Pneumotachs and heated wire systems are flow sensing devices that are used to integrate flow into volume. These unique sensors are capable of detecting the smallest flow rates around the zero point of the respiratory flow and measuring flow rates of several hundred l/minute. Measuring liquid flow in channels is a unique challenge requiring specialized technology – and Siemens delivers. CORIOLIS MASS FLOW MEASURING PRINCIPLE. Primary Device. Define flow measurement. Flow meters are also known as Flow Gauges. For flow measurement purposed, a hydraulic structure is a fixed geometry device that is placed into the flow so that all of the flow is directed through or over the device. Here also the diameter is the same as that of the outlet pipe for an end connection for an outgoing flow. Selection and Maintenance of Temperature Measurement Devices (FS-25-W) 3.2.1.3 General calibration with certified reference thermometer 1. 18.6). Lecture 22: Flow measuring devices (Fig. 2. Measurement is the key principle and input for all these industries. Download Share Share. Within these two broad classes are a number of special classes that one should be careful of. Radar devices can only measure surface velocities, whereas laser-based devices can measure velocities sub-surface. If you continue browsing the site, you agree to the use of cookies on this website. Fluid flows up through the tapered tube and suspends a ‘float’ in the column of fluid. Accurate flow measurement is very important for proper and equitable distribution of water among water users. For each oscillation, a fixed amount of fluid passes through the piston casing. Ultrasonic gas flow meters from SICK quality that pays for itself. the actual flow-rate to the theoretical flow-rate through a device. A common device for flow measurement is the convergent-divergent nozzle or Venturi meter (Fig. Accurate flow measurement is very important for proper and equitable distribution of water among water users. 150053119009 Bhavesh Katariya. Integration is a process whereby flow (ie: volume per unit of time) at small intervals (time) is converted into volume and the volume Contracting the flow cross-section (narrowing the channel). Flow Measurement Weebly PPT. Clipping is a handy way to collect important slides you want to go back to later. 1.1 Types of flow measurement devices Fluid flow devices fall into a number of device categories as well as fluid classes. objective of our presentation In flow analyses based on similarity principles, these influences are accounted for by empirical coefficient CL or CT in the drag law for: The volume flow rate through the rotameter is: Where m is the open area ratio, defined as: And D is the tube diameter at the height of the bob. Industrial flow measurement Industrial flow measurement Basics and practice D184B075U02 Rev. You can change your ad preferences anytime. 30 Flow measurement 5.1.2 Measurement procedures using weirs To obtain a true measurement of the flow over weirs, certain dimensions must be respected because they are critical to correct operation. Get the plugin now. Flow measuring devices are generally classified into four groups. (Fig. Yule's River measurement techniques. As shown in the adjacent diagram, a gasket is used to seal the space between the Orifice Plate and the Flange surface, prevent leakage. Flow • explain how devices generate a differential pressure signal: orifice, venturi, flow nozzle, elbow, pitot tube, annubar; • explain how each of the following will affect the indicated flow signal from each of the above devices: change in process fluid temperature; change in process fluid pressure; and erosion. Obstruction or head type flowmeters are of two types: Differential Pressure Type Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Within these two Chapter 9 FLOW MEASUREMENT 241 Introduction, 241 Flow Principles, 241 Flow-Measuring Techniques, 252 Chapter 10 FINAL CONTROL ELEMENTS 275 Introduction, 275 Control Valve Basics, 275 AC and DC Motors, 292 Pumps, 302 Chapter 11 PROCESS CONTROL COMPUTERS 309 Introduction, 309 History of Process Control Computers, 309 Distributed Control Systems, 315 Now customize the name of a clipboard to store your clips. SITRANS L non-contacting ultrasonic level products provide continuous monitoring of wet wells, flumes, and weirs with reliable level-to-flow calculations. 22d) (C) Pitot tube: In such a device, part of the flow is made stagnant so that the entire KE of the fluid is converted into pressure–energy. ANEMOMETERS - View presentation slides online. With the "annubar", or multi-orifice pitot probe, the dynamic pressure can be measured across the velocity profile, and the annubar obtains an averaging effect. Our product finder helps you to search for suitable measuring devices, software or system components via product characteristics. See our Privacy Policy and User Agreement for details. Different Types of flow measuring devices. Actions. The Adobe Flash plugin is needed to view this content. SITRANS L non-contacting ultrasonic level products provide continuous monitoring of wet wells, flumes, and weirs with reliable level-to-flow calculations. 150053119008 Dharmajeet Jadeja If you continue browsing the site, you agree to the use of cookies on this website. Rotameters are extremely simple, robust devices that can measure flow rates of both liquids and gasses. Flow Measurement is the process of measuring fluid in your plant or industry. There is an inlet A small opening is made in the device, parallel to the flow, where the pressure is the same as the fluid pressure. The valve shall be of the bi-directional, blow-out resistant, tight shutoff, ball design, with position indicator, memory device, checked metering ports with drip caps and integral drain ports opposite the metering ports type. Here we measure the Pressure of the media at this discharge. The data obtained can be further used to compare against measurement obtained from the hydraulics bench. A laminar flow meter is a highly precise, differential pressure flow meter that uses the phenomenon of the Hagen-Poiseuille law, in which the pressure drop in a fluid in a laminar flow over a certain distance through a cylindrical pipe or between two flat plates is proportional to the volumetric flow rate. Friction pressure drop (packed screens) 3. Lecture 7 flow measurement youtube. Created by: Experiment (4): Flow measurement Introduction: The flow measuring apparatus is used to familiarize the students with typical methods of flow measurement of an incompressible fluid and, at the same time demonstrate applications of the Bernoulli's equation. Premonitions Truncating Purported. In almost every sector, different measurement devices are used. With the aid of microprocessor technology now discharge coefficient calculations can be done in real time. The flow measuring apparatus is used to familiarize the students with typical methods of flow measurement of an incompressible fluid and, at the same time demonstrate applications of the Bernoulli's equation. Types of Flow Measurement devices 18.6). Lecture Series on Industrial Automation and Control by Prof. S. Mukhopadhyay, Department of Electrical Engineering, IIT Kharagpur. Describe the importance of flow measurement. The use of the pitot tube is restricted to point measuring. Fluid Mechanics During a power outage, an operator turned off the pressure measurement devices. Dirty fluids can also be metered. Go to product finder; Go to Applicator Fixed restriction variable head type flow meters using different sensors like orifice plate, venturi tube, flow nozzle, pitot tube, dall tube, quan- If you continue browsing the site, you agree to the use of cookies on this website. A flow meter is a device that measures the flow rate of a fluid. The flow-measuring device, including flow measurement valves, should be positioned upstream of any associated valve and installed with a reasonable length of straight pipe upstream and downstream of the device. Learn more about Scribd Membership. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Flow Volume Measurements refers to systems that measure flow using a pneumotach or a heated wire system. This apparatus will allow students to compare between different types of flow measurement devices, namely by using a venturi device, orifice device and rotameter. OBJECTIVES After you study this chapter, you should be able to 1. Calculate the coefficient of discharge from experimental data for a venturi meter. Home. crude methods of flow measurement, but as you will see, these crude methods are still in use today. Each of these meters operates on the similar principle. Critical flow in open channels can be created by three means: 1. Another way to state this is to say that the accuracy of a weir or flume is quite high even at low flow … FLOW MEASURING DEVICES You can measure flow through a variety of different devices such as Coriolis, differential pressure, vortex, magnetic, ultrasonic, turbine and positive displacement meters, Flow Technology Advisor 1. Measuring Discharge with Acoustic Doppler Current Profilers from a Moving Boat contains the most current information and guidance regarding acoustic Doppler current profilers (ADCPs) used by the USGS at the time of publication. Steam filled the reactors and the high pressure caused the reactors and consequently the entire facility to explode. Achieve Precision Flow Measurement and Process Control Flow Measurement is the process of measuring fluid in your plant or industry. There is a lot of technical knowledge and expertise required in the development of these devices. measuring devices. Numerous practical details provide the user with valuable information about flow metering in industrial applications. Presentation Summary : In laminar flow, the fluid moves smoothly in orderly layers, with little or no mixing of the fluid across the flow stream. Explain the basic operation, list the advantages and disadvantages of each flow measurement device. The device is placed in a moving liquid with the lower opening directed in the upstream direction.  The In comparison to other flow measurement devices such as an orifice plate, the smooth contraction and expansion does not cause a significant pressure loss as fluid streamlines are able to conform to the geometry. Acoustic flow meters based on Doppler effect 5. Applicator leads you through an individual product selection via application parameters. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. The flow is determined using a sudden enlargement, venturi meter, orifice plate, elbow and a rotameter. Piston flow meter operates on the principle of a piston oscillating within a casing of known volume. Go to product finder; Go to Applicator Non-contact devices that use laser or radar are mounted above the channel and measure the velocity from above and then use ultrasound to measure the depth of the water from above. Determine the relationship between Reynolds number and the coefficient of discharge. Rotameters are extremely simple, robust devices that can measure flow rates of both liquids and gasses. Clipping is a handy way to collect important slides you want to go back to later. The operating principle of a Coriolis flow meter is basic but very effective. Storeroom's. Now customize the name of a clipboard to store your clips. Define flow Obstruction Flowmeter. You can change your ad preferences anytime. Integration is a process whereby flow (ie: volume per unit of time) at small intervals (time) is converted into volume and the volume from each interval is summed. From this experiment, we will obtain the flow rate measurement with comparison of pressure drop by utilizing three basic types of flow measuring techniques; ratometer, venture meter and orifice meter. Flow meters are flow measuring instruments used to measure the linear, nonlinear, mass, or volumetric flow rate of a gas or a liquid. In contrast to many other working principles, the pressure loss resulting from our consumption measurement method is negligible. Remove this presentation Flag as Inappropriate I Don't Like This I like this Remember as a Favorite. en Change Language. Quality measurement (m v/m) These techniques are for the most part all used in classical fluid flows. See our User Agreement and Privacy Policy. Because they are used for domestic water measurement, piston meters, also known as rotary piston or semi-positive displacement meters, are the most common flow measurement devices in the UK and are used for almost all meter sizes up to and including 40 mm ( 1 1 ⁄ 2 in). Raising the bottom of the channel; 2. Even more, properties of the fluid can be stored on the instrument and measuring temperature and absolute pressure allows to correct fluid parameters such as density and viscosity and then to obtain the mass flow rate. Two phase flows 1. Scribd is the world's largest social reading and publishing site. 1 C-8\N-IND\CH-5-1. Upload. This device involves the contraction of the fluid and subsequent expansion. A significant advantage that weirs and flumes have over other forms of flow measurement is exceptionally high rangeability: the ability to measure very wide ranges of flow with a modest pressure (height) span. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. A common device for flow measurement is the convergent-divergent nozzle or Venturi meter (Fig. Displaying flow measurement devices PowerPoint Presentations. Where a measuring accuracy of 5% is sufficient, these lengths should be a minimum of ten and three equivalent pipe diameters, respectively. Void fraction measurement (A v/A) a) Capacitance measurement b) Optical characterization 2. A primary device is used to measure open channel flow using a structure like a flume, weir or dam that enables the measurement of flow by measuring the depth. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Where a measuring accuracy of 5% is sufficient, these lengths should be a minimum of ten and three equivalent pipe diameters, respectively. Flow Measuring Devices. Laminar Flow Meters; Sonic Nozzles; Laminar Flow Meters. 3. FLOW MEASUREMENT CHAPTER 2 OBJECTIVES After you study this chapter, you should be able to 1. Our product finder helps you to search for suitable measuring devices, software or system components via product characteristics. See our User Agreement and Privacy Policy. The Pitot Tube: A pitot tube is a simple device meant for measuring the velocity of a liquid at any point. 22d) (C) Pitot tube: In such a device, part of the flow is made stagnant so that the entire KE of the fluid is converted into pressure–energy. An equation or rating curve equation can then be used to convert the measured depth to a flow rate. 7.72). The experiment is designed to study uniform water flow over a range of flow rates. These measurement devices have come ahead to revolutionize the measurement world. View Chapter 2 FLOW MEASUREMENT.ppt from CHEMICAL 434 at Universiti Teknologi Mara. Mechanical type flow meters. Meanwhile, the loss coefficient can be determined when fluid flows through a 90 elbow by measuring flow rate on manometers. Flow measuring devices ppt Flow measurement ppt | flow measurement | fluid dynamics. 2 INDUSTRIAL INSTRUMENTATION C-8\N-IND\BOOK1-1 They are : 1. 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