3/9/2024 0 Comments Water flow meterHowever, these technologies also have mechanical parts that are subject to wear-and-tear that can increase maintenance and overall cost of ownership. Some flow technologies, such as positive displacement, turbine, differential pressure, have been around for at least a hundred years and have been proven to be reliable. Old Technology Versus New Flow Technologies. Once the selection has been narrowed down based on the media phase, other application-specific factors related to the media such as chemical compatibility with the meter’s wetted parts, the media viscosity, and the media density must be taken into account. Downloadīest fit flow technology based on fluid media: liquids, gases, and steam can each be measured with several different flow technologies. The following chart provides typical pricing for various flow measurement technologies broken down by industry/application. Selecting a flowmeter for any given application is a process of balancing the application requirements and needs with the amount of money budgeted for instrumentation. Downloadįlow meters are available with a wide variety of capabilities and price points. The following chart illustrates the maximum and minimum runs of straight pipe required for each of the flow measurement technologies. In the flow meters industry, this is referred to as a straight-run requirement. Since most flow meters that sense velocity are sensitive to turbulence, they must be installed at a specific point within the process pipeline that contains a length of straight, rigid pipe that is long enough to ensure laminar flow so that the meter is able to provide stable, accurate readings. A higher turndown ratio generally corresponds to a higher quality, more accurate instrument. A flow meter that is capable of measuring flow rates ranging from 10 to 100 GPM would have a turndown ratio of 10, or 10:1. Iv) What is the rangeability or turndown? The turndown ratio is a measure of the instrument’s rangeability and is defined as the full-scale calibrated flow rate divided by the lowest flow rate that the instrument is capable of measuring. Iii) Economical accuracy: >1% for liquid, >2% for gas/steam Ii) Standard accuracy: 0.5% for liquid, 1.5% for gas/steam I) High accuracy: 0.1% for liquid, 0.5% for gas/steam Is the meter accuracy stated in percent of full-scale or percentage of reading? suitable for a particular flow technology? Please see technologies and process limits downloads – in metric or U.S. Matching your Application Parameters with a Flow TechnologyĪre the meter’s application parameters such as pipe size, flow rates, pressure, temperature, etc. This website provides a resource to explain the theory of operation for each and the tools to help identify the ideal meter for your situation.Įvaluation of any flow meter for a given application must consider the following:Ī) Does the sensing element contain moving parts that require periodic maintenance?ī) Does the meter contain analog transducers that may drift over time?Ģ. Smartmeasurement TM offers a comprehensive portfolio of all flow technologies to address whatever operating conditions your specific application entails. Other new technologies such as Coriolis or thermal dispersion are capable of measuring mass flow directly which means that they are unaffected by changes in pressure, temperature and viscosity and do not require the real-time compensation. Many newer technology flow meters feature integrated flow computers to compensate for variances in actual process conditions such as pressure drop, temperature, viscosity and density in real time. Finally, there are inferential flow meters that do not measure volume, flow velocity or mass, but rather measure flow by inferring its value from other measured parameters such as differential pressure across a known obstruction, force measured against a target placed in the flow profile, or variable area flowmeters which relate linear displacement of a float with known mass and geometry to the measured flow rate. Other meters, such as Coriolis and thermal flow meters measure mass flow directly, while only positive displacement flow meters directly measure volumetric flow.
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