Figure 3-9 shows a typical turbine-meter calibration curve describing the relationship between flow and K-factor (pulses/gallon). Another way to limit wear is to keep the pressure drop across the meter below 15 psid. The diameter of the rotor is very slightly less than the inside diameter of the metering chamber, and its speed of rotation is proportional to the volumetric flow rate. This permits a completely sealed register to be used with a mechanical drive mechanism. Customer reviews of products and testimonials are also included. Flow capacity is 8-10 gpm to 18,000 gpm in the larger sizes. | Suppliers Higher viscosity can produce higher accuracy, while lower viscosity and wear over time will reduce accuracy. However, the presence of any of the following obstructions upstream would necessitate that there be more than 15 diameters of upstream straight-pipe runs Typically, industrial flow meters operate by detecting the quantity of gas, fluid, steam, or other materials passing through or around their sensors. The primary difference is that gases are compressible. Turbine rotation can be detected by solid state devices (reluctance, inductance, capacitive and Hall-effect pick-ups) or by mechanical sensors (gear or magnetic drives). Mechanical wear, straightening, and conditioning requirements are the same as for turbine meters. they are machined from stainless steel hexagonal barstock. PD gas meters operate by counting the number of entrapped volumes of gas passed, similar to the way PD meters operate on liquids. Helical gear meters can measure the flow of highly viscous fluids (from 3 to 300,000 cP), making them ideal for extremely The choice of these depends on whether the volumetric or mass flow rate is to be measured. Therefore, the pressure drop across the meter limits the allowable maximum flow in high viscosity service. 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. .top-level { Recalibration can be done either in a laboratory or on line using a prover. Learn what Pulse Output is and compare the water meters available with this feature. ing box, turning a geared mechanical register assembly to indicate flow rate and actuate a mechanical totalizer counter. Nutating disc meters are designed for water service and the materials of which they are made must be checked for compatibility with other fluids. Selection of Valves. used in the petroleum industry and are capable of metering solids-laden crude oils at flow rates as high as 17,500 gpm. /* Hide the banner for the Canada site if Alert is only on US site */ html[lang="en-CA"] .alert-banner, html[lang="fr-CA"] .alert-banner { /*display: none !important;*/ } /* Apply look/feel changes to Alert messaging */ .alert-banner a { color: #fff; } .alert-banner a:hover { text-decoration: underline; } .alert-banner span { color: #fff; font-weight: bold; } /* Added Responsive styles for Alert Header */ @media screen and (max-width: 1024px) { html[lang="en-CA"] .alert-banner, html[lang="fr-CA"] .alert-banner { /*display: none !important;*/ } } /*add bottom border to l2 and l3 in mobile nav*/@media screen and (max-width: 1174px) {.main-menu .sub-level li.no-submenu .cat-level-two a, .main-menu .sub-level-two li .cat-level-three a {border-bottom:solid 1px #ddd;white-space: pre-wrap;}.main-menu .sub-level-two li .cat-level-three a{padding: 10px 20px;}}.pageType-CategoryPage .productcarouselcomponent-container .carousel__component.carousel-wrapper h2{top:0}. Because of the close tolerances of the piston and cylinder sleeve, a flushing mechanism must be provided in abrasive applications. 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. The resulting K-factor in pulses per volume unit will vary within the stated linearity specification. 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. Selecting the correct flow meter for your application requires writing a flow specification, which covers the use of the meter. As in a reciprocating piston engine, fluid is drawn into one piston chamber as it is discharged from the opposed piston in the meter. Onetouch The sensor transmits a pulse train to a counter or flow controller. The rotation of the vanes moves the flow increment from inlet to outlet and discharge. Gas turbine meters are available from 2" to 12" and with flow ratings up to 150,000 ft3/hr. The minimum upstream straight pipe-run requirement is 20 pipe diameters. This type of metering pump is used in laboratories, in a variety of medical applications, in the majority of environmental sampling systems, and also in dispensing hypochlorite solutions. Tmall Taobao World 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). Such packages are equipped with dribble flow, pre-warn, or trickle-cut-off circuits. The batching controller is set with the desired target volume and, when its totalizer has counted down to zero, it terminates the batch. John Ernst flow meter sizes range from 1/8 inch to 8 inches. The piston can either be directly coupled to the diaphragm or can force a hydraulic oil to drive the diaphragm. This particular meter has a linearity tolerance band of 0.25% over a 10:1 flow range and a 0.15% linearity in a 6:1 range. The outputs of reluctance and inductive pick-up coils are continuous sine waves with the pulse train's frequency proportional to the flow rate. Because Hall-effect sensors have no magnetic drag, they can operate at lower flow velocities (0.2 ft/sec) than magnetic pick-up designs (0.5-1.0 ft/sec). - When operating at elevated gas pressures (1,400 psig), a rangeability of 100:1 can be obtained in larger size meters. Read posts about valve applications, case studies, problem/solutions, industry news, and more. & Digital Flow Meter - Wafer. The best attainable accuracy is about 0.2% or rate. Hangzhou Sinomeasure Automation Technology Co., Ltd. Henan Weisidun Import And Export Trade Co., Ltd. How to souce products on Alibaba.com effectively? Several quality mechanical flow totizer are on sale at affordable prices, and you can pick from the wide types of flow meters available. mechanical flow totalizer from Alibaba.com are suitable for various fluids with different pressures and volume. 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. return pneumatic actuator! To minimize the pulsation, multiple pistons or pulsation-dampening reservoirs are installed. Piston pumps are sized on the basis of the displacement of the piston and the required flow rate and discharge pressure. The lobe gear meter is available in a wide range of materials of construction, from thermoplastics to highly corrosion-resistant metals. Each pulse represents a discrete volume of liquid. The volumetric accuracy of bell-jar provers is on the order of 0.1% by volume, and provers are available in discharge volumes of 2, 5, 10 ft3 and larger. have a small jet orifice that projects the fluid onto a Pelton wheel. mechanical flow totalizer offered on the site have wide minimum and maximum pressure ranges, which is considered to be a desirable quality as they can be used for a wider variety of fluids. These mechanical flow totalizer are from reliable brands and designed to provide the highest accuracy measurements. Lobe meters can be furnished in 2-in to 24-in line sizes. 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Hot water units are available up to 250F. See all of the accessories offered for our water meters. | Dual-rotor liquid turbines increase the operating range in small line size (under 2 in) applications. Rotors are typically made of a non-magnetic material, like polypropylene, Ryton, or PVDF (Kynar). View our entire library of videos. Capacitive sensors produce a sine wave by generating an RF signal that is amplitude-modulated by the movement of the rotor blades. Subscribe to our YouTube channel to me notified of new additions. 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. Instead of pick-up coils, Hall-effect transistors also can be used. The accuracy of these meters is required to be 2% of actual flow rate. Liquid systems can be calibrated in the laboratory against either a calibrated secondary standard or a gravimetric flow loop. By counting the number of passed isolated volumes, a flow measurement is obtained. As the bell is lowered, it discharges a known volume of gas through the meter being tested. All positive displacement flow meters operate by isolating and counting known volumes of a fluid (gas or liquid) while feeding it through the meter. Batching flow computers are readily available, as are analog and intelligent digital transmitters. Figure 3-11: Click on figure to enlarge. Check valves keep the fluid flow from reversing. The oval gear PD meter uses two fine-toothed gears, one mounted horizontally, the other vertically, with gears meshing at the tip of the vertical gear and the center of the horizontal gear (Figure 3-3A). It is therefore important to calibrate the meter for the specific fluid it is intended to measure. Whether you are looking for magnetic flow meters, hydraulic flow sensor, or flow flowment, you are likely to find a type of flow measment tool. 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). This design is suited for high operating pressures (up to 5,000 psig). 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. This type of prover consists of a calibrated chamber equipped with a barrier piston (Figure 3-7). They can be hot-tapped into existing Shunt flow meters are used in gas and steam service. Flow Meter & Totalizer - Nylon, Digital The two rotors turn in opposite directions. Most paddlewheel meters have flat-bladed rotors and are inherently bi-directional. Specifications call for 10-15 diameters of straight run upstream and five diameters of straight run downstream of the meter. The shaft passes between the metering tube and the register section through a mechanical stuff On the register side, an opposing magnet is mounted to turn the gear. Repeatability is generally not greatly affected by changes in viscosity, and turbine meters often are used to control the flow of viscous fluids. 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. Generally, turbine meters perform well if the Reynolds Number is greater than 4,000 and less than or equal to 20,000. There are three basic designs: peristaltic, piston, and diaphragm. The piston is also cylindrical and is punctured by numerous openings to allow free flow on both sides of the piston and the post (Figure 3-2A). Small turbine meters often are called barstock turbines because in sizes of 3/4 in to 3 in. Optical or magnetic sensors are used to encode a pulse train proportional to the rotational speed of the helical gears. Also, the maximum flow through this meter is less than for the same size oscillatory piston or nutating disc meter. Turbine meters are sensitive to upstream piping geometry that can cause vortices and swirling flow. This type of meter has a sealing disc between the measuring chamber and the register. Because it affects viscosity, temperature variation can also adversely affect accuracy and must be compensated for or controlled. Alipay Mechanical registers can be equipped with mechanical or electronic ticket-printers for inventory control and point-of-use sales. Find the most appropriate mechanical flow totalizer from Alibaba.com for a variety of engineering and industrial purposes. Typically, either a crankshaft or a horizontal slide is used to control the opening and closing of the proper orifices in the meter. Flow meters are also commonly referred to as flow gauge, flow indicator, and liquid meter. 25 diameters for a partially open valve; and 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. The front one acts as a conditioner, directing the flow to the back rotor. Variations include bellows-type diaphragms, hydraulically actuated double diaphragms, and air-operated, reciprocating double-diaphragms. In some designs, only one blade is magnetic and the pulse represents a complete revolution of the rotor. The helix meter is a positive displacement device that uses two radially pitched helical gears to continuously entrap the process fluid as it flows. As they rotate, a fixed volume of liquid is entrapped and then transported toward the outlet. Other types of rotary element flow meters include the propeller (impeller), shunt, and paddlewheel designs. Doppler Vs Transit Time Ultrasonic Meters. They provide good repeatability (better than 0.015% AR) at high flows and can be used at high operating pressures (to 1,200 psig) and temperatures (to 400F). High precision flow meters are used on engine test stands for fuel flow measurement (gasoline, diesel, alcohol, etc.). Figure 3-3: Click on figure to enlarge. - If you want to learn more about positive displacement flow meter, read this article. At low flow, the output (the height of the voltage pulse) may be on the order of 20 mV peak-to-peak. Errors were found with the address you provided. This flow meter uses a very sensitive piston to detect the meter differential and drives a variable speed servomotor to keep it near zero. 20 diameters for 90 elbow, tee, filter, strainer, or thermowell; The calibration for the new flow rating (QN) is obtained by multiplying the meter's flow rating for natural gas (QC) by the square root of the ratio of the specific gravities of natural gas (0.6) and the new gas (SGN): High-precision gas meters are usually a hybrid combining a standard PD meter and a motor drive that eliminates the pressure drop across the meter. What Is An Anemometer And What Does It Measure? These transistors change their state when they are in the presence of a very low strength (on the order of 25 gauss) magnetic field. The tubing can be silicone-rubber or, if a more corrosion-resistant material is desired, PTFE tubing. Intellectual Property Protection Keeping the minimum flow reading above this region will permit linearity to within 0.15% on small and 0.25% on larger turbine meters. Cold water service units are temperature-limited to 120F. A flow meter provides the ability to test the speed, ratio, and volume of both gas and liquid pipes. This action alternately empties and fills the four chambers. & Piston - Variable Area, Shuttle | Showroom Figure 3-10: Click on figure to enlarge. Some corrosion-resistant designs are made from plastic materials such as PVC. The AWWA requires that residential water meters be re-calibrated every 10 years. Most turbine meters are designed for maximum velocities of 30 ft/sec. 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 follower magnet can be used to drive either a transmitter, a register, or both. B2-20120091-4. Under certain conditions, the pressure drop across the turbine can cause flashing or cavitation.
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