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DAVID W SPITZER'S E-ZINE (September 2021)


Contact Level Measurement System Performance (Part 3 of 3)    by David W Spitzer

percentage of set range statement describes a parameter that is in error by a constant percentage of the set range of the transmitter. The transmitter set range can be thought of as the coarse span of the transmitter. 

Flowmeter Billing Errors (Part 4) by David W Spitzer

A previous Application Corner column described a legal case where a steam producer alleged that its boiler steam flowmeters were not accurate because they had not been inspected in 50 years and not been calibrated in seven years. Despite restrictions on the scope of information that we could legitimately request from the steam producer, carefully crafted document requests and site visits provided sufficient information to be able to determine the type of water treatment system that was installed from which the flow measurement data could be evaluated for reasonableness.

Tank Level Calculation by David W Spitzer

A differential pressure level transmitter is located 3 feet (36 inches) below the tangent line of a round flat bottom water tank that is 30 feet (360 inches) tall and vented to the atmosphere. Approximately what is the tank level when the measured differential pressure is 66 inches of water column?


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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