Several manufacturers, however, use crooked rotors that only rotate in the forward direction. They are used as residential water meters around the world. The rotation of the vanes moves the flow increment from inlet to outlet and discharge. Low-flow meters (usually smaller than 1 in.) Diaphragm gas meters most often are used to measure the flow of natural gas, especially in metering consumption by households. Privacy Policy The first causes the meter to read high, the second results in rotor damage. Meters with rubber discs give better accuracy than metal discs due to the better sealing they provide. Class II turbine meters must register between 98.5-101.5% of actual rate. B2-20120091-4. Therefore, field-mounted and in-line provers have been developed. Whenever we make news, we put a link to it here.W, Quick Deliveries of High Quality Valves and Flow Meters, 2-way Full Port Lead Free Brass Ball Valves, Ball & Butterfly Valves with Limit Switches, Low Emission Triple Offset Butterfly Valves, Stainless Steel; NPT, Tri-Clamp w/ Cavity Fillers, Carbon Steel, Stainless Steel; ANSI Flanged, CS or SS; NPT, Socket Weld, T-Clamp, Flanged, Triple Offset Low Emission Butterfly Valves, Emergency Shut-off Valves Swing Check Valves, Pneumatic & Electro-Pneumatic Valve Positioners, Emission Containment Packs for Ball Valves, Explosion Proof Heavy Duty Electric Actuators, Compare all Meters that Display Flow Rate, Lead Free Positive Displacement Water Meter/Submeter, Fire-Safe Shutoff Valves with Fusible Link, Fire-Safe Ball Valves with Thermal Shutoff. Rotating lobe and impeller type PD meters are variations of the oval gear flow meter that do not share its precise gearing. When operating at elevated gas pressures (1,400 psig), a rangeability of 100:1 can be obtained in larger size meters. The piston is guided by a control roller within the measuring chamber, and the motion of the piston is transferred to a follower magnet which is external to the flowstream. Doppler Vs Transit Time Ultrasonic Meters. Rotors are often made from stainless steel, and bearings of graphite, tungsten carbide, ceramics, or in special cases of synthetic ruby or sapphire combined with tungsten carbide. Because at maximum flow the pressure drop through the meter should not exceed 30 psid, the maximum rated flow through the meter is reduced as the fluid viscosity increases. Characteristics such as horizontal and vertical positioning streamline installations in-line, and designs such as ultrasonic flowmeters, featuring non-invasive installation and readable monitors, are designed to make surveillance a simple task. Flow meters are also commonly referred to as flow gauge, flow indicator, and liquid meter. Nutating disc meters are the most common PD meters. 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. Figure 3-4: Click on figure to enlarge. The linearity of a turbine meter is affected by the velocity profile (often dictated by the installation), viscosity, and temperature. All other types indicate the flow rate by making other types of measurement and associate it to the flow rate. .top-level { 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). Introduction to Air Velocity Measurement, Coriolis Flow Meter technology and applications, @media screen and (max-width:1024px){ The accuracy of turbine meters is typically given in percentage of actual rate (% AR). Turbine meters should be sized so that the expected average flow is between 60% and 75% of the maximum capacity of the meter. Similar to a pitot tube differential pressure flow meter, the insertion turbine meter is a point-velocity device. Adds Thermal Shutdown to ANY spring Figure 3-10: Click on figure to enlarge. A typical configuration consists of a single diaphragm, a chamber, and suction and discharge check valves to prevent backflow. In these turbine flow meters, very small magnets are embedded in the tips of the rotor blades. Variations include bellows-type diaphragms, hydraulically actuated double diaphragms, and air-operated, reciprocating double-diaphragms. This flow meter uses a very sensitive piston to detect the meter differential and drives a variable speed servomotor to keep it near zero. The batching controller is set with the desired target volume and, when its totalizer has counted down to zero, it terminates the batch. Modules for Digital Flow Meters, Mechanical | They are suited for 150-psig operating pressures with overpressure to a maximum of 300 psig. Density changes do not greatly affect turbine meters. As with all positive displacement pumps, piston pumps generate a pulsating flow. Helical gear meters can measure the flow of highly viscous fluids (from 3 to 300,000 cP), making them ideal for extremely Subscribe to our YouTube channel to me notified of new additions. 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. Figure 3-3: Click on figure to enlarge. There are three basic designs: peristaltic, piston, and diaphragm. Because there are minor inconsistencies in the manufacturing process, all turbine flow meters are calibrated prior to shipment. This type of meter has a sealing disc between the measuring chamber and the register. As in a reciprocating piston engine, fluid is drawn into one piston chamber as it is discharged from the opposed piston in the meter. Reciprocating piston meters are probably the oldest PD meter designs. Another way to limit wear is to keep the pressure drop across the meter below 15 psid. With liquids that do not lubricate well, maximum rotor speed must be derated to limit wear. Maximum output pressure is about 125 psig. In the rotating lobe design, two impellers rotate in opposite directions within the ovoid housing (Figure 3-3B). Insertion turbine meters can be designed for gas applications (small, lightweight rotor) or for liquid (larger rotor, water-lubricated bearings). High precision flow meters are used on engine test stands for fuel flow measurement (gasoline, diesel, alcohol, etc.). Figure 3-9: Click on figure to enlarge. 50 or more diameters if there are two elbows in different planes or if the flow is spiraling or corkscrewing. 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). 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In high-precision gas flow meter installations, high-sensitivity leaves are used to detect the pressure differential, and displacement transducers are used to measure the deflection of the leaves (Figure 3-6A). Totalizer - Water Meter, Digital Because pressure drop increases with the square of flow rate, reducing the meter to the next smaller size will raise the pressure drop considerably. Flow Meter & Totalizer - Stainless Steel, Outout All meters with moving parts require periodic testing, recalibration and repair, because wear increases the clearances. Diaphragm meters generally are calibrated for natural gas, which has a specific gravity of 0.6 (relative to air). They are available with multiple pistons, double-acting pistons, or rotary pistons. 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. The measurement chamber is cylindrical with a partition plate separating its inlet port from its outlet. In the rotating impeller meter, very coarse gears entrap the fluid and pass a fixed volume of fluid with each rotation (Figure 3-3C). Automatic meter reading (AMR) devices permit the remote retrieval of readings by utility personnel. Check valves keep the fluid flow from reversing. Rotors are typically made of a non-magnetic material, like polypropylene, Ryton, or PVDF (Kynar). 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). Lazada, Browse Alphabetically: Their operating flow range is from as low as 0.001 gpm to as high as 20,000 gpm. 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. Each PD design uses a different means of isolating and counting these volumes. In order to reduce this straight-run requirement, straightening vanes are installed. Because it affects viscosity, temperature variation can also adversely affect accuracy and must be compensated for or controlled. Also, the maximum flow through this meter is less than for the same size oscillatory piston or nutating disc meter. Rotating vane meters are regularly Rotating vane meters (Figure 3-1B) have spring-loaded vanes that entrap increments of liquid between the eccentrically mounted rotor and the casing. Learn what Pulse Output is and compare the water meters available with this feature. Such packages are equipped with dribble flow, pre-warn, or trickle-cut-off circuits. This permits a completely sealed register to be used with a mechanical drive mechanism. Flow ranges from 0.04-40 gph are typical. The helix meter is a positive displacement device that uses two radially pitched helical gears to continuously entrap the process fluid as it flows. Figure 3-8: Click on figure to enlarge. 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They can meter flow rates from 1 gpm to 65 gpm in continuous service with intermittent excursions to 100 gpm. These meters also can be used on residential water service and can pass limited quantities of dirt, such as pipe scale and fine (viz,-200 mesh or -74 micron) sand, but not large particle size or abrasive solids. The accuracy of these meters is required to be 2% of actual flow rate. Gas systems are recalibrated against a bell-jar prover--a calibrated cylindrical bell, liquid sealed in a tank. In industrial applications, however, these meters are likely to pass this threshold much sooner. This design is suited for high operating pressures (up to 5,000 psig). These meters are accurate to 0.5% of rate if the viscosity of the process fluid is both high and constant, or varies only within a narrow band. The impeller is either geared to a register or is magnetically coupled to a transmitter. Most industrial turbine flow meters are manufactured from austenitic stainless steel (301, 303, 304SS), Flow meters are devices used to measure the flow rate or quantity of a gas or liquid in a pipe. Intellectual Property Protection The piston can either be directly coupled to the diaphragm or can force a hydraulic oil to drive the diaphragm. Barstock turbine meters typically are linear to 0.25% AR over a 10:1 flow range. Terms of Use Designed to operate at Propeller meters have a rangeability of about 4:1 and exhibit very poor performance if the velocity drops below 1.5 ft/sec. Provers are repeatable on the order of 0.02%, and can operate at up to 3,000 psig and 165F/75C. Flow Meter & Totalizer - Aluminum, Digital Please verify your address. Shunt flow meters are used in gas and steam service. Temperature Connectors, Panels and Block Assemblies, Temperature and Humidity and Dew Point Meters, positive displacement flow meter, read this article, High precision flow meters are used on engine, Similar to a pitot tube differential pressure flow meter. This approach can provide high accuracy (up to 0.01% of rate) but requires removing the flow meter from service. This rate is then compared to the reading of the flow meter under test. They consist of an orifice in the main line and a rotor assembly in the bypass. Tianjin Kailong Instrument Technology Co., Ltd. Hangzhou Asmik Sensors Technology Co., Ltd. Shanghai Angji Instrument Technology Co., Ltd. Ningbo Yaoye Instrument Technology Co., Ltd. Henan Dafang Dingsheng Flow Instrument Co., Ltd. Weifang AOBO Instrument Technology Development Co.,Ltd. Figure 3-5: Click on figure to enlarge. 25 diameters for a partially open valve; and Closes air supply line On Alibaba.com, you can easily select out of our extensive collection of flow measurement tools, specifically flowmeters. By counting the number of passed isolated volumes, a flow measurement is obtained. If the range of 10:1 is insufficient, some turbine flow- meters can provide up to 100:1 turndowns if accuracy is de-rated to 1% of full scale (FS). Figure 3-7: Click on figure to enlarge. In the United States, the AWWA sets the standards for turbine flow meters used in water distribution systems. 1688.com What Is An Anemometer And What Does It Measure? Higher viscosity can produce higher accuracy, while lower viscosity and wear over time will reduce accuracy. This type of prover consists of a calibrated chamber equipped with a barrier piston (Figure 3-7). Recalibration can be done either in a laboratory or on line using a prover. If the pipe is oversized (with flow velocity under 1 ft/sec), one should select a Hall-effect pick-up and use a meter smaller than the line size. - The meter is constructed from aluminum castings with cloth-backed rubber diaphragms. Paddlewheel flow meters use a rotor whose axis of rotation is parallel to the direction of flow (Figure 3-11B). The rotors lock hydraulically and continue to turn as the flow decreases even to very low rates. The sensor transmits a pulse train to a counter or flow controller. Pressure and temperature limits depend on the materials of construction and can be as high as 350F and 1,000 psig. Under certain conditions, the pressure drop across the turbine can cause flashing or cavitation. It is possible, however, to register several K-factors for different portions of the flow range and to electronically switch from one to the other as the measured flow changes. AWWA Standard C-704 sets the accuracy criterion for propeller meters at 2% of reading. The use of capacitively coupled pick-ups or Hall-effect sensors extends the range of paddlewheel meters into the low-flow velocity region of 0.3 ft/sec. Because of the small size of the jet orifice, these meters can only be used on clean fluids and they incur a pressure drop of about 20 psid. If the process fluid viscosity is greater than 10 centipoise and the flowrate is above 20% of rated capacity, accuracy of 0.1% AR can be obtained. Check valves (or, on critical applications, double check valves) are selected to protect against backflow. These meters must meet American Water Works Association (AWWA) standards for accuracy. The tubing can be silicone-rubber or, if a more corrosion-resistant material is desired, PTFE tubing. Flow Meter & Totalizer - Nylon, Digital Turbine rotation can be detected by solid state devices or by mechanical sensors. Specifications call for 10-15 diameters of straight run upstream and five diameters of straight run downstream of the meter. No contact with process media, Low-Cost These meters are usually smaller (available in sizes down to 1/10-in diameter) and are used for measuring very low flows of viscous liquids. mechanical flow totalizer have various kinds of sensors such as dial, in-line, ultrasonic, and totalizing meters, among many others. For liquid service, a servomotor-driven oval-gear meter equalizes the pressure across the meter. Propeller meters are commonly used in large diameter (over 4 in) irrigation and water distribution systems. In some designs, only one blade is magnetic and the pulse represents a complete revolution of the rotor. Tmall Taobao World As each blade passes the coil, it generates a voltage pulse. Contact one of our flow meter and totalizer specialists today to help determine the correct product for your project. This action alternately empties and fills the four chambers. Typically, industrial flow meters operate by detecting the quantity of gas, fluid, steam, or other materials passing through or around their sensors. Type - In-Line - Threaded, Digital Because it must be nonmagnetic, the meter housing is usually made of bronze but can be made from plastic for corrosion resistance or cost savings. The turbine meter's operating temperature ranges from -200 to 450C (-328 to 840F). Read posts about valve applications, case studies, problem/solutions, industry news, and more. 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. Their primary trade-off is low cost and low accuracy (Figure 3-11A). well as operating the crank mechanism for the meter register. The rate of flow is proportional to the rate of oscillation of the piston. It is now possible to include complex linearization functions in the preamplifier of a turbine flow meter to reduce these nonlinearities. | On the register side, an opposing magnet is mounted to turn the gear. The turbine is suspended by a bearing between two hanger assemblies that also serve to condition the flow. Accuracy is not affected by pulsating flow unless it entrains air or gas in the fluid. Oscillating piston flow meters are available in 1/2-in to 3-in sizes, and can generally be used between 100 and 150 psig. What Is An Anemometer And What Does It Measure? The signal output from a Hall-effect sensor is a square wave pulse train, at a frequency proportional to the volumetric flowrate. The AWWA requires that residential water meters be re-calibrated every 10 years. 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). Easy to Use Small amounts of air entrainment (100 mg/l or less) will make the meter read only a bit high, while large quantities can destroy the rotor. pipelines (6 in or larger) through a valving system without shutting down the process. All rights reserved. Under lower pressure conditions, typical rangeability is 20:1 with 1% linearity. Meters are sized so that pressure drop is below 35 psid at maximum flow rate. A flow meter provides the ability to test the speed, ratio, and volume of both gas and liquid pipes. The shaft passes between the metering tube and the register section through a mechanical stuff Lobe meters can be furnished in 2-in to 24-in line sizes. In the rotary displacement meter, a fluted central rotor operates in constant relationship with two wiper rotors in a six-phase cycle. Lead Free Brass Residential Water Meter / Submeter, Lead Free Brass Residential Hot Water Meter / Submeter, Lead Free Brass Positive Displacement Water Meter, Mechanical, Positive Displacement Nutating Disc, Removable and cleanable strainer at inlet, Integral strainer protects meter internals, Non-tapered meter threading with NPT adapters (1/2" to 1"), Body and internals constructed of high quality materials, Glass reinforced body is extremely durable, Liquid filled register prevents condensation and provides clear visibility in all atmospheric conditions, All models are equipped for addition of pulse output, Suitable for use on hot water (up to 122F), Mechanical operation is unaffected by magnetic fields, Built in check valve prevents reverse flow, 20 pulses per gallon (0.05 gallons per pulse).