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Flow Meters

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About Flow Meters

Flow meters (flowmeters) are devices for measuring the flow rate or quantity of a moving liquid or gas. There are four basic categories of devices: differential pressure (DP), positive displacement (PD), velocity, and true mass.  Differential pressure flow meters obtain the flow rate by measuring the pressure differential and extracting the square root. Choices for DP meters include cone-type devices, elbow tap meters, flow nozzles, laminar flow elements, orifice plates, Pitot tubes, rotameters, target meters, variable area flow meters, and Venturi tubes. Positive displacement flow meters divide the media into specific increments which can be counted by mechanical or electronic techniques. Examples of PD meters include nutating disc devices, oval gear meters, and piston-based designs. Velocity flow meters operate linearly with respect to the flow rate. Because there is no square-root relationship, their range is greater than DP devices. Choices for velocity meters include electromagnetic meters, paddlewheels, sonar-based devices, turbine meters, ultrasonic meters and vortex or shedding meters. True mass flow meters are used to directly measure the mass rate of flow. These flow meters include both thermal meters and Coriolis meters.  


Products & Services Related to Flow Meters

Gas Flow Meters
Gas flow meters are used for measuring the flow or quantity of a moving gas in an enclosed pipe or passage.
Liquid Flow Meters
Liquid flow meters are used for measuring the flow or quantity of a moving fluid.
Mass Flow Meters and Controllers
A mass flow meter is a device that consist of a mass flow sensor or transducer and signal processing electronics.  Fluid (liquid or gas) flow is measured in mass rate units (lbs/min).
Mass Flow Switches
Mass liquid flow switches and mass gas flow switches are devices used for measuring the flow or quantity of a moving liquid or gas in terms of a unit of mass per unit time, such as pounds per minute. These devices may be sensors with electrical output or may be stand-alone instruments with local displays and controls.
Ultrasonic Flow Meters
Ultrasonic flow meters use sound waves to determine flow rates. They can be either Doppler Effect meters or Time-of-Flight meters.
Velocity Flow Switches
Gas flow switches and liquid flow switches, velocity, are used to measure the flow or quantity of a moving fluid in terms of velocity, such as feet per minute.
Volumetric Gas Flow Switches
Volumetric gas flow switches are devices with a switch output used for measuring the flow or quantity of a moving gas in terms of a unit of volume per unit time, such as cubic feet per minute.

Engineering Web: Flow Meters - Machine Design

Pages: 1 - 3 of 129

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