The ultrasonic waves strike particles moving through the sound field at velocity vp. Transducer types flow transducers fall into one of two major classes. Installation manual 39000760, rev ha may 2019 daniel 3814 liquid ultrasonic flow meter. An ultrasonic flow meter consists of power supplies, transducer excitation, signal conditioning, adcs, processing, a display, a keypad, and multiple communication options, such as 4 ma to 20 ma, hart, rs485, and wireless. Designed using our world class piezoelectric materials and expertise in transducer design and manu. The technical notes section is designed to provide a brief overview of the ultrasonic principles important to transducer application and design. Fluxus nonintrusive flow measurement with clampon ultrasonic technology. Flow sensors for ultrasonic metering ceramtec presents its ultrasonic flow sensors, ideal for use in ultrasonic metering of gas, water and submetering applications. Fundamentals of ultrasonic flow meters keven conrad and larry lynnworth panametrics, inc. Audiowell transducers use the transit time principal where opposite sending and receiving ultrasonic flow sensors are used to transmit signals through the flow. The ultrasonic flow meters and the accessories shall be suitable for continuous operation under an ambient temperature of 055c for transmitter and 20 to 100c for transducer and relative humidity of 095% unless specified otherwise in volume iib, sectiond or sectionc. Ultrasonic ranging module hc sr04 provides 2cm 400cm noncontact measurement function, the ranging accuracy can reach to 3mm.
To optimize every operation, siemens offers a comprehensive selection of inline ultrasonic and clampon ultrasonic flow sensors, transmitters and complete flow systems. Ultrasonic sensors for gas flow measurement these new ultrasonic sensors for gas flow measurement from ceramtec are intended to transmit and receive ultrasonic waves across a gas channel for time of flight measurement of gas flow. Clampon ultrasonic flow measurement and process analytics. A common use for angle beam transducers is in weld inspection, where a weld crown blocks access to the weld zone of interest for a standard contact transducer and where.
Ultrasonic measurement of gas flow using electrostatic. It applies to a transit time ultrasonic flow meter device. A requirement for reliable operation of a transittime ultrasonic flow meter is that the process fluid be free from gas bubbles or solid particles which might scatter or obstruct the sound waves. The fluid flow increases the ultrasonic signal time of flight in the direction of flow and decreases the time of flight against the direction of flow. Monitoring your processes with accurate flow measurement leads to higher transparency, improved productivity and a better bottom line. Introduction the cpt ultrasonic flow transducer is used exclusively with the ge line of ultrasonic flowmeters. These signals are emitted alternately in the flow direction and against it. Gas ultrasonic flow meter datasheet intelligence for custody transfer engineered for custody transfer applications, the daniel seniorsonic 3414 fourpath gas ultrasonic flow meter offers high accuracy and reliable, longterm performance to minimize lost and unaccounted for natural gas. We have a wide variety of models to choose from including easytoinstall clampon meters for liquids, micro flow sensors, portable doppler meters, wall mountable meters, inline meters, and more. Tds100 series ultrasonic flow meters ultrasonic heat meters ultrasonic industrial water meter use lowvoltage and multi pulse transit time principle, and. Since the early 2000s, ultrasonic clampon flow measurements, previously restricted mainly to liquids, were found effective in measuring in standard steel pipes. The flow meter includes an ultrasonic transducer, a wedge that has a sloped surface formed on a top portion of the wedge and oblique with respect to a downward direction, and a dented portion formed in a halfcylinder shape along a longitudinal direction of the sloped surface. This reference design features an ultrasonic flow transmitter that is able to measure water flow in the large pipes used in the process industry. When this measurement is completed, the transit time t21 of an ultrasonic signal traveling against the flow is measured from transducer 2 to transducer 1.
Cpt ultrasonic flow transducer installation guide 1 1. The most popular form of this utilises the principle known as either transit time or time of flight. Using 2 or 3 of these transducers, in applications such as smart metering of natural gas, can provide flow. Ultrasonic sensing basics for liquid level sensing, flow sensing, and fluid identification applications amyle abstract the need for accurate and reliable sensors is growing in so many markets around the world, such as industrial and manufacturing, automotive, medical, energy, and smart grid applications. These ultrasonic flow transducers measure the flow rate of sonicallyconductive liquids through pipes having diameters between 2 inches 5 cm and over 300 inches 7. Metflow transducers ultrasonic velocity profiling uvp. Ultrasonic sensing basics for liquid level sensing, flow. As transducers are key elements of the uvp measuring chain, we have been optimizing and refining their designs since our beginnings in the early nineties, thanks to a close and lasting partnership with a pioneer and expert in the field of ultrasound. Ultrasonic flow meter flow knowledge keyence america. Ultrasonic transducers measurements and horn design. Omega is a leading source for ultrasonic flow meters.
Met flow transducers are high quality products, custom designed for pulsed ultrasonic velocimetry with the latest technology available. Transit time flow meters ultrasonic waves are transmitted at an angle across fluid in the pipe. Ultrasonic transducers measurements and horn design youtube. Ultrasonic flow measurement flow measurement siemens. Ultrasonic ranging module hc sr04 product features. Flowcell transducer flow, longterm stability, hottapping installation, no need to shut down the flow a flowcell transducer, the zmethod is used. F4300 transit time ultrasonic flow meter 2 1 flow 1. The modules includes ultrasonic transmitters, receiver and control circuit. Pn 39000767 daniel model 3812 liquid ultrasonic flow meter maintenance and. Ge sensing panametrics ultrasonic flow transducers for liquids installation guide 916055b july 2007 ge panametrics has joined other ge hightechnology sensing businesses under a new namege sensing. In principle, the flow of a given liquid in a pipe is obtained by measuring the transit times.
The transit time of the signal traveling with the flow will be less than that of the signal traveling against the flow due. How to select and mount transducers in ultrasonic sensing for. My webpage on this proved to be reasonably popular, and i. More than 10 piezoelectric materials suitable for operation at. Pdf this article presents a new ultrasonic mass flow meter that has only two transducers. Industrial ultrasonic flow meter system design considerations and major challenges this solutions guide will focus on. Liability under this warranty is limited to restoring the instrument to normal operation or. How to select and mount transducers in ultrasonic sensing. It describes a software compensation technique used to overcome flow rate readings that might be inaccurate because of characteristic differences between measurement devices. Ultrasonic signals are emitted by a transducer installed on the pipe and received by a second transducer. Ultrasonic flow transducersensor audiowell international.
Each transducer transmits coded sound pulses received by the other transducer. Highquality ultrasonic transducers example for zero flow verification test results with narrow acceptance criteria manufacturing precision superior transducer technology zero flow verification test achieved spread path 1 steps to accuracy. There is provided a flow meter using at least one ultrasonic transducer. An enhanced technique for ultrasonic flow metering featuring. If the object is very close to the sensor, the signal comes back quickly if the object is far away from the sensor, the signal takes. Tis tdc handles ultrasonic tof measurements and can. Ge panametrics ultrasonic flow meter part ii transducer installation 3. By means of these two technologies and the internal, automatic compensation of varying ambient temperatures, flexim ensures maximum measuring accuracy and reliability, even under difficult conditions. How to select and mount transducers in ultrasonic sensing for level sensing and fluid id 1 transducer selection selecting the right transducer starts with understanding what and how you want to make your level sensing or fluid identification measurement.
The problems of development of hightemperature ultrasonic transducers for modern science and technology applications are analysed. Wetted transducers are inserted into the pipe so that they come in direct contact with the fluid being measured. Electroacoustic transducers receive and emit brief ultrasonic pulses through the liquid of the pipe. The meter is housed in a polycarbonate wallmounted enclosure with a builtin user interfacedisplay. Fdt21 series, ultrasonic flow meter browse online, omega. Flow is measured by changes in the transit time for the ultrasonic waves.
Easy and accurate flow measurement without interrupting the process clampon type sensor easily mountable on existing pipe suited for a wide range of liquids, for example, deionized water, cooling water, chemical solution, drinking water, sea water, oil, tap water, hot water, industrial water, corrosive liquids. Ge panametrics ultrasonic flow meter pacific gas and. The difference in transittimes is directly proportional to the flow. Panametrics crs ultrasonic flow transducers instrumart. View and download ge utx878 ultrasonic user manual online. With its quick and easy clampon transducer installation, factory preconfiguration and user programmable menu driven interface, the meter is a snap to. Transducers are vertically placed at both sides of the measured pipe. A transmitter that sends out a signal that humans cannot hear a receiver that receives the signal after it has bounced off nearby objects the sensor sends out its signal and determines how long the signal takes to come back. An additional type of flow meter technology uses an ultrasonic sensor. Fluxus clampon ultrasonic systems allow for the flow measurement of almost all liquid and gaseous media even those with increased inputs of solids and. Portable ultrasonic flowmeter for troubleshooting, calibration checks and balancing flow measures flow outsidefrom the of a pipe the 1. These transducers measure the flow rate of sonicallyconductive liquids through pipes having diameters between 2 in.
As the fluid in which the signals propaga te is flowing, the transit time of th e ultrasonic signals in the flow direc. This application note discusses how to get more accurate readings from ultrasonic transducers used in liquid and gas flow meters. Note that this is precisely the opposite requirement of doppler ultrasonic flow meters, which require bubbles or particles to reflect sound waves. Ultrasonic flow meters sensors and sensing equipment.
The transducer is the core element of the ultrasonic flow meters and level sensors. Flow meter application set up if the distance between the two transducers l is known, then by driving transducer 1 and monitoring the time it takes for transducer 2 to respond t1, then driving transducer 2 and monitoring the time for transducer 1 to respond t2, it is possible to calculate the flow rate v of the gas. Nonwetted transducers, commonly referred to as clampon transducers, are clamped onto the outside of the pipe and send their ultrasonic pulses. The ufm is a clampon, ultrasonic flowmeter that uses a multiple slope transit time algorithm to provide accurate flow measurements. Ultrasonic transittime flowmeter for permanent installation specifications. Panametrics ultrasonic flow transducers for liquids. Ultrasonic flow transmitter reference design texas instruments. Flow in the same direction takes less time to travel to the second transducer than does flow in the opposite direction. The mass flow is inferred from volumetric flow and. In this work, the suitability of broadband electrostatic.
Fm500 ultrasonic flow meters global water instrumentation. An emitter sends ultrasonic waves at frequency f1 approx. Oct 16, 2014 principle doppler flow meters operate similarly to the radar speed traps used on the road. How ultrasonic works for dual transducer measurement further information on how ultrasonic is used in fluid level sensing, fluid identification, flow metering, and distance sensing applications will be discussed in the next sections. The larger the difference between the upstream travel time versus the downstream, the more gas has passed through the meter. The transducers can be installed on a horizontal run of pipe or a vertical run of pipe with flow going up. Ultrasonic gas flowmeters typically use narrowband piezoelectric transducer arrangements for interrogating the flow of gas in a pipe. Avoid installing transducers on a vertical run of pipe with flow going down unless it is known that the pipe will always be full. Sonic ultrasonic gas flow meters 02 elster instromet theory of operation an ultrasonic flow meter takes advantage of the principle that an ultrasonic pulse travels faster with the gas flow than against the flow. The panametrics crs ultrasonic flow transducer is used exclusively with the panametrics line of ultrasonic flow meters. April 2004 iv warranty each instrument manufactured by ge panametrics is warranted to be free from defects in material and workmanship. Pdf introduction of a 2 transducer ultrasonic mass flow meter.