The basic rotameter is the glass tube indicatingtype. These rotameters consist of a tapered glass metering tube with ball. The user can immediately see any accumulation of dirt or other foreign matter deposited on the float or tube walls. Glass tube rotameter, glass tube flow meter, glass tube. Glass tube rotameter the tube contains a free moving float that rests on the stopper at the base of the tube. Principle the differential pressure across the annulus area is constant and the flow rate is measured as a function of the annulus area. The variable area flowmeter is one of the oldest and mature principles in flow measurement with its simple design. This free area is related to the flow rate, the weight of the float and the density. The brooks model 3 glass tube flowmeters provide a low cost means of liquid flow rate indication.
Early designs had free floats that rotated in response to changing gas and fluid. Rotameters variable area flow meters yokogawa america. Flowtech glass tube variable area flow meters rotameters are intended for general in line and bypass metering applications i. As gravity works in a vertical orientation so the tube needs to be vertically oriented.
Tansa glass tube rotameter variable area flowmeter model no. Cleaning according works standard free of oil and grease. Since the area of the flow passage increases as the float moves up the tube, the scale is approximately linear. Thie short rotameter ragk is designed for measurement of liquids and gases. The tube is made of borosilicate glass, and the float can be manufactured by metal usually stainless steel to prevent corrosion, glass or plastic. This will prevent pressure shocks, which could possibly damage the float, float stops or the glass metering tube. The tube and float assembly is easily removable while the meter.
Meters are graduated for direct reading of water and air. Glass tube rotameters the basic rotameter is the glass tube indicatingtype. Generally, the rotameter is a tube made of plastic, glass or metal combined with. The end fittings and metering tube should be inspected to make sure that they are free of. Consult malemas entire 60016002 series glass tube rotameters catalogue on. Acrylic crystal body rotameter crystal body rotameter. This free area is related to the flow rate, the weight of the float and the density and viscosity of the fluid. The tube is precision formed of borosilicate glass, and the float is precisely machined from metal, glass or plastic.
Tansa glass tube rotameter is basically a variable area flow meter. Floats typically have sharp, or metering, edges which will point to a specific reading on the scale. The float moves freely up and down in the tapered borosilicate glass tube with fluid flow from bottom to top. Flow measuring instruments, glass tube rotameter, low flow. Maxiflotm ka series glass tube rotameters are rugged, versatile and accurate variable area va flow. It is an instrument used to measure flow rate of liquids and gases and are commonly used for flow measurement. An introduction to flow measurement with rotameters azom.
Ps make high accuracy by pass glass tube rotameter. The float takes up a position where buoyancy forces and the float weight are balanced in proportion to flow rate. The metal float is usually made of stainless steel to provide corrosion resistance. Glass tube rotameter variable area flow meters brooks. The conical glass metering tube has a free rotating float. Glass tube rotameter we offer a wide range of high quality glass tube rotameters that are quite popular for offering great service and value. Readability with a glass tube meter, the main me tering elements float and. Nov 18, 2016 the variable area flowmeter is one of the oldest and mature principles in flow measurement with its simple design. Eps to avoid of electrostatic charging at gas measurement which move the float to the tube wall the ltubes are antistatic. Since this measuring method is purely mechanic, it as simple as it is reliable. Npt or flange, vertical or horizontal connections offer installation versatility.
The use of a bypass arrangement with unions or flanges and valves as illustrated in figure rp16. Pdf the flow in a floating element flow meter rotameter was studied with laser doppler anemometry lda and computational fluid dynamics cfd. It is recommended that all glass tube rotameter installations incorporate the use of a bypass arrangement for either liquid or gas service as illustrate in fig. For lowcapacity, low pressure applications we offer glass tube purge meters with stainless steel frames. Variable area flowmeter rotameter the original insatech. Rotameters work on the principle of vameters and are used. Wetted parts include borosilicate glass flow tubes, viton orings and 316 stainless steel fittings, guide rods and float stops. The rotameter variable area flowmeter is one of the oldest and mature. The pressure drop across the flow meter remains constant over the entire flow range. We use high quality raw materials to make these products and their exceptional perforamnce is a testimony of our keen attention to detail. Glass tube rotameter eureka variable area flow meters rotameters work on the principle of variable area. Glass tube rotameter manufacturers, suppliers, dealers in. With a broader range of flow rates available, glass tube rotameters are suitable for a variety of liquids and gases. An introduction to flow measurement with rotameters.
Control circuit is intrinsically safe to eex ia ii c zone 0. The pressure drop across the flow meter remains constant. Options for rotameter float materials and designs extend flow ranges for different fluids within a given rotameter tube design. When the liquid flows, the float rises until its weight is balanced by the up thrust of the fluid and the float reaches a position of equilibrium. They are accurate, reliable and simple to install and maintain. The drag force for a given fluid and float cross section is a function of flow speed squared only. The model 3 is ideal for purgetype service, chlorination, industrial process water, swimming pool, cooling water, process wastewater, seal oil systems, bearing lubrication and any corrosive liquid. This 250mm scale, economical glass tube flowmeter features 304 stainless steel case construction. The differential pressure across the annulus area is constant and. Variable area flowmeter basic fundamentals and descriptions. The float rises within the tube as the flow increases. Rotameter definition is a gauge that consists of a graduated glass tube containing a free float for measuring the flow of a fluid. Our range of by pass glass tube rotameter is widely acknowledged for their accuracy, reliability and long service life. A rotameter is also a relatively simple device that can be mass manufactured out of cheap materials, allowing for its widespread use.
The original rotameter yokogawa corporation of america. The gap between the tube and float is larger at the top to allow a greater flow to pass through the meter. As the float moves up and down within the tapered tube, the. Resistance to thermal shock, pressure and oxidation is the result of employing borosilicate glass tube bodies that can withstand pressures up to. Overview rotameter type ramc metal short stroke rotameter rakd mini rotameter ragg housing rotameter measurable flow rates water 20c min. Glass tube rotameter owing to their simplicity, lowcost but highreliability nature, these meters have found applications in a wide variety of industries including but not limited to paperfiber, steel, petrochemical, foodbeverage, airconditioning, water treatment, chemical, etc. Operating manual gt glass tube variable area flowmeter. A rotameter consists of a tapered tube, typically made of glass with a float, made either of anodized aluminum or a ceramic, actually a shaped weight, inside that is pushed up by the drag force of the flow and pulled down by gravity. The fluid flows up through the tapered tube forcing the float to a position with sufficient free area to enable the flow to pass. By pass glass tube rotameter, glass tube rotameter, by pass. Vdivde 35 k tube 75 mm 4 for sphere 6 m tube 150 mm 2. Clear glass is used which is highly resistant to thermal shock and chemical action. Readability with a glass tube meter, the main metering elements float and tube as well as the fluid being metered are clearly visible.
Rotameters, also known as variable area flowmeters. Suitable for in line installation with flanged or screwed connections with several options of materials for the. Rotameter definition of rotameter by merriamwebster. Glass tube rotameter manufacturers and supplier in delhi. In the case of glass tubes, the flow rate at the upper edge of. The rotameter consists of a plastic, metal or glass tube and float.
In the case of glass tubes, the flow rate at the upper edge of the float is read on the tube scale or an attached scale f1. Rotameter working principle animation instrumentationtools. Safetyshielded glass tube rotameters are in general use throughout industry for measuring both liquids and gases. Rotameter variable area flowmeter yokogawa philippines.