منابع مشابه
Frequency response of variable orifice type peak flow meters: requirements and testing.
Little is known about the response of variable orifice peak flow meters to high frequency flow input. The purpose of this study was to define and test dynamic requirements for such peak flow meters. In a population sample we measured peak expiratory flow (PEF), rise time (tr), from 10-90% PEF and the duration of the flow in excess of 97.5, 95 and 90% of PEF, by use of a carefully calibrated Fle...
متن کاملFundamentals of Multipath Ultrasonic Flow Meters for Gas Measurement
This paper outlines the operating principles and application of ultrasonic gas flow metering for custody transfer. Basic principles and underlying equations are discussed, as are considerations for applying ultrasonic flow meter technology to station design, installation, and operation. These applications are illustrated based on operating experience with the SICK ultrasonic flow meter, however...
متن کاملFundamentals of Multipath Ultrasonic flow meters for Gas Measurement
This paper discusses fundamental principles of ultrasonic gas flow meters used for measurement of natural gas. A review of an ultrasonic meter’s operation and the equations used to determine actual volumetric flow is presented. The ultrasonic flow meter’s diagnostic capability will also be briefly presented. Further, diagnostic data, in conjunction with gas composition, pressure and temperature...
متن کاملProving Liquid Ultrasonic Flow Meters for Custody Transfer Measurement
Liquid ultrasonic flow meters (LUFMs) continue to gain popularity in petroleum measurement with the promise of high accuracy and low maintenance. These are favorable features, but because of the high volume and value of petroleum products, buyers and sellers must have a high level of confidence in the accuracy of measurement. This assurance in custody transfer measurement is gained by adherence...
متن کاملUltrasonic Sensing for Water Flow Meters and Heat Meters
Ultrasonic flow meters are gaining wide usage in commercial, industrial and medical applications. Major benefits of utilizing this type of flowmeter are higher accuracy, low maintenance (no moving parts), noninvasive flow measurement, and the ability to regularly diagnose health of the meter. This application note is intended as an introduction to ultrasonic time-of-flight (TOF) flow sensing us...
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ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 1951
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed028p402.3