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In either case, various techniques can be used to reduce the noise component of the signal. One method is to dampen the signal. This method will usually work in most applications, because the noise will be reduced as the damping is increased. Also reduced is the ability of the instrument to measure the process in a timely manner because the response time of the damped instrument will increase.
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I recently read an interesting e-mail exchange that was originated by a person who was involved with a large (over 30-inch) orifice-plate flowmeter. He stated that ISO 5167 required 20 diameters of straight run upstream, but that the installation only allowed for 10 diameters. Approximately 5 percent accuracy was required, and the writer wanted to know how much the shortened straight run would affect the flow measurement and if repeatability would be good.
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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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