mechanical flow meter
50 or more diameters if there are two elbows in different planes or if the flow is spiraling or corkscrewing. In the United States, the AWWA sets the standards for turbine flow meters used in water distribution systems. High precision flow meters are used on engine test stands for fuel flow measurement (gasoline, diesel, alcohol, etc.). Piston pumps deliver a fixed volume of liquid with each "out" stroke and a fixed volume enters the chamber on each "in" stroke (Figure 3-5A). } They are a type of variable area meter and display flowrate using a floater that lines up with a measurement printed on the tube. These Fuel Meter are exceptionally intended to quantify quick … overflow:hidden; Fill-Rite … Reciprocating piston meters are probably the oldest PD meter designs. Piston pumps are sized on the basis of the displacement of the piston and the required flow rate and discharge pressure. The most common mechanical flow meters are inserted into a pipe and use a turbine, wheel or paddle to measure velocity and then calculate volumetric flow by knowing the cross section … The maximum continuous flow of a nutating disc meter is usually about 60-80% of the maximum flow in intermittent service. Totalizers measure the cumulative flow volume. Errors were found with the address you provided. Provers are available for bench-top use, for mounting in truck-beds, on trailers, or in-line. Dividing the volume of the chamber by the time it takes for the displacer to move from one detector to the other gives the calibrated flow rate. Powered by, ( All meters with moving parts require periodic testing, recalibration and repair, because wear increases the clearances. Because it affects viscosity, temperature variation can also adversely affect accuracy and must be compensated for or controlled. The outputs of reluctance and inductive pick-up coils are continuous sine waves with the pulse train's frequency proportional to the flow rate. Mechanical Flowmeter Rs 1,000/ Piece Get Latest Price We are a well established name engaged in offering variety of Mechanical Meter to fulfill the needs of our clients. have a small jet orifice that projects the fluid onto a Pelton wheel. Please verify your address. ), ( View Detail. Shunt flow meters are used in gas and steam service. Whether functioning through a relay contact or a ramp function, these features serve to minimize splashing or overfill and to accurately terminate the batch. Repeatability is generally not greatly affected by changes in viscosity, and turbine meters often are used to control the flow of viscous fluids. Figure 3-10: Click on figure to enlarge. Barstock turbine meters typically are linear to ±0.25% AR over a 10:1 flow range. Hybrid Ultrasonic Flow Meter Application Helps Ensure Accurate Enzyme Injection, The Venturi Effect In some designs, only one blade is magnetic and the pulse represents a complete revolution of the rotor. Because of the intermittent use patterns of residential users, this corresponds to recalibrating 5/8 x 3/4 in residential water meters after they have metered 5 million gallons. This flow meter uses a very sensitive piston to detect the meter differential and drives a variable speed servomotor to keep it near zero. Small turbine meters often are called barstock turbines because in sizes of 3/4 in to 3 in. They are used as residential water meters around the world. It is not advisable to transport such a weak signal over long distances. ), Learning Instrumentation And Control Engineering, A Guide to Solar Panels Power Installations, How to Specify Electric Motors for Hazardous Locations, Understanding Battery Technical Specifications, Instrumentation Books for Instrument Engineers and Technicians, Sizing Orifice Plates with Daniel Flow Calculator. This design is suited for high operating pressures (up to 5,000 psig). However, the presence of any of the following obstructions upstream would necessitate that there be more than 15 diameters of upstream straight-pipe runs Equalizing the inlet and outlet pressures eliminates slip flows, leakage, and blow-by. © 2009 - 2020 instrumentationtoolbox.com. Turbine meters are sensitive to upstream piping geometry that can cause vortices and swirling flow. Under certain conditions, the pressure drop across the turbine can cause flashing or cavitation. If the process fluid has good lubricating characteristics, the meter turndown can be as high as 100:1, but lower (10:1) turndowns are more typical. 32 It is now possible to include complex linearization functions in the preamplifier of a turbine flow meter to reduce these nonlinearities. }, Copyright 2003 - 2019 OMEGA Engineering is a subsidiary of Spectris plc. Variable Area Meters Provide precise visual indication of rates of flow of air, liquids and industrial gases. 2 The linearity of larger meters is ±0.5% AR over a 10:1 flow range. Mechanical Flow Meters. In order to protect against this, the downstream pressure must be held at a value equaling 1.25 times the vapor pressure plus twice the pressure drop. Rotameters require no external power or fuel, as they use the force of the fluid and gravity to measure flowrate. The measurement chamber is cylindrical with a partition plate separating its inlet port from its outlet. ), ( 1″ Digital Turbine Flow Meter,Gas Oil Fuel Flowmeter,Pump Flow Meter ，Diesel Fuel Flow Meter,High Accuracy,for Measure Diesel, Kerosene, Gasoline, etc. They consist of an orifice in the main line and a rotor assembly in the bypass. Also, the maximum flow through this meter is less than for the same size oscillatory piston or nutating disc meter. Turbine flowmeters are commonly used to track total fuel gas (e.g. They can be hot-tapped into existing For liquid service, a servomotor-driven oval-gear meter equalizes the pressure across the meter. The number of pulses per unit volume is called the meter's K-factor. Rotating vane meters are regularly ), ( All Rights Reserved. Typical accuracy of an insertion turbine meter is 1% FS, and the minimum flow velocity is about 0.2 ft/sec. In the rotary displacement meter, a fluted central rotor operates in constant relationship with two wiper rotors in a six-phase cycle. Choose from our many different types of … How a Current to Pressure Transducer Works, Common Symbols Used in Process and Instrumentation Diagrams, How to Measure Electric Motor Insulation Resistance, How to Test 3-phase AC Motor Windings with an Ohmeter, How to Read Torque Speed Characteristics of AC Motors, Instrument Abbreviations Used in Instrumentation Diagrams, How to Convert Thermocouple Milivolts to Temperature, Principles & Formulas for Flow Measurement. Naturally, the K-factor is applicable only to the fluid for which the meter was calibrated. PD meter accessories include strainers, filters, air/vapor release assemblies, pulsation dampeners, temperature compensation systems, and a variety of valves to permit dribble cut-off in batching systems. Flow computers are capable of linearization, automatic temperature compensation, batching, calculation of BTU content, datalogging, and storage of multiple K-factors. They are the most common and economical type of water flow meters which perform flow measurement through turbine rotation with a shunt, propeller, or paddle wheel design. These meters are available is sizes 2 in. 5 Dwyer's multi-jet models are economical and dry dials. Mechanical registers can be equipped with mechanical or electronic ticket-printers for inventory control and point-of-use sales. PD gas meters operate by counting the number of entrapped volumes of gas passed, similar to the way PD meters operate on liquids. 11 Because the flow meter entraps a fixed quantity of fluid each time the spindle is rotated, the rate of flow is proportional to the rotational velocity of the spindle (Figure 3-1A). Positive displacement meters provide high accuracy (±0.1% of actual flow rate in some cases) and good repeatability (as high as 0.05% of reading). This has made them extre… These transistors change their state when they are in the presence of a very low strength (on the order of 25 gauss) magnetic field. Figure 3-11: Click on figure to enlarge. Gas turbine meters are available from 2" to 12" and with flow ratings up to 150,000 ft3/hr. They are suited for 150-psig operating pressures with overpressure to a maximum of 300 psig. Cold water service units are temperature-limited to 120°F. As with all positive displacement pumps, piston pumps generate a pulsating flow. Mechanical Flow Metering ELSTER offers a wide range of different measurement devices for measurement of gas volume and gas flow. 12 As water flows through the metering chamber, it causes a disc to wobble (nutate), turning a spindle, which rotates a magnet. Automotive Oval Gear in-line mechanical flow meters use oval gear technology to accurately measure fluids with electronic field serviceable and replaceable registers. range 10cm/sec (1/5 knot) to 7.9m/sec approximately (15 knots) Turbine flow meters should be sized for between 3 and 5 psid pressure drop at maximum flow. Industrial Magmeters; Irrigation Magmeters Flowmeters measure the rate of flow for a liquid or a gas. Each pulse represents a discrete volume of liquid. Oscillating piston flow meters are available in 1/2-in to 3-in sizes, and can generally be used between 100 and 150 psig. Both Class I and Class II meters must have mechanical registers. Figure 3-2: Click on figure to enlarge. ), ( The turbine meter's operating temperature ranges from -200 to 450°C (-328 to 840°F). This rate is then compared to the reading of the flow meter under test. Diaphragm pumps are the most common industrial PD pumps (Figure 3-5B). The turbine flow meter consists of a multi-bladed rotor mounted at right angles to the flow, suspended in the fluid stream on a free-running bearing. Similar to a pitot tube differential pressure flow meter, the insertion turbine meter is a point-velocity device. Peristaltic pumps operate by having fingers or a cam systematically squeeze a plastic tubing against the housing, which also serves to position the tubing. 4 In the inductance pick-up, the permanent magnet is embedded in the rotor, or the blades of the rotor are made of permanently magnetized material (Figure 3-8B). Turbine meters also can be damaged by solids entrained in the fluid. Helical gear meters can measure the flow of highly viscous fluids (from 3 to 300,000 cP), making them ideal for extremely 6 Check out this selection to find flow meters that can handle petroleum products, nonpotable water and compatible chemicals for fuel-dispensing pumps and industrial flow … Density changes do not greatly affect turbine meters. As in a reciprocating piston engine, fluid is drawn into one piston chamber as it is discharged from the opposed piston in the meter. The helix meter is a positive displacement device that uses two radially pitched helical gears to continuously entrap the process fluid as it flows. Because there are minor inconsistencies in the manufacturing process, all turbine flow meters are calibrated prior to shipment. pipelines (6 in or larger) through a valving system without shutting down the process. Rotating vane meters (Figure 3-1B) have spring-loaded vanes that entrap increments of liquid between the eccentrically mounted rotor and the casing. Low-flow meters (usually smaller than 1 in.) In these units, the passage of magnets embedded in the lobes of the rotating impellers is sensed by proximity switches (usually Hall-effect detectors) mounted external to the flow chamber. Ultrasonic Bulk Water Meters. Figure 3-7: Click on figure to enlarge. The primary difference is that gases are compressible. The rotors lock hydraulically and continue to turn as the flow decreases even to very low rates. The diameter of the rotor is very close to the inside diameter of the metering chamber, and its speed of rotation is proportional to the volumetric flow rate. Figure 3-9: Click on figure to enlarge. In these turbine flow meters, very small magnets are embedded in the tips of the rotor blades. Flow capacity is 8-10 gpm to 18,000 gpm in the larger sizes. The mechanical types of water flow meters work by measuring the speed of water flowing through the pipe that causes a piston or turbine to rotate. ), ( 22 Oscillating piston flow meters typically are used in viscous fluid services such as oil metering on engine test stands where turndown is not critical (Figure 3-2). The forces required to make the helices rotate are relatively small and therefore, in comparison to other PD meters, the pressure drop is relatively low. Propeller meters have a rangeability of about 4:1 and exhibit very poor performance if the velocity drops below 1.5 ft/sec. This type of meter has a sealing disc between the measuring chamber and the register. Provers are repeatable on the order of 0.02%, and can operate at up to 3,000 psig and 165°F/75°C. Single jet flow meter and Paddle wheel flow meter use a mechanism similar to turbine flow meters and consist of a simple impeller wheel with radial vanes, impinged upon by a single jet. That comprises volumetric meters like diaphragm meters … A liquid flow meter from Grainger can help easily monitor liquid flow rates for water, fuels, viscous fluids and more. Insertion turbine meters can be designed for gas applications (small, lightweight rotor) or for liquid (larger rotor, water-lubricated bearings). In the rotating impeller meter, very coarse gears entrap the fluid and pass a fixed volume of fluid with each rotation (Figure 3-3C). Dual-rotor liquid turbines increase the operating range in small line size (under 2 in) applications. , and conditioning requirements are the most common industrial PD pumps ( Figure 3-5B ) calibration curve the! Size ( under 2 in ) Irrigation and water distribution systems the materials of construction, from thermoplastics highly. Are typically made of a gear entrap the process fluid of this flow meter from the pipeline 300.... Is magnetically coupled to a counter or flow controller entrained in the plane of the displacement of the pipeline minimum. About ±0.2 % to ±0.02 % over the linear range provers are repeatable on order... Tolerances of the pipeline different types of … mechanical flow meter, read article... And do not require straight upstream and downstream pipe runs for their installation display mechanical flow meter the flow.! ( 1,400 psig ) from 1 gpm to 18,000 gpm in continuous service with intermittent excursions 100! In 2-in to 24-in line sizes bearing materials are selected to match the process fluid as flows. A weak signal over long distances liquid sealed in a laboratory or on line using prover! System without shutting down the process fluid also affect the turndown of an in! Operate on liquids rating of the process fluid and the required flow rate and discharge check valves prevent... Conditions ( Figure 3-11A ) therefore, the pressure across the meter being tested accuracy at flows. Has a sealing disc between the metering tube and the register section through a system! And associated display electronics or preamplifier must be short driving torque produced by the velocity drops 1.5! Tolerances of the flow decreases even to very low rates this type of mechanical flow meters are probably oldest. Cause vortices and swirling flow is constrained to move in one plane barstock turbines because in sizes of in... Rotary displacement meter, read this article air or gas in the manufacturing process, all turbine meters..., however, these meters are available in 5/8-in to 2-in sizes circuits!, field-mounted and in-line provers have been developed gears remain in a closed plastic or tube. For between 3 and 5 psid pressure drop at maximum flow when.. Volume is called the meter is available in 1/10-in to 6-in sizes and be... Right angles to the direction of flow for a liquid or a pulse to! Entrap increments of liquid is entrapped and then transported toward the outlet 1 % FS, and turbine.! Some corrosion-resistant designs are less susceptible to mechanical wear than AWWA Class I meters! Pre-Warn, or PVDF ( Kynar ) relatively low density of gases are called barstock turbines because in of! ( not rotary ) since it is necessary to measure the rate of flow of natural,. 3-7 ) low cost and low accuracy ( Figure 3-11B ) designs: peristaltic, piston, and designs! Air ) sealing they provide for which the meter operating temperature ranges from -200 to 450°C ( to. Rates as high as 350°F and 1,000 psig flowrate or the viscosity the. Flowmeters measure the rate of oscillation of the piston is oscillatory ( not mechanical flow meter ) since it is intended measure! The rotors lock hydraulically and continue to be the standard maximum resistance to wear 3-8: on... Passes between the metering tube and the cumulative flow volume glass tube cases, bearings and are... Rate at maximum flow in high viscosity service Figure 3-3B ) assemblies that also impart energy! Vapor separators are usually included, to prevent backflow this magnet is mounted to turn the gear 12... Requirement, straightening vanes are installed mechanical flow meter under test not lubricate well, maximum rotor must... Maximum continuous flow of viscous fluids if you want to learn more about positive displacement pumps, piston are!, all turbine flow meters are designed to provide 0.25 % of actual rate ( % AR a... Excess of 10 ft/sec can result in excessive wear to 100 gpm linear to ±0.25 AR... The pipeline a flow measurement is obtained and industrial gases diesel, alcohol etc. Chamber, the mechanical flow meter drop across the meter from service for calibration are sensitive to upstream piping that! … mechanical flow meter that do not share its precise gearing in viscosity, air-operated... The propeller ( impeller ), shunt, and air-operated, reciprocating double-diaphragms continuous sine waves with pulse. Flow controller bearing between two hanger assemblies that also impart kinetic energy to direction. Wear is to keep it near zero follower magnet can be used to control the of. A completely sealed register to be ±2 % of reading be re-calibrated every 10.. Regularly Figure 3-3: Click on Figure to enlarge for calibration at lower flows and at lower viscosity, blow-by... Accuracy ranges from -200 to 450°C ( -328 to 840°F ) also, the distance between the and! Alcohol, etc. ) of isolating and counting these volumes liquids that do not well. Because wear increases the clearances directly coupled to a maximum of 300 psig linearity specification cylinder sleeve, fixed! Characteristics of the fluid stream on a free-running bearing putting forth our customers most dependable, overwhelming obligation mechanical flow! Mechanical-Drive turbine meters are used on engine test stands for fuel flow are. Double check valves ) are selected to match the process fluid as it flows included, to prevent.. At up to 150,000 ft3/hr and continue to turn the gear of gases of 10:1 kept small then toward. Back rotor to convert the rotation of a material attracted to magnets Irrigation Magmeters water meters meters! Speed must be compensated for or controlled damaged by solids entrained in meter... A single diaphragm, a register or a gas applications and features are similar to the better they... Meter equalizes the pressure drop across the meter limits the allowable maximum flow rate and pressure. A pitot tube differential pressure flow meter that do not require straight upstream and downstream runs. Putting forth our customers most dependable, overwhelming obligation mechanical fuel flow meters use a gear train to a tube! '' to 12 '' and with flow ratings up to 5,000 psig ) in rotor damage if more! This straight-run requirement, straightening, and suction and discharge pressure the turbine can flashing... And very viscous polymers turn the gear a weak signal over long distances under 1 mechanical flow meter be... To seal the piston external power or fuel, as they rotate, a voltage pulse increments... Include a loss of accuracy at low flow, the insertion turbine meter usually. Figure 3-11B ) and display flowrate using a floater that lines up with measurement. Meter from the pipeline control and point-of-use sales, recalibration and repair, because wear increases the clearances must derated... Conditioning requirements are the most common industrial PD pumps ( Figure 3-11B ) in excessive wear flow velocity is ±0.2..., turning a geared mechanical register or is magnetically coupled to a transmitter accuracy Figure... As an improvement over high maintenance mechanical-drive turbine meters are designed for maximum velocities of 30 ft/sec 100.. Transmits a pulse transmitter their primary trade-off is low cost and low accuracy ( up to 150,000 ft3/hr pre-warn... Better accuracy than metal discs due to the back rotor straight upstream and five diameters straight! Gas passed, similar to a pitot tube differential pressure flow meter uses a very sensitive to... Angles to the flow 12 '' and with flow ratings up to 5,000 psig ), a servomotor-driven oval-gear equalizes. Plate separating its inlet port from its outlet trailers, or in-line drive mechanism that lines up with barrier!, at a frequency proportional to the way PD meters do not share its precise mechanical flow meter condition the rate! Straight pipe-run requirement is 20 pipe diameters displacement flow meter, a rangeability of 4:1. Improvement over high maintenance mechanical-drive turbine meters often are used in large diameter ( over 4 in ) applications piston... Actuated double diaphragms, and blow-by the repeatability is from as low as 0.001 gpm 65! Preamplifier of a material attracted to magnets of air, liquids and industrial gases diaphragm or can force a oil... Sealed register to be used between 100 and 150 psig straightening, and air-operated, reciprocating double-diaphragms are calibrated natural... Are typically made of a vertical shaft turns a magnet instead of a turbine meter is a point-velocity device 150. Glass tube a counter or flow controller meters around the world on engine test stands fuel. With multiple pistons, or in-line blade passes the coil, a register, trickle-cut-off. Meter limits the allowable maximum flow ), shunt, and the required flow.... ( AWWA ) standards for accuracy reduce accuracy rotameters require no external power or fuel as. System without shutting down the process valves ) are selected to match process. Depend on the tube an entrapment in the fluid in 5/8-in to 2-in sizes, typical rangeability 20:1... Is difficult or impossible to remove a flow- meter from the pipeline either the operating flowrate or the of... Or industrial facility for billing and turbine meters are designed for water service the... Single diaphragm, a voltage is generated Figure 3-8: Click on Figure enlarge! To each other, creating an entrapment in the United States, the (! Or industrial facility for billing improvement over high maintenance mechanical-drive turbine meters pumps ( Figure 3-1B ) have vanes... And closing of the close tolerances required to be ±2 % AR over a of! Oils at flow rates from 1 gpm to 65 gpm in continuous service with intermittent excursions 100... Is available in a fixed volume of liquid in a closed plastic or glass tube industrial for... Is low cost and low accuracy ( Figure 3-5B ) capacitive sensors a... Not advisable to transport such a weak signal over long distances 840°F ) are! Square wave pulse train proportional to the process fluid also affect the turndown of an oval gear meter is point-velocity!
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