Positive displacement flow meters measure the volumetric flow rate of a moving fluid or gas by way of precisionfitted gears or rotors containing cavities through which precisely known volumes of fluid pass. Oval mini meter positive displacement flow meter aug 10, 2016 2328 the mini meter is a positive displacement flow meter best suited for measuring lubrication oils for various kinds of machines and. The force of the liquid moving through the flowmeter drives the measuring gears. In problems involving liquids with a free surface, a negative pressure shows. Jul 03, 20 a 15 second video demonstrating positive displacement flow meter calibration for a low flow oil application. Each company has detailed profile information, locations, phone number, website links, product videos and product information defined. Positive displacement flow meters, master pd flowmeter. They are named after the mechanical device inside the chamber.
Positive displacement flow measurement technology accurately measures the volume of liquid or gas passing through the flow meter. Top 6 positive displacement flow meter manufacturers 2017. The honeywell versaflow vortex flowmeter has integrated pressure and temperature compensation in 2wire technology, providing maximum performance at the lowest installed cost. Siemens sitrans flow meter positive displacement pd. Siemens sitrans flow meter positive displacement pd rotary piston. Improvements to the meter have been through the use of new materials. Pdf in the modern age of industrialization measuring the flow of fluid. The volume flow rate can be calculated from the revolution rate of the mechanical device. Positive displacement flowmeters petrol instruments. The dom series positive displacement flowmeter is the preferred choice for measuring viscous liquids such as lubricatinghydraulic oils, diesel fuels, chemicals, solvents, resins, and pastes. The measurement, instrumentation and sensors handbook kelm. The honeywell versaflow vortex flowmeter has integrated pressure and temperature compensation in 2wire technology. On the negative side performance is correspondingly lower with the linearity typically 2%. Positive displacement flow meter for fuels and oils positive displacement flowmeter for industrial processes the level of recommended maintenance is heavily influenced by the application.
Applications include lubricants, fuels, chemicals and solvents, oils and greases. The flow through the meter measurement chamber follows the path of least resistance. Principle of operation flow meters and flow computers. The oval gear meters are positive displacement flowmeters where the passage of liquid causes two oval gears to rotate within a precision measuring chamber and with each rotation a fixed. As the name implies a flow meter is an instrument for monitoring, measuring, or recording the rate of flow, pressure, or discharge of liquids or gasses. Therefore, flow technology has removed all but the most. The liquid stream is divided into the fixed volume cavities between the gear teeth and metering body. Positive displacement gear flow meters can be installed either a horizontal or vertical flow up orientation.
Siemens offers a comprehensive range of process equipments for pressure, temperature, flow and level measurement. The liquid controls positive displacement flowmeter series directly converts volume to rotational output with minimum scope for. Positive displacement flowmeters for high viscosity fluids well suited for viscous fluids which are difficult to meter with a turbine type flowmeter. Ifc inflow offers positive displacement flow meter. Positive displacement flow meter on sales quality positive. Every cycle of the meters mechanism displaces a precisely. These positive displacement flow meter companies can design, engineer and manufacture positive displacement flow meters to your specifications and application need. At contrary, should the rotation of timing gears be not free and uniform, it is necessary to pullout the inner housing assembly from the outer.
Positive displacement flow meter calibration youtube. Thermistors type ntc negative temperature coefficient ptc positive. Positive displacement flowmeters for high viscosity fluids. Therefore, no liquid passes through the centre cavity between the measurement gears. For example if a flow meter is processing a fluid that displays lubricating properties i. Positive displacement flow meters sparlings inventory of oval positive displacement meters are designed for flow measurement of very small flow rates in applications requiring high accuracy. Positive displacement flow meter description our positive displacement flow meter is a kind of oval gear flow meter,along to positive displacement flow meter. Every cycle of the meter s mechanism displaces a precisely defined positive quantity of fluid, so that a count of the number of mechanism cycles yields a precise quantity for the total fluid volume passed through the flow meter. This technology works by directing the fluid to mechanically displace. These robust positive displacement fluid flow measuring devices are available in a wide variety of configurations and options including digital displays. Macnaught positive displacement flow meters flow rate range selection chart figure 4. Positive displacement type flow meter applications of positive displacement meters. These meters achieve this by trapping small amounts of fluid between rotating components within a high precision chamber. Principle of operation flow technologys positive displacement flowmeters use two rotating, thermoplastic impellers driven by the flowing liquid.
Ideal for many flow measurement applications, including many oil flow applications. Applications, advantages and disadvantages of positive. Generally, an ebook can be downloaded in five minutes or less. Positive displacement flow meters sparling instruments, llc. Meter requires fluid to mechanically displace components in the meter. There are many types of viscometers, which use the principle that it requires a torque to. Positive displacement flowmeters flowmeters oval product. This technology works by directing the fluid to mechanically displace components within the meter to measure its flow as discreet parcel volumes. Lc meters incorporate a unique design, presenting minimal intrusion in a flowing stream of liquid, as well as minimal. Sep 15, 2015 positive displacement flow meter the dom series positive displacement flowmeter is the preferred choice for measuring viscous liquids such as lubricatinghydraulic oils, diesel fuels, chemicals, solvents, resins, and pastes. The dom series positive displacement flowmeter is the preferred choice for measuring viscous liquids such as lubricatinghydraulic oils, diesel fuels. Positive displacement flow measurement technology accurately measures the volume of liquid passing through the flow meter. The positive displacement principle is the only accurate method of measuring fluid flow.
The meter then became known as the glover twodiaphragm. Positive displacement meter is a type of flow meter that requires fluid to mechanically displace components in the meter in order for flow measurement. Positive displacement flow meter, master pd flowmeters, preset batching flowmeter, tank truck loading flowmeter, manufacturer, supplier, pune, maharashtra, india. They wont measure very well if the two transducers arent lined up. Positive displacement flow meters accurate flow measurement. Positive displacement flow meters are precision made liquid measuring flow meters. Simplicity of design and construction ensures unmatched accuracy and troublefree operation over long periods of use. Positive displacement flow meters measure the volumetric flow rate of a moving fluid or gas by way of precisionfitted gears or rotors containing. Dec 05, 20 positive displacement flow meter positivedisplaceme ntflowmeter. Click here to download the comprehensive 290page handbook now. The oval gear meter is a also a type of positive displacement meter.
The meter is bidirectional and it has an extremely large turndown ratio, up to 400. Introduction to positive displacement flowmeters pd. Mar 23, 2018 positive displacement flow meters are the only flow measuring instrument that can directly measure the volume of liquid passing though the flow meter. Positive displacement flow meters dce series pd meter flow technology has taken its patented flowmeter design and made it simpler. A 15 second video demonstrating positive displacement flow meter calibration for a low flow oil application. Positive displacement flow meter the dom series positive displacement flowmeter is the preferred choice for measuring viscous liquids such as lubricatinghydraulic oils, diesel fuels.
Additional positive displacement flow meter manufacturers. Coriolis flowmeter is a mass flowmeter to directly and continuously measure the. It is recommended to operate the flowmeter only within the flow rate limits specified in the nameplate. Positive displacement flow meters are designed for low flow and high accuracy over a wide range of fluid viscosity generally used for thicker liquids. There are many types of internals such as two or three gear oval gear, nutating disc, rotary piston and sliding vane. With our knowledge about flow measurement and management, we can help save cost. The measurement of viscosity is a large and complicated subject. These are available in single, double and triple capsule models to suit applications covering a wide range of flow capacities. The vff positive displacement flowmeter has been developed over the years to.
Positive displacement flow meter positivedisplaceme ntflowmeter. By directing the fluid to mechanically displace components in the meter in order to measure its flow as discreet parcel volumes. Hydraulic testing, chemical injection or chemical dosing, pharmaceutical application and similar precision applications. Positive displacement flow meters tl series pd flow meters 3 to 8. Prior to meter principle qualification for this application one meter 1, 5 was tested. They are used in high viscous, dirty fluid which does not flow through the straight conduit. Many types of positive displacement flowmeters are used in the industry. To find out how to measure a given variable, do a word or phrase search, select the. Using manometers to precisely measure pressure, flow and level. Magnets embedded within the gears initiate a high resolution pulse train output. A positive displacement meter is a type of flow meter that requires fluid to mechanically displace components in the meter in order for flow measurement. Their meter had two moving diaphragms, two slide valves, and a dial index.
Understanding how a positive displacement flow meter works. These devices consist of a chamber that obstructs the media flow and a rotating or reciprocating mechanism that allows the passage of fixedvolume amounts. Lessons about positive displacement flow meters omega. The movement of gear is measured by means of a pickup sensor located in the cover. Positive displacement flow meters a positive displacement flow meter measures flow by displacing a precise and known volume for each revolution of their internal parts. Positive displacement flow meter, master pd flowmeters. The positive displacement flow meters are also used for viscous liquids. A quick and easy to use request for quote form is provided for you to contact these positive displacement flow meter manufacturers and suppliers. Positive displacement meter an overview sciencedirect. Rz sanitary positive displacement flowmeter the rz series positive displacement flowmeter is the solution to applications requiring precision flow measurement from a sanitary design. Liquid controls mseries rotary motion positive displacement pd meters offer the ultimate in measurement accuracy for custody transfer of petroleum products, aviation fuels, lpg, and a broad range of industrial liquids. Each company has detailed profile information, locations. Series pdm flowmeter principle of operation the series pdm flowmeter uses the oscillating piston principle where the passage of liquid causes a piston to oscillate smoothly in a circular motion within the measuring chamber.
Oval mini meter positive displacement flow meter aug 10, 2016 2328 the mini meter is a positive displacement flow meter best suited for measuring lubrication oils for various kinds of machines and instruments in the management of fuel oil consumption with small oil burner. Positive displacement flow meter, jsn positive displacement. In principle, positive displacement flowmeter requires no external energy such as electricity. Pdf design and fabrication of a turbine flow meter researchgate. Flow meter resources flow meter application advisor. Turbine flow meters have been used to measure fluid flow for a wide variety of. If flowmeters are installed in cold places and so coben measuring water in such cold places, it is recommended, once the measuring cycle has been completed. Magnets imbedded in the impellers activate a nonintrusive sensor which generates a pulsed output signal. The author first discusses the need to measure flow and then. Impact of viscosity and flow range on meter accuracy accuracy % for viscosities greater than cps. Many customers do not need the wide array of options that the dci series offers. Flowrate is calculated from the number of revolutions of a rotors activated by the energy of fluid. These devices consist of a chamber that obstructs the media.
Section v comprises fluid mechanical variables such as pressure, flow, and velocity. It has two sides connected to the inlet and outlet ports. Positive displacement meters separate defined volumes of the. The operating principle of the oval gear meter is based on two or more ovalshaped gears configured to rotate always at right angles to one another. A positive displacement flow meter is a cyclic mechanism built to pass a fixed volume of fluid through with every cycle. Positive displacement flow meters measure the volume or flow rate of a moving fluid or gas by dividing the media into fixed, metered volumes.
Positive displacement flow meter for fuels and oils positive displacement flow meter for industrial processes the level of recommended maintenance is heavily influenced by the application. They can be used in very viscous, dark colored fluids. The meter then became known as the glover twodiaphragm, slide valve type meter. With only 2 moving parts, the positive displacement meter offers trouble free operation and long service life. Positive displacement pd flow meters measure the volumetric flow rate of a moving fluid or gas by dividing the media into fixed, metered volumes finite increments or volumes of the fluid. Simplicity of design and construction ensures unmatched accuracy and trouble free operation over long periods of use. About positive displacement flow meters instrumart. Jul 31, 2012 the oval gear meters are positive displacement flowmeters where the passage of liquid causes two oval gears to rotate within a precision measuring chamber and with each rotation a fixed volume of liquid passes through the meter. Simplicity of design and construction ensures unmatched accuracy and trouble free. Series pdm flowmeter outputs reed switch output provides a voltage free contact closure. Positive displacement flow meter flow meter directory. No other technology can achieve such accuracy because measurement becomes inferred, which is indirect and subject to assumption.
970 967 235 1053 918 1366 1303 224 1240 667 965 1447 656 1490 1213 434 323 1322 170 1492 1003 999 929 237 371 1038 301 726 575 648 1395 930 1114 1191 215 591 1351 850 809 1050 153 1259 226 124 1046 774 375 1475 968