>> When using, it is necessary to prevent sudden changes in the pressure of the fluid to be measured and to prevent the float from damaging the glass cone. Small glass tube rotameters are suitable for working with pressures up to 500 psig, but the maximum operating pressure of a large (2-in diameter) tube may be as low as 100 psig. Other float materials include carboloy, sapphire, and tantalum. Metal-tube rotamers are available in diameter sizes from 3/8 in to 4 in, can operate at pressures up to 750 psig, temperatures to 540oC (1,000F), and can measure flows up to 4,000 gpm of water of 1,300 scfm of air. 0000003645 00000 n
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/TrimBox[0 0 612 792] 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. 0000006519 00000 n
Purge and bypass rotameter errors are in the 5% range. 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. /Parent 90 0 R The position of the float, piston, or vane provides a direct visual indication of flow rate. In addition, meter frame should be fastened to bulkhead, panel or column. Can't find your region? 0000003419 00000 n
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What Is An Anemometer And What Does It Measure? This process is called the Fluidized Bed Reactor. Manufacturers also often provide side rules, nomographs, or computer software for rotameter sizing. 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 basic variable area flow meter is the glass tube indicating type. xref
/Im3 17 0 R While not nearly as convenient as a direct reading device, a correlation meter is more accurate. startxref
Errors were found with the address you provided. The tube is precision formed of borosilicate glass, and the float is precisely machined from metal, glass, or plastic. The transmitter can be intrinsically safe, microprocessor-based, and can be provided with alarms and a pulse output for totalization. The black ball is read until it goes off scale, and then the white ball is read. According to preliminary calculations, if the flowmeter is tilted 10, an additional error of 0.8% will occur. << To effectively control and optimize industrial processes, trusting measurements from flowmeters is vital. Their main application is to control small gas or liquid purge streams. An orifice is positioned within the piston assembly and forms an annular opening with the contoured metering cone. Figure 8-5 shows the reading position of the metal tube float flowmeter, Your email address will not be published. After the installation and connection are completed, the power supply can be switched on and put into use after checking that it is correct. 0000003722 00000 n
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A correlation flow meter can be used with a wide variety of fluids and gases under various conditions. 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. /CS1 67 0 R Report any damage to the container to the freight carrier immediately. One gate-type variable-area flow meter resembles a butterfly valve. Flow through the meter forces a spring-loaded vane to rotate, and a mechanical connection provides local flow rate indication. 0000002993 00000 n
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To satisfy the force equation, the variable area flow meter float assumes a distinct position for every constant flowrate.
With gases, buoyancy is negligible, and the float responds mostly to the velocity head. The scale can be calibrated for direct reading of air or water or can read percentage of range. They can handle extremely small flow rates from 0.01 cc/min for liquids and from 0.5 cc/min for gases. 0000066408 00000 n
They also can be used in applications where high operating pressures, water hammer, or other forces could damage glass tubes. The borosilicate glass metering tube has a brightly colored easy-to-read scale. End fittings are available in metal or plastic. 0000067136 00000 n
/C2_0 95 0 R /Rotate 0 Use an appropriate amount of teflon tape on external pipe threads before making connections. 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). Glass tubes are most common being precision formed of safety shielded borosilicate glass. Purging with nitrogen gas reduces the possibility of developing a flammable mixture because it displaces flammable gases. 220barg/ 3190psig, Compact mechanical indicator, optional 420 mA/HART, -40+200C/ +392F, max. Please verify your address. The inlet valve should be used for throttling purposes. Install the meter vertically with the inlet port at the bottom. 0000065231 00000 n
10barg/ 145psig, For use in gas supply lines of furnaces, protective gas or heating systems, Flange: DN1540/ 1"; also NPT, G, hose connection, -20+100C/ -4+212F; max. Meters with plastic fittings must be installed so that fittings are not made to support any part of the associated plumbing. /XObject Transmitters usually detect the float position through magnetic coupling and are often provided with external indication through a rotatable magnetic helix that moves the pointer. Do not use paste or stick type thread sealing products. >> /MC1 7 0 R With gas flow, buoyancy is negligible, and the float responds to the velocity head alone. Many rotameters come with a built-in valve for adjusting flow manually. It also is used as an indicating flow switch in safety interlock systems. The meter also can be installed directly after a pipe elbow without adverse effect on metering accuracy. Ozone is recognized among the strongest, fastest, commercially available disinfectants and oxidants for water treatment, Ozone is used in both the disinfection of drinking water and bacterial killer in waste water treatment. 2 0 obj (If necessary, a surge chamber should be installed. Thermal expansion of liquid in a stagnated or valve isolated system. Located in Pittsburgh, Pa. and covering Western Pennsylvania, West Virginia, and New York. Tapered plug flow meters are variable area flow meters with a stationary core and a piston that moves as the flow varies.
The greater the flow, the higher the float is raised. VA flow metersconsist of a cone, float, scale, and process connection. The float reaches a stable position when the upward force exerted by the flowing fluid equals the weight of the float. 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. In general, glass tube rotameters can measure flows up toa bout 60 gpm water and 200 scfh air. >> When necessary, a washing pipe should be installed to regularly flush the flowmeter and measuring pipe. In order to facilitate maintenance. Otherwise, the cleanliness of the float will affect the measured value of the flowmeter. 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. When fluid enters, the metering float begins to rise. 0000003156 00000 n
Telephone: 800-348-0089 or MSJacobs.com. /CS0 100 0 R This reading is then compared to a correlation table for a given gas or liquid to get the actual flow in engineering units. 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. With liquids, the float is raised by a combination of the buoyancy of the liquid and the velocity head of the fluid. /ArtBox[0 0 612 792] Plastic-tube rotameters are low-cost rotameters that are ideal for applications involving corrosive fluids or deionized water. For sales & general inquiriesMunicipal Water solutions: (800) 6163837 Commercial & Industrial solutions: (877) 2431010Wyco Concrete solutions: (800) 233-9926, For product supportMunicipal Water solutions: (800) 6163837 Commercial & Industrial solutions: (877) 2431010Wyco Concrete solutions: (877) 2431010. }. For the electric remote transmission metal tube float flowmeter, the power supply and output are connected to the outside with a four-core plug. Tables listing standard water equivalent gpm and/or air scfm values are provided by rotameter manufacturers. 0000004948 00000 n
>> Meters with all plastic construction are available for applications where metal wetted parts cannot be tolerated, such as with deionized water or corrosives. 0000067342 00000 n
Select the ideal rotameter for your process needs. As this area increases, the differential pressure across the float decreases. /Length 6589 0000065492 00000 n
The reading position of the float flowmeter, 2. << In-line 316 stainless steel fittings are standard. Such instrumentation packages are used as self-contained purge flow meters (Figure 2).
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. The back pressure of the introduced gas is a function of the liquid level or head in the tank. If the former is the cause, the piping system should be improved, if the latter is the cause It should be eliminated in response to specific problems. 0000066533 00000 n
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. Most rotameters are relatively insensitive to viscosity variations. 145barg/ 2102psig, Mechanical or with electronic indicator (420mA/HART, Sturdy metal design: stainless steel or alloy, -40+150C/ +302F; max. The RAKD Rotameter is used for measurement of liquids and gases and is highly accurate, particularly for low flows and high pressure applications. Handle the meter carefully during installation. /T1_2 69 0 R 0000007052 00000 n
Correlation charts are readily available for nitrogen, oxygen, hydrogen, helium, argon, and carbon dioxide. Liquids with fibrous materials, abrasives, and large particles should also be avoided. 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. It also is possible to operate a rotameter in a vacuum. 0000065111 00000 n
/MC2 9 0 R Yokogawa VA flow metersoffer simple installation and trouble-free operation while delivering highly accurate flow measurements in low flow, high pressure, and other applications. Several shapes of float are available for various applications. /Im1 13 0 R The float moves up and down in proportion to the fluid flow rate and the annular area between the float and the tube wall. searchTermVis : searchTerm}}", Showing units in {{data.selectedUnit == "us" ? 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. If the viscosity limit is exceeded, the indicated flow must be corrected for viscosity. /StructParents 1 Download our user-friendly Rotameter Sizing Program to build the correct rotameter for your application. When in use, the flow rate indication of the flow meter should be read according to the reading requirements of the flow meter. For improved reading accuracy, a glass-tube rotameter should be installed at eye level. stream /Im2 15 0 R Metal-tube rotameters can be used for hot and strong alkalis, fluorine, hydrofluoric acid, hot water, steam, slurries, sour gas, additives, and molten metals. The valve at the outlet should be used to create back pressure as required to prevent float bounce.
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