Variable area flowmeter v31 housing in stainless steel borosilicate glass only 4 sealing rings service kind construction replace v16 v15 v30 limit switches options chip guard operating principle the measuring element is composed of a float and a conical glass tube. Hedland variable area flow meters rotameters are the industry benchmark. Variable area glass flowmeters are designed with easy to read scales. It is a reliable instrument for measuring and monitoring liquid and gas flows. Glass and metal tube purgemeters for lowflow applications flow sizes from 0. A rotameter requires no external power or fuel, it uses only the inherent properties of the fluid, along with gravity, to measure flow rate. Variable area flow meter model c is a high quality acrylic flow meter.
The developed formula relates pressure drop with the flow rate of a given fluid passing through the orifice. One gatetype variable area flowmeter resembles a butterfly valve. Variable area flow meter model vlfh is a sturdy industrial flow meter with dn or ansi flange connections. They combine tried and tested flow measurement with latest. Variable area flow meters rotameters brooks instrument. If using a control valve it should be placed at the inlet side of the flow tube. Flow through a large penstock such as used at a hydroelectric power plant can be measured by averaging the flow velocity over the entire area. Flow meters, f l o w m o n i t o r s flow switches and.
Actual flow is indicated by the top of the float and can be directly read from the scale on the metering tube. For simple and costeffective flow measurement of gases or liquids without auxiliary power. All fluoropolymer flowmeters offer solutions for measuring flow rates of highly corrosive. Model prediction for constant area, variable pressure drop. Variable area flow meter model c coriolis flowmeter, air. Inlet and outlet straight are not required as long as the flow profile is laminar. Hedland variable area flow meters and flow switches. Variable area flow meter type 350 float in pvdf with magnet with solvent cement sockets pvcu metric. Flange connections dn or ansi flow rate water up to 30 lmin flow rate air up to 900 nlmin alarmready. The flowrate scale for flowmeters with glass meter tubes is preferably applied directly on the meter tube. Enter the necessary information into the equation below and youll get the flow rate for the different fluid.
For lowcapacity, low pressure applications we offer glass tube purge meters with stainless steel frames. Variable area flowmeter ariable area flowmeter rotameter. Variable area flow meters we offer variable area flow meters available to measure oil, phosphate esters, water and waterbased fluids, as well as air and other compressed gases. The hedland inline flow meters unique springloaded variable area design allows meters to be installed in any position without affecting accuracy. The meter can be used on oil, water and air, and is available in sizes up to 4 inches.
Pressures up to 414 bar with 1 or 2 settable alarm switch outputs. The principles of operation of the variable area flowmeters are described in the vdivdeguideline 35 as follows. Variable area flow meters variable area flow meters, thermal mass flow meters, thermal mass flow controllers, multiparameter mass flow controllers, paddlewheel meters, pumps, vortex flow meters, valves, accessories, aalborg, flow meter, rotameters, mass flow meters, mass flow controllers, vortex, valves. Straight pipe runs, before or after the meter, are not required. Ideal for monitoring pump performance and media flows through hydraulic circuits and cooling systems. Asameters model cg3839 all made of stainless steel are designed for medium and high flow rates for every kind of gas mod. Fax 8002453569 3 40 45 67 2629 3032 89 1011 2629 3032 12 1415 email. The ragn is a glass tube variable area flow meter designed for continuous flow measurement of liquids and gases, featuring a borosilicate glass metering tube with a brightly colored, easytoread scale. Variable area flow meters type 335, type 350 short version. Variable area flowmeter dfm 165 to 350 lyma kemiteknik. For liquid or gas flow ranges from 2 20 mlmin up to 10 100 lmin h. A variable area meter is a type of differential pressure flow meter. G also aggressive, at extreme operating and environmental conditions high pressures andor low. Keep in mind when going to individual product pages you will have to select the size youre interested in to see the appropriate pricing.
You want to get a quick flow check on a different fluid because the process fluid is changing or you might be experimenting with the process, but you dont have a va variable area flow meter that is calibrated for the different fluid. Flow through the meter forces a springloaded vane to rotate, and a mechanical connection provides local flow rate indication. Variable area flow meter type 350 float in pvdf without magnet with solvent cement sockets pvcu metric. Measuring principle of variable area flowmeters krohne. These models have large dials with bold markings and characters that are easy to read from a distance. Variablearea flow for liquids or gases our variablearea flowmeters are designed for liquid or gas applications where rotameters often fall short. The allmechanical sensing system directly drives the pointer and remote signaling devices. Because of their low cost, variable area flowmeters are one of the most widely used types in the industry, often proving to be one of the most valid solutions for low flow applications. Max flow sizes from 15 to 160 gpm 60 to 600 lpm description these variablearea flow meters have a springloaded swinging vane. The flowrate scale for glass tube flowmeters is located directly on the meter tube. Talk to us for more on our range of flow meter types for gas and water, and see why brooks instruments leads the world in variable area flow meters. Proper mounting of your variable area flow meter for general applications where the system is venting to atmosphere the flow meter should be mounted as shown on left.
Utilizing automated calibration software and a highres vision system, our new proprietary calibration and scaling process records the unique flow profile of each meter during calibration. Propellertype current meters similar to the purely mechanical ekman current meter, but now with electronic data acquisition can be traversed over the area of the penstock and velocities averaged to calculate total flow. However, as the inside of the vaflowmeter is cone shaped widens, the area around the float through which the medium flows increases, the flow speed and drag force decrease until there is mechanical equilibrium with the. Since the device does not have its own power sources that. We generally supply two ranges of variable area flow meters or rotameters, dfm plastic va meters for vertical installation and the more advanced springloaded hedland. Suitable for metering carrier gases, liquid, and gas measurement in pilot plants, process flow, and level indicating. It is a reliable and easy to read instrument for measuring and monitoring liquid and gas flows. This capability has considerably expanded the range of applications for the variable area flow meter, since the measurement can observed remotely from the process or used for automatic control. The h250 m40 flowmeters have set a new standard in variable area flowmeter technology. The plastic variable area flow meters type 335 350 from. Usually, variablearea flow meters operate under operating. The variable area flowmeter is an instrument for measuring the flow of liquids and gases in pipelines. Variable area flowmeters generally have a flow range of 1. What is and how does a variable area flowmeter work.
Georg fischer however reserves the right to file actions in any court having jurisdiction over. These are simple and versatile devices which are used to measure the flow of liquids, gases, and steam. Overview of flowmeter models matheson offers a complete line of variable area flowmeters. It documents the error of each flow point relative to the stated tolerance limit. Variable area flow meters from lake monitors have recently undergone a production redesign. This flow meter is the most readable product in its class. George fischer however reserves the right to file actions in any court having.
Variable area basic fundamentals flowmeter and descriptions. Suitable limit switches see accessories for variable area flow meters. Bgn full metal variable area operating instructions instrumart. All the measurement tubes in this series of variable area flowmeters are made of either glass or plastic. Interested in more details in variable area flow measurement. If the mechanical, thermal or chemical resistance properties of the glass meter tube are not adequate.
It includes a vertical tube through which the fluid flows whose diameter increases from the bottom to the. The flow metering tube is transparent giving you full insight into the process and position of the float a scale on the outside of the tube indicates the true flow rate. Animations and real footage of variable area flow meters. Variable area flowmeter dfm 165 to 350 for all industrial uses practical graduated measuring ranges according to din, from 3 lh to 50000 lh. If adjustments to flow rates are required, a flowmeter equipped with a metering valve should be selected. Flowmeter with flow sensor ze 2000 new 3 60 600 100 1. Accessories 420 ma sensor for type 335 and type 350. The most important variable area flow metering practices. Variable area flow meters designed to provide economical, accurate flowrate indication for oil and water, many utilize a spring and piston type assembly, which enables them to be mounted in any position, and gives immunity to changes in viscosity. The basics of the measuring principle of variable area flowmeters in a few minutes.
For simple and accurate measurement of fluids and gases. Rotameter working principle animation instrumentationtools. Variable area flowmeters, g series and m series ms. Typical applications are water treatment, sealing water measurements and gas flow measurements.
A higher volumetric flow rate through a given area increases flow speed and drag force, so the float will be pushed upwards. Trust the expertise of the brooks instrument team for valuable insight on the right fluid flow meter for your needs. The float is pushed up by increasing fluid flow and pulled down by gravity as fluid flow decreases. The kytola model vlfh is flow meters, oil lubrication. The variablearea flowmeter consists of a device fitting with an integrated. Integration of optional flow switches, automated valves or alarms. Here youll find all of our meters that are offered in 1 size. Flow meters can be installed immediately adjacent to 90degree elbows or other components to provide greatest system design flexibility, while saving installation time and money. If the mechanical, thermal or corrosion properties of glass tubes are not adequate in certain applications, metal meter tubes can be used. Variable area flowmeters for visual or electrical flow. They are also widely used as simple flow regulators by adding a manual regulating valve integrated in the body of the flowmeter. Iz series variablearea flowmeter with metallic measuring tube is the variablearea flowmeter. The bgn meter is suitable for flow measurement of liquid or.