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Volumetric Gas Flow Switches

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About Volumetric Gas Flow Switches

Volumetric gas flow switches have a switch output and are used to measure the flow or quantity of a moving gas in terms of a unit of volume per unit time, such as cubic feet per minute. They differ in terms of switch type, normal state, poles, and throws. There are two types of volumetric gas flow switches: electromechanical and solid-state. For each type of device, the normal state can be normally open (NO) or normally closed (NC). In terms of poles, a single pole (SP) switch has a single set of contacts for switching just one electrical line. A double pole (DP) switch has two sets of contacts for switching two lines simultaneously. Volumetric gas flow switches with more than two sets of contacts are also available. Single throw (ST) volumetric gas flow switches are simple, on/off devices. With double throw switches (DT), a common contact is switched between two contacts.  

Selecting volumetric gas flow switches requires an analysis of performance specifications and media capabilities. Performance is determined by the turndown ratio, the effective dynamic or operating range of the device. For example, a 500 SCCM volumetric gas flow switch with a turndown ratio of 50:1 will operate effectively and resolve flow down to 10 SCCM. Similarly, a volumetric gas flow device with a turndown ratio of 100:1 will resolve effectively to 5 SCCM. Performance specifications for volumetric gas flow switches also include gas volumetric flow rate, operating temperature, and operating pressure. Media capabilities are determined by meter technology and may include gas, liquid, steam, and suspended solids or slurries. Media temperature range is dependent on construction and liner materials.   

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Products & Services Related to Volumetric Gas 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.
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 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.

Engineering Web: Volumetric Gas Flow Switches

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Qualiflow - http://www.qualiflow.com/ Innovative solutions for UHP gas systems: mass flow controller, high purity valve, gas systems.
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Fluid Components International (FCI) - http://www.fluidcomponents.com Specializes in gas flow measurement and thermal dispersion technology.
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ABLE flow measurement solutions.
Volumetric and Mass Flow Meters, Flow Switches and Flow Indicators
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