variable area flow meter installation

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variable area flow meter installation

2022.07.31
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variable area flow meter installation

Looking for more information on our people, technology and solutions? The scale of the meter can be calibrated for direct reading of air or water, or it may have a scale to read a percent of range or an arbitrary scale to be used with conversion equations or charts. Sponsored by M.S.

Silicon is abundant but also expensive and in high demand as the solar and electronics industries compete for global supplies. PN40/ ASMECl300. Variable area flow meters are simple and versatile devices that operate at a relatively constant pressure drop and provide flow measurement of liquids, gases, and steam. Install the meter vertically with the inlet port at the bottom. They can handle extremely small flow rates from 0.01 cc/min for liquids and from 0.5 cc/min for gases. Instantaneous pressurization which will stress the meter and could result in tube failure. .product-calibration-tag a{padding-left: 0px !important; background: none !important;}div#sfdcChatStart,.helpButton{display: none;}/* Reduce font on cart page for CA only */ html[lang="en-CA"] .cart-header .cart-overview, html[lang="fr-CA"] .cart-header .cart-overview{font-size: 10.5px;}@media screen and (min-width: 1024px){.product__list--wrapper h1.results.hidden-xs.hidden-sm{margin: 0 auto; width: 98.5%; padding: 0 0 10px;}}@media screen and (max-width: 1024px) and (min-width: 1366px){.product__list--wrapper h1.results.hidden-xs.hidden-sm{margin: 0 auto; width: 98.8%; padding: 0 0 10px;}}/* mini-cart dropdown on mobile */.mini-cart-modal{right: 0px;width: 368px;} @media screen and (max-width: 1024px) and (min-width: 769px){.page-articleDetailsPage .product__list--wrapper .pagination-bar.top .pagination-toolbar{width: 100%;}}@media only screen and (max-width: 640px){.page-articleDetailsPage .product__list--wrapper .pagination-bar.top .pagination-toolbar{width: inherit;}}.seo-widgets.related-products .wrapper .product.desc {font-size: 13px;line-height: 16px;letter-spacing: 0.16px;color: #696969;padding: 0px;margin-top: 12px;}.seo-widgets.related-products .wrapper .product.desc a {height: 32px;overflow: hidden;text-overflow: ellipsis;display: box;display: -webkit-box;display: -ms-box;display: -moz-box;line-clamp: 2;-webkit-line-clamp: 2;-webkit-box-orient: vertical;}/* Hide chat button on solutions page */.solutions-banner-container .chatBtn {display: none;}.incredible-expertise .incredible-expertise-left .image-container .image img{height: auto;}.one-third-two-third-container .right-section .tab-content .content-card .article-content{margin: 0 auto 0 0}a.sub-level-link.dropdown-item[href*="/resources/industry/spectris-companies"] { In the same tube, different flow rates can be handled by using different floats.

Located in Pittsburgh, Pa. and covering Western Pennsylvania, West Virginia, and New York. Nevertheless, rotameters should be used only on clean fluids which do not coat the float or the tube. 0000067598 00000 n The limitations of each design are published by the manufacturer (Figure 4).

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For measuring the medium that is easy to vaporize, crystallize and solidify, the flowmeter can choose the metal tube float flowmeter with jacket.

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0000058803 00000 n Yokogawa VA flow metersoffer simple installation and trouble-free operation while delivering highly accurate flow measurements in low flow, high pressure, and other applications.

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Do not use paste or stick type thread sealing products. Figure 2 describes a configuration where the outlet pressure (P0) is held constant, and the inlet pressure (P1) is variable. Manufacturers also often provide side rules, nomographs, or computer software for rotameter sizing. 0000064139 00000 n For dirty fluids, a filter should be installed upstream of the flowmeter. 145barg/ 2102psig, Mechanical or with electronic indicator (420mA/HART, Sturdy metal design: stainless steel or alloy, -40+150C/ +302F; max.

This process is called the Fluidized Bed Reactor.

Other float materials include carboloy, sapphire, and tantalum. -40+200C/ +392F; max.

The valve at the outlet should be used to create back pressure as required to prevent float bounce.

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Rotameters can be used to manually set flow rates by adjusting the valve opening while observing the scale to establish the required process flow rate.

<< 685 60 One gate-type variable-area flow meter resembles a butterfly valve. The more closely the float density matches the fluid density, the greater the effect of a fluid density change will be on the float position.

-196+400C/ -320+752F; max.

Either the force of gravity or a spring is used to return the flow element to its resting position when the flow lessens. Many rotameters come with a built-in valve for adjusting flow manually. Thie Short Rotameter RAGK is designed for measurement of liquids and gases. The RAGL rotametersare specifically designed for the measurement of low flows of liquid and gases. Mass-flow rotameters work best with low viscosity fluids such as raw sugar juice, gasoline, jet fuel, and light hydrocarbons.

The position of the variable area flow meters in-line float, piston, or vane is changed as the increasing flow rate opens a larger flow area to pass the flowing fluid. The tube is precision formed of borosilicate glass, and the float is precisely machined from metal, glass, or plastic. If operating conditions remain unaltered, rotameters can be repeatable to within 0.25% of the actual flow rate. /CS/DeviceRGB 0000061315 00000 n

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Select the ideal rotameter for your process needs. 0000007052 00000 n

0000056133 00000 n 0000002993 00000 n To size a rotameter for other services, one must first convert the actual flow to a standard flow. -20+100C/ -4+212F; max. Located in Pittsburgh, Pa. and covering Western Pennsylvania, West Virginia, and New York. Chlorine, on the other hand, is a very effective, time-proven chemical, but is ineffective against hard-to-kill microorganisms such as cryptosporidium; it also has some unpleasant byproducts.

Most can also be provided with position sensors and transmitters (pneumatic, electronic, digital, or fiberoptic) for connecting to remote displays or controls. 0000066779 00000 n Rotameter tubes for such safe applications as air or water can be made of glass, whereas, if breakage would create an unsafe condition, they are provided with metal tubes. trailer

Design variations include the rotamer (a float in a tapered tube), orifice/rotameter combination (bypass rotameter), open-channel variable gate, tapered plug, and vane or piston designs. The float reaches a stable position when the upward force exerted by the flowing fluid equals the weight of the float.

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Thermal expansion of liquid in a stagnated or valve isolated system. Your email address will not be published. The inlet valve should be used for throttling purposes. When moving the float flowmeter, the float and pointer should be fixed to avoid the pointer and other parts from being impacted and damaged when the float moves up and down. KROHNE Messtechnik GmbHLudwig-Krohne-Str. A change in flow rate upsets this balance of forces.

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The greater the flow, the higher the float is lifted.

Float flowmeter should be installed in a place where the environment is lower than 60 to prevent the meter from being directly exposed to rain and sun, and in a location that is convenient for installation, operation, adjustment, and safety. 0000067827 00000 n

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0000004948 00000 n The piston assembly carries a cylindrical ceramic magnet that is coupled to an external flow indicator that moves precisely in direct response to the piston movement. In addition, meter frame should be fastened to bulkhead, panel or column.

In bubbler and purge applications, the inlet pressure (P1) is held constant, and the outlet pressure (P0) is variable. When the cone and float of the flow meter are damaged or contaminated, they should be replaced and cleaned in time to avoid affecting the accuracy of the flow meter.

Variable area flow meters, like all other types of differential pressure flow meters, function on the principles of the Bernoulli equation, which states that as the flow of a fluid increases, pressure loss occurs.

Floats have a sharp edge at the point where the reading should be observed on the tube-mounted scale.

If the float of the float flowmeter fluctuates greatly and is unstable, one of the reasons may be that the fluid itself is pulsating, and the other reason is the oscillation of the flowmeter itself. Make sure your pressure, temperature, fluid and other requirements are compatible with the meter and components (including o-rings).

All variable area flow meters are available with local indicators.

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The pressure transmitter takes the back pressure and converts it to an analog signal that is sent to the control room.

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>> >> The practical temperature limit is about 400oF, but such high-temperature operation substantially reduces the operating pressure of the tube. 0000066408 00000 n /Im1 13 0 R 0000065012 00000 n /ExtGState

note: In closed thermal transfer or cooling systems, install the meter in the cool side of the line to minimize meter expansion and contraction and possible fluid leaks at the threaded connections. A wide choice of materials is available for floats, packing, O-rings, and end fittings.

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Under normal circumstances, the upstream valve should be equipped with a fully open valve, followed by a flow regulating valve, and a bypass pipeline should be installed at the position of the flowmeter, and a bypass valve should be installed. Purging with nitrogen gas reduces the possibility of developing a flammable mixture because it displaces flammable gases.

The variable area flow meter is popular for industrial flow indication because it has a linear scale, a relatively long measurement range, and low pressure drop and they are quite simple to install and maintain. If the measured medium contains magnetic substances, a magnetic filter should be installed upstream of the flowmeter.

In liquid service, the float rises due to a combination of the buoyancy of the liquid and the velocity head of the fluid. After the float flowmeter is correctly installed on the pipeline, slowly open the upstream valve to fully open when using it, and then adjust the flow with the downstream flow regulating valve.

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>> Prefer to call?Customer Care representatives are available by phone MondayFriday, from 9am5pm CST. In a rotameter (Figure 1), the metering tube is mounted vertically, with the small end at the bottom.

Purge meters are quite useful in adding nitrogen gas to the vapor spaces of tanks and other equipment.

When installing a flowmeter on a pipeline that may cause fluid backflow, to avoid damage to the flowmeter due to fluid backflow or water hammer, a check valve should be installed downstream of the flowmeter.

Variable Area flow meters measure volumetric flow of liquids and gases.

Flange: DN15150/ 6"; also NPT, G, hygienic connections, etc.

How Hedland Variable Area Flow Meters Work, API Oil/Caustic and Corrosive Liquid Meter, All results for "{{searchTermVis ? 0000065231 00000 n

}. The second design has a metallic meter body for applications up to 1,000 psig. 0000003797 00000 n With gases, buoyancy is negligible, and the float responds mostly to the velocity head.

As the float rises, the size of the annular opening increases. They are particularly well suited for steam applications, where glass tubes are unacceptable. /Im3 17 0 R

Meters with plastic fittings must be installed so that fittings are not made to support any part of the associated plumbing.

220barg/ 3190psig, Glass tube with analogue scale, valve and switches, -5+100C/ +23+212F; max.

For higher pressures and temperatures beyond the practical range of glass, metal tube rotameters can be used.

744 0 obj<>stream Yokogawas rotameter series features various materials and designs including glass, plastic, and metal metering tubes as well as additional features suited for a range of mediums and applications.

An orifice is positioned within the piston assembly and forms an annular opening with the contoured metering cone. Metal Tube Flow MetersMetal tube flow meters are used for services where high operating pressure, a high temperature range, water hammer, or other forces would damage glass metering tubes.

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They are used to protect instruments from contacting hot and corrosive fluids, to protect pressure taps from plugging, to protect the cleanliness of optical devices, and to protect electrical devices from igniting upon contact with combustibles. This reading is then compared to a correlation table for a given gas or liquid to get the actual flow in engineering units. Its operation is simple: in order to pass through the tapered tube, the fluid flow raises the float. 0000003182 00000 n

With our newsletter, you will receive up-to-date information on trends and developments in the various industries, our products and solutions as well as information on our trade fairs and academies.

The purge-flow regulator is reliable, intrinsically safe, and inexpensive.

This is because a direct reading device is accurate for only one specific gas or liquid at a particular temperature and pressure.

Flange: DN1550/ 2"; also NPT, G, hygienic connections, etc. /BleedBox[0 0 612 792] stream Jacobs & Associates, a manufacturers representative and distributor of industrial instrumentation, control valves & process controls. The most common size is a glass tube rotameter with 1/4 in (6 mm) connections, a range of 0.05-0.5 gpm (0.2-2.0 lpm) on water or 0.2-2.0 scfm (0.3-3.0 cmph) in air service. 0000065615 00000 n

Operating under the variable area flow principle, rotameters use a simple design in which a float rises inside a conically shaped glass tube as the flow increases and its position on the scale gives the flow rate.

Figure 1: A Number of Variable Area Flow Meter Designs, Temperature Connectors, Panels and Block Assemblies, Temperature and Humidity and Dew Point Meters. They also can be used in applications where high operating pressures, water hammer, or other forces could damage glass tubes.

1000barg/ 14500psig, Mechanical or with electronicbargraph indicator (420mA/HART.

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Metal-tube rotameters are readily available as flow transmitters for integration with remote analog or digital controls. Can't find your region?

The RAGN Rotameter is designed for continuous flow measurement of liquids and gases. When replacing the flow meter and cleaning the measuring pipeline, there should be enough space on-site, and necessary valves should be installed upstream and downstream of the flow meter.

(If necessary, a surge chamber should be installed. 1barg/ 14.5psig, Plastic tube with scale and a MIN/MAX switch, 0+100C/ +32+212F; max.

The cost of a large rotameter installation can be reduced by using an orifice bypass or a pitot tube in combination with a smaller rotameter.

Telephone: 800-348-0089 or MSJacobs.com. Please verify your address.

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display: none !important; Capable of operating in any position in high-temperature and corrosive applications, Hedland meters are easy to read and built for use in rugged environments. Hedland Variable Area flow meters provide a quick, visual flow indication on an easy-to-read linear scale to confirm that flow systems are operating properly.

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The measurement technique is dependent on the density, viscosity and temperature of the medium.

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While not nearly as convenient as a direct reading device, a correlation meter is more accurate. /T1_0 97 0 R

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/ArtBox[0 0 612 792] Badger Meter is an industry-leading innovator in flow measurement, water quality and control products, serving water utilities, municipalities and commercial and industrial customers worldwide.

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HWnH}W{a+E` $3Y$`}][aq. 0000066119 00000 n Metal-tube rotameters can be used for hot and strong alkalis, fluorine, hydrofluoric acid, hot water, steam, slurries, sour gas, additives, and molten metals. In-line 316 stainless steel fittings are standard.

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A calibrated spring opposes flow in the forward direction, decreasing viscosity sensitivity. The position of the float, piston, or vane provides a direct visual indication of flow rate. When no flow exists, the float rests at the bottom. The back pressure of the introduced gas is a function of the liquid level or head in the tank.

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For improved reading accuracy, a glass-tube rotameter should be installed at eye level. Tapered plug flow meters are variable area flow meters with a stationary core and a piston that moves as the flow varies. Bypass rotameters are often provided with isolation valves so that they can be removed for maintenance without shutting down the process line. 0000068186 00000 n << The scale can be calibrated for direct reading of air or water or can read percentage of range. 0000067488 00000 n

When the flow meter is out of use, slowly close the fully open valve, and then close the flow control valve.

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End fittings are available in metal or plastic. It also is possible to operate a rotameter in a vacuum. /Font

The meter can be used on oil, water, and air, and is available in sizes up to 4 inches. Variable area (VA) flow meters, or rotameters, are some of the oldest devices used for flow measurement, known for their flexibility across various applications and high reliability.

For applications requiring a wide measurement range, a dual-ball rotameter can be used. When the metal tube float flowmeter is used, when the shell has a ground terminal, it must be reliably grounded during installation and use. It also is used as an indicating flow switch in safety interlock systems.

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overflow:hidden; The inaccuracy of such meters is 2-5% FS. VA flow metersconsist of a cone, float, scale, and process connection. If there is leakage in the flowmeter in use, the compression bolts or nuts should be evenly tightened.

With plastic end fittings, care must be taken in installation to not distort the threads. << 0000003609 00000 n

Stay in touch with us to get latest news and special offers. }. Correlation charts are readily available for nitrogen, oxygen, hydrogen, helium, argon, and carbon dioxide.

This instrument has two ball floats: a light ball (typically black) for indicating low flows and a heavy ball (usually white) for indicating high flows. The same-size bypass rotameter can be used to measure a variety of flows, with the only difference between applications being the orifice plate and the differential it produces.

/Properties In general, there is a linear relationship between operating temperature and pressure. When in use, the flow rate indication of the flow meter should be read according to the reading requirements of the flow meter.

Representing top lines in pressure, temperature, level, flow, analytical instruments and industrial valves. 0

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In the 1990s, Yokogawa strengthened its focus on flow meters through cooperation with and the eventual acquisition of the German flow meter manufacturer ROTA.

endobj The variable area flow meters operation is based on the variable area principle: fluid flow raises a float in a tapered tube, increasing the area for passage of the fluid. Download our user-friendly Rotameter Sizing Program to build the correct rotameter for your application.

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Use an appropriate amount of teflon tape on external pipe threads before making connections.

Flange: DN1525/ 1"; also NPT, G, hygienic connections, etc. The reading position of the float flowmeter, 2.

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<< /CS0 100 0 R The following are helpful, general guidelines in the proper installation of rotameters: Sponsored by M.S.

The plant operator will then be able to monitor the exact level in the tank. With liquids, the float is raised by a combination of the buoyancy of the liquid and the velocity head of the fluid.

This technology is based on the variable area principle, where flow raises a float in a tube, increasing the area for passage of the fluid through the meter.

are different from the state when the flowmeter is scaled, the scale conversion of the flowmeter must be carried out. What Is An Anemometer And What Does It Measure? Representing top lines in pressure, temperature, level, flow, analytical instruments and industrial valves. >> Most rotameters are relatively insensitive to viscosity variations.

A small but uninterrupted flow of air or inert gas is forced down through a dip tube which extends to near the bottom of the tank.

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Several shapes of float are available for various applications.

0000003645 00000 n In order to facilitate maintenance.

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If there is a tilt, it should be less than 2. One such instrument has a black measuring range from 235-2,350 ml/min and a white to 5,000 ml/min. Purge and bypass rotameter errors are in the 5% range. 0000006156 00000 n As a result, Yokogawa gained access to 100 years of flow meter expertise and completed its flow meter portfolio by adding the Rotameter (variable area) and Rotamass (Coriolis) product lines.

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/CropBox[0 0 612 792] The rotameter is the most widely used variable are flowmeter because of its lost cost, simplicity, low pressure drop, relatively wide rangeability, and linear output. Jacobs & Associates, a manufacturers representative and distributor of industrial instrumentation, control valves & process controls. /Im0 11 0 R /Resources searchTermVis : searchTerm}}", Showing units in {{data.selectedUnit == "us" ? Metal tube flow meters can be used for most fluids, including corrosive liquids and gases.

0000001530 00000 n As shown in Figure 2 purge meters can operate in the constant flow mode, where P2 P0 is held constant at about 60 to 80 in H20 differential.

What Is An Anemometer And What Does It Measure?

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The float then moves up or down, changing the annular area until it again reaches a position where the forces are in equilibrium. >> Meters with all plastic construction are available for applications where metal wetted parts cannot be tolerated, such as with deionized water or corrosives. 0000005363 00000 n Rotameters are inherently self-cleaning because, as the fluid flows between the tube wall and the float, it produces a scouring action that tends to prevent the buildup of foreign matter.

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The RAKD Rotameter is used for measurement of liquids and gases and is highly accurate, particularly for low flows and high pressure applications.

In general, glass tube rotameters can measure flows up toa bout 60 gpm water and 200 scfh air. In the case of metal rotameters such as the RAMC, the special shape of the float results in less dependence on viscosity at lower viscosities.

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The float moves up and down in proportion to the fluid flow rate and the annular area between the float and the tube wall.

Laboratory rotameters can be calibrated to an accuracy of 0.50% AR over a 4:1 range, while the inaccuracy of industrial rotamers is typically 1-2% FS over a 10:1 range.

Handle the meter carefully during installation. /Rotate 0 They are typically constructed of polycarbonate, with either metal or plastic end fittings.

Floats typically are machined from glass, plastic, metal, or stainless steel for corrosion resistance. The number of Biodiesel processing plants has grown to over 2500 in the US alone. If the viscosity limit is exceeded, the indicated flow must be corrected for viscosity.

Safety-shielded glass tube variable area flow meters are in general use throughout industry for measuring both liquids and gases.

<]>> Inspect meter for damage that may have occurred during shipping.

Figure 8-5 shows the reading position of the metal tube float flowmeter, Your email address will not be published. The borosilicate glass metering tube has a brightly colored easy-to-read scale.

Variable area meters measure volumetric flow of liquids and gases.

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Some fluids attack the glass metering tube, such as wet stream or high-pH water over 194oF (which can soften glass); caustic soda (which dissolves glass); and hydrofluoric acid (which etches glass). The user can connect a straight pipe section that protects the exposed part of the connecting rod, and it can be disassembled and assembled at the same time as the flowmeter during installation.

Our line of Hedland products features over 18,000 inline variable area flow meters suitable for oil, phosphate esters, water, water-based liquids and compressed gases. 0000064310 00000 n 0000067956 00000 n However, it is important to note that because the float position is gravity dependent, variable area flow meters must be vertically oriented and mounted.

>> Doppler Vs Transit Time Ultrasonic Meters. /GS0 102 0 R

Remember: To get a correct reading of flow in gas service, it is necessary to know the pressure right at the outlet of the meter (before the valve).

Meters with stainless steel fittings will support several feet of pipe as long as significant vibration or stress resulting from misaligned pipe are not factors. 0000068307 00000 n

If the rotameter has a valve, it must be placed at the outlet at the top of the meter.

2 0 obj Such instrumentation packages are used as self-contained purge flow meters (Figure 2).

Save my name, email, and website in this browser for the next time I comment. Exact results can be expected only if the characteristics of the medium remain constant. <<

The height of the float is directly proportional to the flow rate.

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The fluid to be measured enters at the bottom of the tube, passes upward around the float, and exits the top. 0000003227 00000 n

Multiple tube flow meters allow up to six rotameters to be mounted in the same frame.

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0000062871 00000 n 0000064854 00000 n The conical glass metering tube has a free rotating float. Flow through the meter forces a spring-loaded vane to rotate, and a mechanical connection provides local flow rate indication.

The float shape does affect the viscosity limit. Typical accuracy is 5% FS over a 10:1 range, and the most common pressure rating is 150 psig (1 MPa).

4barg/ 58psig, Glass tube with easy-to-read scale, MIN/MAX switches, Rugged steel plate housing for higher process safety, Flange: DN1550/ 2", max. 2022 Badger Meter, Inc. All rights reserved. One early design had slots, which caused the float to spin for stabilizing and centering purposes.

data.usLabel : data.metricLabel}}, Heating, Ventilation & Air Conditioning (HVAC), Switch to {{data.selectedUnit == "us" ? For this reason, it is necessary to size the rotameter for each application.

/Filter/FlateDecode 0000066533 00000 n When sized correctly, the flow rate can be determined by matching the float position to a calibrated scale on the outside of the rotameter. Plastic-tube rotameters are low-cost rotameters that are ideal for applications involving corrosive fluids or deionized water. No.9-1 Haifu Road Dalian Bonded Area Pilot Free Trade Zone Liaoning China 116001, The premier global supplier and export of exceptional instruments and industry products, When it comes to Instrumentation, we are the one you need!

In one design, the piston movement mechanically moves a pointer, while in another it magnetically moves an external flow rate indicator.