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Velocity Flow Switches

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About Velocity Flow Switches

Gas flow switches and liquid flow switches, velocity, are devices used for measuring the flow or quantity of a moving fluid in terms of velocity, such as feet per minute. These may be plain sensors or sensor systems with displays and computer outputs. The most important specifications for velocity style gas flow switches and liquid flow switches are the flow rate to be measured and whether liquids or gases will be the measured fluids. Also important are operating pressure of the fluid line, the fluid temperature and accuracy. The technologies for velocity gas flow switches and liquid flow switches vary widely.

The most common types are inferential flow measurement, positive displacement, velocity meters, and true mass flow meters. Inferential measurement refers to the indirect measurement of flow by directly measuring another value and inferring the flow based on well-known relationships between the directly measured value and flow. The use of differential pressure as an inferred measurement of a liquid's rate of flow is the most common type of unit in use today. Examples of differential pressure meters include orifice plates, Venturi tubes, flow nozzles, cone types, Pitot tubes, target meters, elbow tap meters and rotameters. 

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Products & Services Related to Velocity Flow Switches

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.
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.
Volumetric Liquid Flow Switches
Volumetric liquid flow switches measure the flow or quantity of a moving fluid in terms of a unit of volume per time, such as liters per minute. These flow sensing devices have a switch output.

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Engineering Web: Velocity Flow Switches

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Dwyer Instruments Home Page 2009
Flow Sensors Flow Switches Flowmeters Flow Indicators / Controllers Flow Transmitters Mass Flowmeters and Controllers Sight Flow Indicators Sight
See Dwyer Instruments Inc. Profile & Catalog
Flow Switches for Liquids and Gases - Cole-Parmer Catalog
Flow Switches Mini Low-Flow Switches show all...
Application Note 694 A DMOS 3A, 55V, H-Bridge: The LMD18200
Because the switches allow H-Bridge: with intrinsic clamp diodes, connected in an H-Bridge con- current to flow bidirectionally, the voltage across
See National Semiconductor Information
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