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Ultrasonic Flowmeters (Part 1 of 4) by David W Spitzer and Walt Boyes

The flowmeters considered herein are flowmeters that use ultrasonic energy as their primary flow measurement technique. Therefore, a common class of "ultrasonic flowmeters" comprised of an open channel flowmeter (such as a flume or weir) that incorporates an ultrasonic level measurement is specifically excluded from this discussion.

Ultrasonic flowmeters use sensors to generate ultrasonic waves and direct them into the flowing stream. Information from the remnants of these sound waves is used to determine the flow of fluid passing through the flowmeter. Ultrasonic flowmeters have no moving parts.

Sewage District Installs New Flowmeters by David W Spitzer

Previous articles described the sewage collection systems for two adjacent sewage districts where the flow measurements used to allocate expenses and bill one of the sewage districts flowmeters was questioned in court. As a legal matter, the court decided that my testimony did not reveal that anything had changed with regard to the flowmeters so the second sewage district was not instructed to correct their deficiencies. In other words, the court allowed the second sewage district to knowingly overbill the first sewage district.

Calculating Flow Error for Pressure Transmitter Installation and Calibration by David W Spitzer

An orifice plate is sized to produce a differential pressure of 0 to 100 inches of water column (WC) corresponding to zero to full-scale flow respectively through a nominal 200# steam header where the flowmeter is located approximately 25 feet above grade. A pressure transmitter calibrated for 0 to 300 psig will be installed and used to pressure compensate the flow measurement. The pressure and differential pressure transmitters will be mounted on pipe stands for convenient access. What is the approximate flow error associated with the pressure transmitter installation and calibration?


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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