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Types of Flowmeters | |
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Rotameters or Variable Area Flowmeters for Gases and Liquids The rotameter is a tapered tube and a float. It is the most widely used variable-area flow meter because of its low cost, simplicity, low pressure drop, relatively wide rangeability, and linear output. For a complete listing of Rotameters click on the image to the left. |
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More Variable Flow Meters: Spring and Piston FlowMeters for Gases and Liquids Piston-type flowmeters use an annular orifice formed by a piston and a tapered cone. The piston is held in place at the base of the cone (in the "no flow position") by a calibrated spring. Scales are based on specific gravities of 0.84 for oil meters, and 1.0 for water meters. Their simplicity of design and the ease with which they can be equipped to transmit electrical signals has made them an economical alternative to rotameters for flowrate indication and control.For a complete listing of Spring and Piston flow meters, click on the image to the left. |
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Mass Gas Flow Meters Thermal-type mass flow meters operate with minor dependence on density, pressure, and fluid viscosity. This style of flowmeter utilizes either a differential pressure transducer and temperature sensor or a heated sensing element and thermodynamic heat conduction principles to determine the true mass flow rate. Many of these mass flowmeters have integral displays and analog outputs for data logging. Popular applications include leak testing and low flow measurements in the milliliters per minute. For a complete listing of Mass Flowmeters click on the image at left. |
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Ultrasonic Flow Meters (Non-Intrusive or Doppler) for Liquids The ultrasonic doppler flow meters are commonly used in dirty applications such as wastewater and other dirty fluids and slurries which ordinarily cause damage to conventional sensors. The basic principle of operation employs the frequency shift (Doppler Effect) of an ultrasonic signal when it is reflected by suspended particles or gas bubbles (discontinuities) in motion. For a complete listing of Ultrasonic Flowmeters click on the image at left. |
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Turbine Flow meters The turbine meter can have an accuracy of 0.5% of the reading. It is a very accurate meter and can be used for clean liquids and viscous liquids up to 100 centistokes. A minimum of 10 pipe diameters of straight pipe on the inlet is required. The most common outputs are a sine wave or squarewave frequency but signal conditioners can be mounted on top for analog outputs and explosion proof classifications. The meters consists of a multi-bladed rotor mounted at right angles to the flow and suspended in the fluid stream on a free-running bearing. For a complete listing of Turbine Flowmeters click on the image at left. |
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Paddlewheel Sensors One of the most popular cost effective flowmeters for water or water like fluids. Many are offered with flow flittings or insertions styles. These meters like the turbine meter require a minimum of 10 pipe diameters of straight pipe on the inlet and 5 on the outlet. Chemical compatibility should be verified when not using water. sine wave and Squarewave pulse outputs are typical but transmitters are available for integral or panel mounting. The rotor of the paddle wheel sensor is perpendicular to the flow and contact only a limited cross section of the flow. For a complete listing of Paddlewheel Flowmeters click on the image at left. |
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Positive Displacement Flowmeters These meters are used for water applications when no straight pipe is available and turbine meters and paddlewheel sensor would see too much turbulence. The positive displacement are also used for viscous liquids. For a complete listing of Positive Displacement Flowmeters click on the image at left. |
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Vortex Meters The main advantages of vortex meters are their low sensitivity to variations in process conditions and low wear relative to orifices or turbine meters. Also, initial and maintenance costs are low. For these reasons, they have been gaining wider acceptance among users. Vortex meters do require sizing, contact our flow engineering. For a complete listing of Vortex Flow Meters click on the image at left. |
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Pitot Tubes or Differential Pressure Sensor for Liquids and Gases The pitot tubes offer the following advantages easy, low-cost installation, much lower permanent pressure loss, low maintenance and good resistance to wear. The pitot tubes do require sizing, contact our flow engineering. For a complete listing of Pitot Tube Flowmeters click on the image at left. |
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MAGnetic Flow meters for Conductive Liquids Available in in-line or insertion style. The magnetic flowmeters do not have any moving parts and are ideal for wastewater application or any dirty liquid which is conductive. Displays are integral or an analog output can be used for remote monitoring or data logging. For a complete listing of Magnetic Flowmeters click on the image at left. |
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Anemometers for Air Flow Measurement Hot wire anemometers are probes with no moving parts. Airflow can be measured in pipes and ducts with a hand held or permanent mount style. Vane anemometers are also available. Vane anemometers are usually larger than a hot wire but are more rugged and economical. Models are available with temperature and humidity measurement. For a complete listing of Air Flowmeters or Anemometers click on the image at left. |
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