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Evolution of Thermal Mass Flow Meters

A Historical Perspective from Sierra Founder Dr. John Olin

John Olin, founder and CEO of Sierra Instruments, Inc., in Monterey, California, provides a historical perspective on the development of thermal mass flow.

Thermo-Systems, Inc. (TSI) began in its founder’s basement in 1959, with a cooled-film anemometer designed for transient measurements in high temperature fluid flows. This led to TSI’s hot-film and hot-wire anemometers, the first commercial products of this type. These immersion-type devices were used mainly as research instruments, many related to environmental pollution.

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