Flowmeter Failed to Perform

A client recently queried me about the installation and operation of a new insertion vortex-shedding flowmeter. The flow measurements were suspect because they were approximately half of the flowrate expected by the plant. click for more...

Selecting a Flowmeter for Stack Gas Flow Measurement

Which of the following flowmeters cannot be used to measure the flow of gas in a stack? click for more...

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ABOUT SPITZER AND BOYES, LLC

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.

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