Flow measurement instruments are used to determine flow rate by monitoring the amount of media passing during a specific time. Devices within this category can monitor liquids, gases or solids, and measure in units of mass, velocity or volume.

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Air velocity flow sensors measure air velocity or volume flow using insertion probes or capture hoods.
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Electromagnetic flow meters operate on Faraday's law of electromagnetic induction, which states that a voltage is induced when a conductor moves through a magnetic field.
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Flow computers, totalizers, and rate indicators integrate the functions of flow and temperature measurement, computation, data acquisition, input / output (I/O) standardization, and closed loop control. They require external sensor inputs and may be used as local rate indicators.
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Flow Controllers (459 suppliers)

Flow controllers monitor and maintain flow-rate variables, typically in process applications.
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Flow Meters (1,653 suppliers)

Flow meters (flowmeters) and flow sensors are devices used for measuring the flow rate or quantity of a moving fluid or gas.
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Flow Switches (366 suppliers)

Flow switches are devices that monitor flow and send a trip signal to other devices, like a pump, for protection. These switches can be used for the measurement of gases, liquids, and steam.
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Flow Transmitters (243 suppliers)

Flow transmitters provide electrical outputs that are proportional to flow inputs. They use flow meters to measure the flow of liquids and gases.
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Gas Flow Meters (422 suppliers)

Gas flow meters are used for measuring the flow or quantity of a moving gas in an enclosed pipe or passage.
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Infrared Windows (34 suppliers)

Infrared windows are IR transmissive viewing-port inspection devices designed for enclosure integration. They are used for real-time visual monitoring of infrared (IR) light produced by a variety of heat-generating sources.
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Liquid Flow Meters (593 suppliers)

Liquid flow meters are used to measure the volumetric flow rate or amount of a moving liquid.
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Liquid Leak Detectors (245 suppliers)

Liquid leak detectors sense when a liquid is leaking from a pipe, tank, or other receptacle.
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Mass flow meters and controllers measure flow rate in units of mass or volume per units of time (e.g., pounds per minute). They are designed for use with gases, liquids, steams, or slurries. 
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Mass Flow Switches (40 suppliers)

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.
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Open channel flow meters measure fluid flow through open channels.
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Paddlewheel flow meters have a paddle wheel that is perpendicular to the flow path. The rotor axis is positioned to limit contact between the paddles and the flowing media.
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Positive displacement flow meters measure the volume or flow rate of a moving fluid or gas by dividing the media into fixed, metered volumes. These devices consist of a chamber that obstructs the media flow and a rotating or reciprocating mechanism that allows the passage of fixed-volume amounts.
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Rotameters (106 suppliers)

Rotameters are typically tapered glass tubes positioned vertically in the fluid flow. A float within the tube rides upward in relation to the amount of flow.
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Sight Flow Indicators (185 suppliers)

Sight flow indicators provide a quick, reliable and economical way to verify the flow of fluids through industrial process lines.
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Sight Windows (194 suppliers)

Sight windows are an effective and economical way of viewing tank, pressure vessel and piping systems interiors. They are also referred to as sight glasses.
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Solids Flow Meters (33 suppliers)

Solids flow meters measure the flow rate of bulk solids, powders, grain, etc.
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Turbine Flow Meters (271 suppliers)

Turbine flow meters measure the rate of flow in a pipe or process line via a rotor that spins as the media passes through its blades.
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Ultrasonic Flow Meters (224 suppliers)

Ultrasonic flow meters use sound waves to determine flow rates. They can be either Doppler Effect meters or Time-of-Flight meters.
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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.
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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.
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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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Vortex Flow Meters (120 suppliers)

Vortex flow meters are flow sensors that detect the frequency of vortices shed by a bluff body placed in a flow stream. The frequency of the vortices is proportional to the flow velocity.
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