For liquids, ultrasonic flow meters work best with a less than 10% by volume content of suspended solids or air gaps. When choosing flow meters, one should consider such intangible factors as familiarity of. How do flow meters work flowmeter types and operation. Common types of differentialpressure flow meters are the orifice, the pitot tube, and the venturi tube. Flow meters can do this linearly, nonlinearly, volumetrically, or on a weight basis. A flow meter is a device used to measure flow rate volumetric or mass or the quantity of fluids passing through a pipe. Water metering is the practice of measuring water use. When choosing flowmeters, one should consider such.
Flow meters are devices that are used to measure the flow rate of a certain liquid or gas. Ultrasonic flow meter flow knowledge keyence america. Difference between different types of flow meters x important factors in flow measurement flow measurement viscosity viscosity is defined as the quantitative measure of tendency of a fluid to resist the forces of shear or deformation. Flow measurement is the quantification of bulk fluid movement.
Each method has its own specific characteristics which are directed toward individual installation requirements. The different sensors include dial, inline, ultrasonic, orifice plate, totalizing meters, variable area, venturi, or with switch output. The specific application defines the type and capacity of the flow meter. Used for measuring a wide variety of liquids and gases in most industrial and municipal facilities. A flow meter is used in different types of applications to measure the volumetric flowrate or mass flowrate. It is also a common practice to use a clampon ultrasonic flow meter to verify other flow meters or for. A flying lead pickoff with smooth body are used on flow meters that do have the 1 mnpt nipple. Flow knowledge is a website that contains a wealth of information on flow meters and flow sensors. These meters are designed to keep track of how much water is consumed by a particular household or. Clean or dirty wet or dry hazardouscorrosive or safe single or multi phase laminar of turbulent varying.
Introduces flow meter types and principles explains ultrasonic flow meters. Types of variable area flowmeters rotameters buck sales. Scribd is the worlds largest social reading and publishing site. When choosing flowmeters, one should consider such intangible factors as familiarity of plant personnel, their experience with calibration and maintenance, spare parts availability, and mean time between failure history, etc. This article will provide the following information in short.
Flow meters with threaded end con nections typically do not have the 1 nipple. Fluid characteristics single or double phase, viscosity, turbidity, etc. A flow meter is an instrument used to measure linear, nonlinear, mass or volumetric flow rate of a liquid or a gas. What are the different types of mechanical flow meters. Ultrasonic flow meters, using the ultrasonic principle, measure the velocity of flow. Classification of flow measurement techniques there are various different methods for measuring the flow rate and the total flow. The third type of mass flow technology is the multi var iable dp flow meter which measures temperature and pressure a s well as flow. The rotational speed of the rotor is proportional to the. We can use a different type of ultrasonic flow meters, like portable ultrasonic flow meter, handheld ultrasonic. Fluids, gases and liquids, are measured in terms of volumetric flowrate and mass flowrate. Water meters measure the volume of water used by residential and commercial building units that are supplied with water by a public water supply.
Turbine flow meters use the mechanical energy of the liquid or gas to rotate a rotor in the flow stream. Various types of flow meters and flow sensors are available, and only by selecting the appropriate device according to the targeted fluid and purpose will the required results be obtainable. As well as a greater understanding of the specifications of the manufactured pulse output signal for the coriolis mass flow meters cmfms and liquid ultrasonic flow meters. From singleuse to magnetic to variablearea to coriolis, the options in flowmeters. In industrial work settings, the accurate measure of flow is highly critical. In any production control system it is crucial to know the quantity of fluid that is actively involved in the process and this is where the flow meters needs to be able to accurately. Flow sensors are devices which are used to measure a flow rate of fluid. Flow meter is an instrument used for the measurement of the amount of liquid, gas or vapor that passes through them. Flow meter performance, validation and compliance to 40. Ultrasonic flow measurementdifferent types of ultrasonic.
The primary disadvantage of the orifice type flow meter is that there is a significant. Obstruction or head type flowmeters are of two types. Fluid flow measurement can encompass a wide variety of fluids and. Flowmeters are classed as volumetric or inferential, the latter term referring to meters that determine velocity from other variables such as pressure differences across a device such as an orifice plate. In some flow meter the flow is measured as the amount of fluid passing through the. Fixed restriction variable head type flow meters using different sensors like orifice plate, venturi tube, flow nozzle, pitot tube, dall tube, quan tity meters like positive. Industrial flow metersflow transmitters introduction flow meters are an integral tool for measuring the flow of liquid, gas, or a mixture of both in applications used in the food and beverage industry, oil and. Variable area variablearea flow meters have an internal float or orifice plate that moves in. An introduction to different types of fluid flowmeters orifices, venturies, nozzles, rotameters, pitot tubes, calorimetrics, turbine, vortex, electromagnetic. The following energy types exist in a flowing liquid or gaseous. How to select a flow meter flow knowledge keyence america.
There are working principles of all sorts to measure gas or liquid. Orifice meter, venturimeter, pitot tube fall under the first. Flow meters with flanged end connections typically do have the 1 nipple. The only flow meter technology that measures volume directly is the positive displacement flow meter, however, other types of flow meters measure the velocity of the flowing stream to determine the. Different technologies types of flow meters proteus. It is necessary to analyze the facts in the specific situation to find the best option. Pressure drop devices based on bernoulli principle a venturi b orifice plate c pitot tube 2. When there is mass flow, there is some twisting of the tubes. It lives in the realm of variable area flow meters. Types of flow meters free download as powerpoint presentation. Utube manometer the inclined and vertical utube manometers are inexpensive and common in the differential pressure measurement with flow meters like pitot tubes, orifices and nozzles.
Types of flowmetersprinciple of operationfeatures of flowmetersadvantages and disadvantagesselection application of a flowmeter types of flowmeters volumetric flowmeters differential head type orifice platesventuri metersannubar differential area type rotameters. A flow meter is a piece of equipment used to measure the flow rate of solids, liquids, or gases. Pitot tubes the pitot tube are one the most used and cheapest ways to measure fluid flow, especially in air applications like ventilation and hvac systems, even used in airplanes for speed measurent. These sensors are generally part of a flow meter that would help to measure the flow rate. An orifice flow meter figure 1 is used to create a constriction.
Types of flow meters are divided into two functional groups. In a velocity flowmeter the flow is calculated by measuring the speed in one or more points in the flow, and integrating the flow speed over the flow area. A flow meter or flow sensor is an instrument used to measure linear, nonlinear, mass or volumetric flow rate of a liquid or a gas. Monitors natural gas flows into ovens and furnaces, cooling fluids to. Which type of flow meter for your process application. Not only does this define profit or loss, but consumer and worker. Flowmeters are used to measure the flow in a piping system. The arm through which fluid flows away from the axis of rotation. Ultrasonic flow meters have many applications, from process flow to custody flow. Pdf fluid flow measurement techniques researchgate. A positive displacement meter is a type of flow meter that requires fluid to mechanically displace components in the meter in order for flow measurement. Water meters are found in residential and commercial buildings that use a public water supply system. Industrial flow metersflow transmitters texas instruments. The common types of flowmeters with industrial applications are listed below.