Flow measuring device an overview sciencedirect topics. In its simplest form, the device consists of a short converging section leading to a throat and followed by a diverging section. Also termed as inferential type of flow measuring devices. Flow measurement the continuous velocity and temperature measurement is very important when operating a system with gas flows for example indoor exhaust air, exhaust gases. There are different classification of flow measurement. Clean or dirty wet or dry hazardouscorrosive or safe single or multi phase laminar of turbulent varying. Pressure drop devices based on bernoulli principle a venturi b orifice plate c pitot tube 2. Flumes are openchannel flow segments built with contracted sidewalls andor raised bottoms.
Flume walls are vertical and the floor of the throat is inclined downward. Instrumentation is the art of measuring the value of some plant parameter, pressure. Industrial flow measurements include measuring of flow rate of solids, liquids and gases. Flow measuring technology for liquids, gases and steam products and services at a glance. Flow measurement methods other than positivedisplacement flowmeters rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Industrial flow measurement industrial flow measurement. In industrial work settings, the accurate measure of flow is highly critical. There are many different types of temperature measurement devices, each one tailored to meet a specific need. Head loss through parshall flumes is lower than for other types of openchannel flow measuring devices. Total flow meters, usually volume totalizers, are devices filled with a defined volume which is then. Different technologies types of flow meters proteus. Associate professor, mechanical and materials engineering department portland state university. Fluid flow devices fall into a number of device categories as well as fluid classes.
Pdf fluid flow measurement techniques researchgate. However, a variety of advanced equipment can also be used to sense stage and measure. Flow explain how devices generate a differential pressure signal. Information concerning the volume of available water is very helpful in planning for its future use and distribution.
Accurate flow measurement is very important for proper and equitable distribution of water among water users. Different types of temperature measuring devices june 30, 2018 june 30, 2018 admin 0 comments thermal engineering. The major advantages of orifice plate are that it is low cost device, simple in construction and. In general we can split the fluids into two classes. Advantages and disadvantages of different types of fluid. In a differential pressure drop device the flow is calculated by measuring the pressure drop over an obstructions inserted in the. The major advantages of orifice plate are that it is low cost device, simple in. Among the various types of flumes available as flow measuring devices summarized by us bureau of. Bennett abstract three techniques of boreholeflow measurement are particularly suitable for use. Several factors determine the pressure drop that occurs in fluid flow applications including laminar versus turbulent flow, the flow velocity, kinematic viscosity and reynolds number of.
Methods of flow measurement in well bores by eugene p. Four different types of flow meters has been present above with their advantages and disadvantages and according to those venture meter is the best choice for the flow meter as it has. Design details of a practical flowmeter installation. These protocols have been beneficial in drawing attention to the potential inaccuracy of blood pressure measuring systems, they permit comparison between devices and they have brought. Understand the basic principle of operation of an obstruction type flowmeter. Numerous practical details provide the user with valuable information about flow metering in industrial applications. The basic operating principle of differential pressure flowmeter is. An orifice flow meter is the most common head type flow measuring device. Flow measurement device in physiology, an instrument used for measuring the volume rate of blood flow in a blood vessel flowmeter or for measuring expired air flow pneumotachometer. Differential pressure flow instruments create a differential pressure in a fluid flowing through a pipe which can be measured. Flow meter is an instrument used for the measurement of the amount of liquid, gas or vapor that passes through them. Pressure drop in piping, measuring device small appreciable.
Selection and maintenance of temperature measurement. A common method of measuring flow through an open channel is to measure the height of the liquid as it passes over an obstruction as a flume or weir in the channel. Principles and methods of temperature measurement course content temperature can be measured via a diverse array of sensors. There are several types of flow measurement devices currently in use across. This fact sheet provides information on the types, use, and calibration of temperature measuring. A flow meter is a piece of equipment used to measure the flow rate of solids, liquids, or gases. These sensors are generally part of a flow meter that would help to measure the flow rate. Different types of flow elements or flow sensors are pitot tube, annubar flow element, orifice, venturi, flow nozzle and differential pressure flow sensors. Mechanical flow measurement devices enggcyclopedia. In some flow meter the flow is measured as the amount of fluid passing through the.
A venturimeter is a device meant for measuring the quantity of a liquid flowing through a pipe. Flow measurement device article about flow measurement. All of them infer temperature by sensing some change in a physical. There are any number of flow measurement devices for closed systems, based on differential head over an obstruction, moving fluid physical effects, or positive displacement. Our product finder helps you to search for suitable measuring devices, software or system components via product characteristics. Different types of flow measuring devices slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Obstructiontype flow meters me 322 lecture slides, winter 2007 gerald recktenwald. Flow measuring technology for liquids, gases and steam. There are different classification of flow measurement techniques for measuring the flow rate and total flow. There are other types of open channel devices, including magnetic, velocity head, and dilution types. Classification of flow measurement techniques types of. A flow meter is a device used to measure flow rate volumetric or mass or the quantity of fluids passing through a pipe. Flow meters can do this linearly, nonlinearly, volumetrically, or on a weight. Not only does this define profit or loss, but consumer and worker.