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DAVID W. SPITZER'S E-ZINE

TECHNICAL AND MARKETING SERVICES
FOR INSTRUMENTATION SUPPLIERS AND END-USERS

This issue sponsored by FlowMeters.com

JANUARY 2009

Vortex Shedding and Fluidic Flowmeter Applications (Part 1 of 4)
Spitzer and Boyes, LLC

In general, vortex shedding and fluidic flowmeter applications include liquids, gases and vapors where it is acceptable to not measure low flow rates because the flowmeter turns off at low fluid velocity and at low Reynolds number. This should be well understood and quantified because failure to measure low flow rates can adversely affect many processes. click for more...

Sound Wave Principles:
Life Would Be Simpler if There Were Fewer Complications

CONTROL (December 2007)

The same is true for ultrasonic flow measurement. Wouldn’t it be great if you could clamp a sensor onto the pipe and measure the flow through the pipe? Benefits would abound-including not having to shut down the flow or cut the pipe. Installation would be faster and easier. Unfortunately complications tend to get in the way of this smooth-flowing scenario. click for more...

How Pressure Variations Affect Flow Measurement
Flow Control (January 2008)

A flow control loop consisting of a flowmeter, controller, and control valve is used to control the flow of a gas to a process. Measurements from a pressure transmitter installed some time ago indicate the incoming air pressure is typically two bar, but that it can vary from one to 2.5 bar due to process upsets that occur upstream. How will these pressure variations affect the flow measurement, assuming the flowmeter is calibrated to operate at two bar? click for more...

 

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ISSN 1538-5280
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