Ultrasonic Flow Measurement Solutions for Industrial, OEM and Project Applications
FlowT instrument manufactures ultrasonic flow meters for industrial flow measurement, equipment integration, system automation and project applications.
Built by flow measurement professionals with more than 20 years of industry experience, we provide a range of ultrasonic flow meters for different pipe sizes, installation conditions and measurement requirements.
Whether you need a standard ultrasonic flow meter, help selecting the right configuration, or an application-specific solution, our team can support you from product selection and configuration to testing, production and technical support.
FlowT Instrument (Shenzhen) Limited：Your Trustworthy Ultrasonic Flow Meter Manufacturer！
Our Company is established by flow measurement professionals with more than 20 years of experience in flow measurement and flow standards. We are pioneers in the ultrasonic flow measurement industry and possess many years of experience valuable to our customers. Furthermore, We are innovative and on the cutting edge of ultrasonic technology with some revolutionary measurement techniques being introduced that will bring very high precision and true real time measurement.
Leading Service
We are committed to constantly innovating our products to provide foreign customers with a large number of high-quality products to exceed customer satisfaction. We can also provide customized services according to customers' requirements such as size, color, appearance, etc. We can provide the most favorable price and high-quality products.
Quality Guaranteed
We have been continuously researching and innovating to meet the needs of different customers. At the same time, we always adhere to strict quality control to ensure that the quality of every product meets international standards.
Wide Sales Countries
Our products have been exported to more than 40 countries, such as Russia, Australia, USA, UK, Germany, Ukraine, Iran, Romania, Hungary, Mexico, Brazil, Chile, Canada, Spain, Colombia, etc. We have agents in the USA, Australia, Singapore, Kuwait, Russia.
Various Types of Products
Our products include a wide range of flow meter like Ultrasonic Flow Meter，Electromagnetic Flow Meter, Vortex Flow Meter, Thermal Mass Flow Meter, Turbine Flow Meter, Liquid Level Flow Meter, Gear Flow Meter, Totalizer Flow Meter and so on.
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![Dual sensor handheld ultrasonic flow meter]()
Dual sensor handheld ultrasonic flow meterThe Flowmeter Ultrasonic Portable is a state-of-the-art device that offers precise measurement of flow rates in a variety of applications. Its portable design makes it easy to transport and use in -
![New metal shell ultrasonic flowmeter]()
New metal shell ultrasonic flowmeterThe FT201 Turbo is a wall-mounted, clamp-on ultrasonic flowmeter that utilizes transit time technology. It features an FPGA chip design and employs low-voltage, broadband pulse transmission -
![Two-channel Ultrasonic Flowmeter]()
Two-channel Ultrasonic FlowmeterT102 is a premier ultrasonic flowmeter for flexibility and permanent installation. The dual-channel design allows the user to install two pairs of transducers on a single pipe for locations -
![Small Diameter Ultrasonic Flowmeter]()
Small Diameter Ultrasonic FlowmeterThe FT311 ultrasonic flow meter is a clamp-on type solution for small pipe size applications. This innovative device does not require the measured liquid to be conductive, making it suitable for a -
![Low Flow Digital Micro Mini Ultrasonic Flow Meter]()
Low Flow Digital Micro Mini Ultrasonic Flow MeterThe Low Flow Digital Micro Mini Ultrasonic Flow Meter is incredibly easy to use, with a user-friendly interface and simple installation process. This makes it accessible to a wide range of users, -
![Strap on Water Ultrasonic Flow Meter High Accuracy for Building Automation HVAC]()
Strap on Water Ultrasonic Flow Meter High Accuracy for Building Automation HVACStrap on ultrasonic flow meter high accuracy for building automation HVAC Ultrasonic flow meter because it unique technical so it could use just clamp on the pipe, so it’s perfect use in the building -
![Ultrasonic Liquid Flow Meter Specially Designed For Water]()
Ultrasonic Liquid Flow Meter Specially Designed For WaterFT201 is a transit time ultrasonic flow meter specially for water. It is designed using FPGA chip and low-voltage broadband pulse transmission. Both Clamp on type sensors and Insertion type sensors -
![Non Intrusive Flow Meter]()
Non Intrusive Flow MeterIn modern industrial processes, accurately measuring the flow of liquids and gases is crucial for ensuring production efficiency and safety. Non-intrusive ultrasonic flow meters, as advanced -
![Non-intrusive Portable Ultrasonic Flowmeter]()
Non-intrusive Portable Ultrasonic FlowmeterThe FT221 Portable Ultrasonic flow meter is a cutting-edge device that uses acoustic vibrations to accurately measure the flow rate of liquids. This non-intrusive flow sensor is perfect for automated -
![Fluid Flow Meter]()
Fluid Flow MeterIntricately designed devices tasked with gauging the velocity of fluids—be it liquid, gas, or vapor—as they traverse through a channel or piping. These instruments are critical for monitoring fluid -
![Flowmeter Ultrasonic Portable]()
Flowmeter Ultrasonic PortableThis portable ultrasonic flow meter consists of two clamp on transducers (install on the closed pipe) and of a digital converter operating on internal battery or on a power source. This non-invasive -
![Clamp-On Ultrasonic Water Flow Meter]()
Clamp-On Ultrasonic Water Flow MeterUltrasonic clamp-on flowmeters measure fluid flow in main applications. By using sound waves to determine the transit time of a gas or liquid, ultrasonic flowmeters can accurately monitor any changes
Why Choose FlowT as Your Ultrasonic Flow Meter Manufacturer?
Buying a flow meter for an industrial project is not only about selecting a model from a catalog. Pipe conditions, fluid properties, installation space, required outputs, communication interfaces and system requirements can all affect the final configuration.
FlowT combines ultrasonic flow measurement experience with product selection, manufacturing and technical support to help customers identify a suitable solution for their application.
Flow Measurement Experience
Our team is built around professionals with extensive experience in flow measurement and flow standards. This experience helps us evaluate applications beyond basic pipe diameter and flow range.
Multiple Ultrasonic Flow Meter Options
Our ultrasonic flow meter range includes portable, handheld, wall-mounted, clamp-on, dual-channel and application-specific configurations for different measurement requirements.
Manufacturing & Configuration Support
Products can be assembled and configured according to the selected model and order requirements, followed by functional inspection and testing before shipment.
Custom & OEM/ODM Support
For customers requiring more than a standard product, project-specific configuration, private labeling and other OEM/ODM requirements can be evaluated according to the application and order.
Technical Support
We help customers evaluate pipe size, fluid, temperature, installation conditions, signal output and other important parameters when selecting an ultrasonic flow meter.
Global Supply Experience
FlowT products are supplied to customers in more than 40 countries, supporting distributors, equipment manufacturers, system integrators and industrial users in different markets.
Ultrasonic Flow Meters for Different Industrial Applications
Different applications require different installation methods, measurement ranges and system configurations. FlowT offers multiple ultrasonic flow meter configurations so customers can select a product according to the actual operating conditions.
Clamp-On Ultrasonic Flow Meter
Non-invasive flow measurement without cutting the pipe. Clamp-on transducers are installed on the external pipe surface, making this configuration suitable for applications where process interruption should be minimized.
Best for: Existing pipelines, HVAC, water systems, process monitoring and retrofit projects.
Portable & Handheld Ultrasonic Flow Meter
Designed for temporary measurement, flow verification, maintenance inspection and multi-point measurement.
Best for: Commissioning, troubleshooting, energy audits, temporary testing and field measurement.
Wall-Mounted Ultrasonic Flow Meter
Suitable for fixed installation and continuous flow monitoring in industrial and building automation systems.
Best for: Permanent monitoring, water systems, HVAC, industrial processes and automation applications.
Dual-Channel Ultrasonic Flow Meter
Dual-channel configurations can support applications requiring multiple transducer pairs or more flexible measurement arrangements.
Best for: More demanding permanent installations and multi-channel measurement requirements.
Custom Ultrasonic Flow Meter Solutions
Standard Product When Possible. Application-Specific Configuration When Needed.
A standard ultrasonic flow meter is often the fastest and most economical solution. However, not every application has the same pipe conditions, installation space, temperature range, signal requirements or control system.
FlowT can evaluate application-specific requirements and recommend a standard configuration or a customized solution where appropriate.
What Can Be Customized?
Customization options depend on the selected product model, application requirements, order quantity, and technical feasibility.
01
Measurement Configuration
Measurement parameters can be configured according to the actual operating conditions and flow measurement requirements.
- Pipe diameter and size range
- Expected flow range
- Fluid type and temperature
- Measurement and channel requirements
02
Transducer Configuration
Transducer selection can be adapted to different pipe sizes, installation methods, and operating conditions.
- Clamp-on or insertion transducers
- Different transducer sizes
- Pipe size range selection
- Temperature and installation requirements
03
Signal Output
Output configurations can be selected according to the customer's monitoring, automation, and control requirements.
- 4–20 mA output
- Analog or digital output
- Pulse output
- Relay functions
04
Communication
Communication options can be configured to support integration with industrial control and monitoring systems.
- RS485 communication
- Modbus communication
- Digital communication interfaces
- Communication parameter settings
01
Power Supply
Power configurations can be selected according to the installation environment and operating requirements.
- AC or DC power options
- Voltage requirements
- Portable power configurations
- Application-specific power arrangements
02
Cable & Connector
Cable and connection configurations can be adapted for equipment integration and different installation environments.
- Sensor cable length
- Cable routing requirements
- Connector configuration
- Equipment integration requirements
03
Display & Parameter Configuration
Display and operating parameters can be configured according to the selected product platform and application.
- Display configuration
- Measurement parameter settings
- Output parameter settings
- Communication parameter settings
04
Branding & Documentation
For qualifying OEM orders, product identification, branding, documentation, and packaging can be customized.
- Customer logo and nameplate
- Product label and model identification
- User manual and datasheet
- Packaging and product documentation
Ultrasonic Flow Meter Testing, Calibration & Accuracy Verification
Measurement Performance Must Be Verified, Not Simply Claimed
For industrial customers, the most important question is not only whether an instrument powers on, but whether the completed configuration performs correctly for its intended measurement function.
FlowT configures and tests products according to the applicable product and order requirements before shipment.
Where calibration or additional measurement verification is required, the scope should be confirmed according to the selected model and project.
Functional Verification
Applicable checks can include:
Transducer signal
Display operation
Parameter settings
Analog/digital output
Communication
Measurement response
low Measurement Verification
Where applicable, flow measurement performance can be evaluated using the appropriate test or calibration process for the selected product.
Documentation
Depending on the product and agreed project scope, customers may request available inspection, test or calibration-related documentation.
What is an Ultrasonic Flow Meter?
An ultrasonic flowmeter is a device used for measuring the flow rate of liquids and gases with ultrasound technology. It operates on the principle of measuring the time taken for ultrasonic waves to travel through the fluid from one transducer to another. The flow rate of the fluid is then calculated based on the known distance between the transducers and the measured time delay. Ultrasonic flowmeters consist of two transducers, one acting as a sender and the other as a receiver. The sender sends out high frequency sound waves into the fluid, and the receiver detects the waves after they have travelled through the fluid. The time taken for the waves to travel from the sender to the receiver is then used to calculate the flow rate of the fluid.
Benefits of Ultrasonic Flow Meter
A cost-effective solution
The price of an ultrasonic flow meter does not depend on the size of the pipes. It is a pair of probes simply fastened to the outside of the pipe. They therefore require no work, no maintenance, no interruption of production and no pressure drop. An ideal solution for measuring flow at low cost! Several versions are available depending on the type of application and operating frequency.
Quick and easy installation
The external or clamp on system of an ultrasonic flow meter allows installation in less than half an hour! There is no need to interrupt the process or cut and/or weld the pipe. It can be adapted to all pipes, regardless of their diameter and material.
Reliable and accurate liquid flow measurement
Unaffected by pressure or temperature conditions, ultrasonic flowmeters provide extremely precise measurements, whatever the type of fluid that accepts the propagation of ultrasonic waves: water metering, wastewater, cooling water, beverages, oil and various chemicals, alcohols, etc.
On non-conductive liquids
Ultrasonic flow meters have the advantage of being able to measure non-conductive fluids (pure water, condensate, hydrocarbons...), which is not possible with an electromagnetic flow meter.
In harsh environments
Even when installed in harsh conditions, such as on oil and gas equipment, ultrasonic flow meters remain reliable and accurate. With self-tuning signal strength capabilities, you can confidently measure liquid in existing or old pipes with ease. Some ultrasonic flow meters, such as those from Fuji Electric, even feature anti-bubble technology to meet your needs and guarantee accurate results, no matter the environment. This makes them highly effective flow measurement instruments for many industrial processes. Thanks to their non-intrusive installation, they can monitor and control equipment without disrupting operations - an ideal solution for measuring particle-free liquids in automated systems or forenergy efficiency audits.
100% hygienic, non-invasive flow meters
With no contact with the environment, there is no risk of contaminating your products or fluids. Unlike electromagnetic flow meters, the transducers of ultrasonic flow meters are mounted outside the pipe. This means that no particles or debris can infect the liquids. They are ideal for use in the food, pharmaceutical and cosmetic industries to prevent process contamination.
No moving parts
Traditional mechanical flowmeters measure pressure through the use of moving parts, which serve as mechanical sensors. Unfortunately, these parts pose several problems. They often obstruct flow and cause pressure loss. The moving parts also degrade over time, providing less accurate results and requiring repair and replacement. Since there are no moving parts in ultrasonic flowmeters, you don’t have to worry about them degrading or creating a blockage.
Low maintenance
Since ultrasonic flowmeters don’t involve moving parts, they last a long time with very little maintenance. They also have low power consumption, so they often last for several years before the batteries need to be replaced.
Digital and analog options
Ultrasonic flowmeters come in a wide range of outputs, and advanced technology has allowed for the creation of ultrasonic transducers with digital readouts and network connection capabilities. This means that transducers can communicate measurements in real time to a central monitoring system.
High accuracy
As long as the meter is properly mounted and installed, these meters are highly accurate. However, inline and insertion flowmeters are generally more accurate than clamp-on ultrasonic flowmeters.
Working Principle of Ultrasonic Flow Meter
The basic principle of operation employs the frequency shift (Doppler Effect) of an ultrasonic signal when it is reflected by suspended particles or gas bubbles (discontinuities) in motion. This metering technique utilizes the physical phenomenon of a sound wave that changes frequency when it is reflected by moving discontinuities in a flowing liquid. Ultrasonic sound is transmitted into a pipe with flowing liquids, and the discontinuities reflect the ultrasonic wave with a slightly different frequency that is directly proportional to the rate of flow of the liquid. Current technology requires that the liquid contains at least 100 parts per million (PPM) of 100 micron or larger suspended particles or bubbles.
The Doppler ultrasonic flow meter operates on the principle of the Doppler Effect, which is the physical phenomenon of a sound wave changing frequency. In the case of ultrasonic flow meters, the frequency of an ultrasonic signal changes (Doppler Effect) in direct proportion to the rate of flow of the liquid when reflected by suspended particles or gas bubbles (discontinuities) in motion.
Typically, an ultrasonic Doppler flow meter consists of a transmitter/indicator/totalizer and a transducer. The user selects a configuration appropriate to the application – taking into account the liquid, the size and concentration of solids or bubbles, the pipe dimensions and the pipe lining. The transmitter’s signal threshold usually adjusts to filter out mechanical and electrical noise.
A high-frequency oscillator in the transmitter drives the transducer, which, in the popular clamp-on design, mounts on the pipe exterior. The transducer generates an ultrasonic signal that passes through the pipe wall into the flowing liquid; the transmitter converts the difference between its output and input frequencies to electronic pulses. Processed, scaled, and totalized, the pulses provide a measurement of flow.
Ultrasonic Doppler flowmeters that clamp onto the outside of a pipe operate non-invasively, without moving parts. They cause no pressure drop, risk no damage from the process liquid, and entail little maintenance. If properly calibrated, they can have ±1% accuracy – however, the pipe wall and any air space between the wall and the liquid can generate signal interference. Moreover, a stainless-steel pipe wall might conduct the transmitted signal to the extent that the reflected signal will seem to undergo a major shift.
Transit time ultrasonic flow meters measure the time difference between when an ultrasonic signal is transmitted from the first transducer until it is received by the second transducer. A differential comparison is made of upstream and downstream measurements. If there is no flow, the travel time will be the same in both directions. When flow is present, sound moves faster if traveling in the same direction and slower if moving against it.
A third ultrasonic flow meter employs cross-correlation between upstream and downstream transducer pairs to compute flow. Some flow meters of this design use microprocessors to switch automatically between “clean” and “dirty” modes based on correlation factors. A single cross-correlation hybrid flowmeter could, for example, monitor flow of either activated or digested sludge. Carefully engineered applications using such flow meters have had reported installed accuracy within 0.5% of reading.
Installation Of Ultrasonic Flow Meter
Installation location selection
(a) Select a suitable installation location according to the measurement requirements. Avoid factors that affect measurement accuracy, such as locations with low liquid flow rates, near strong vibration sources, and pipe bends.
(b) Ensure that the installation location is easy to maintain and service, and convenient for operation and inspection of sensors and other components.
Correctly install the sensor
(a) Follow the installation guide provided by the manufacturer to ensure the correct installation direction and distance requirements of the sensor.
(b) Before installation, clean the inside of the pipe to ensure that there are no impurities and sediments that affect the accuracy of the measurement.
(c) Use appropriate sealing materials and fasteners to ensure the tightness and firmness of the sensor and pipe interface.
Cable wiring and connection
(a) Use cables that meet the requirements for wiring to prevent interference and signal loss.
(b) Keep the cable away from other electrical equipment, high-voltage lines, etc. to avoid mutual interference.
(c) Ensure that the cable connection is firm and reliable to avoid measurement errors caused by loose cable connections.
Verification and debugging
(a) Perform preliminary verification and debugging after installation to check whether the measurement results are normal and eliminate possible problems.
(b) Perform corresponding parameter settings and system configuration according to the operating manual provided by the manufacturer to ensure that the flow meter works properly.
How to Maintain Ultrasonic Flow Meter
Cleaning
(a) Regularly check the sensor and pipes for impurities, dirt, blockage, etc., and clean them. Use a soft cloth or brush to remove attachments, and avoid using chemical solvents to avoid damage to the sensor.
(b) Check whether the sensor is firmly fixed. If it is loose, tighten the screws in time.
(c) Clean the display and buttons to prevent dust, oil and other substances from affecting operation and observation.
Regular Calibration
(a) Perform calibration operations regularly according to the manufacturer’s recommendations to ensure the accuracy of the flow meter. Generally, calibration can be performed through the system’s own calibration function or by professional technicians.
(b) Temperature calibration: Some ultrasonic flow meters require temperature calibration to ensure accurate temperature measurement.
Inspection and Maintenance
(a) Regularly check whether the ultrasonic sensor is intact, especially the sensing panel and probe.
(b) Check whether the cable connection is good to eliminate measurement errors caused by connection problems.
(c) If a fault or abnormality is found, contact the supplier or maintenance personnel in time for repair or replacement of parts.
Maintain a suitable working environment
(a) Avoid exposure to extreme temperatures, humidity or corrosive gases to avoid affecting the performance and life of the flow meter.
(b) Avoid physical shock and vibration to prevent damage to mechanical parts.
(c) Regularly check the power supply and grounding system to ensure stable power supply and good grounding.
How to Choose Ultrasonic Flow Meter
Medium - One of the key considerations when selecting an ultrasonic flow meter is the medium that will be measured. Water is the easiest and least expensive to measure. This includes chilled water, medium temperature hot water, and domestic water flow. If you are measuring anything with solids mixed in such as wastewater or a slurry, it becomes more difficult to measure flow. Some process chemicals and gasses are also quite complicated to measure. If you are measuring any of these more difficult mediums then it will likely require a more sophisticated ultrasonic flow meter.
Temperature - Temperature plays a huge role in selecting an ultrasonic flow meter. In general, anything in a “normal” temperature range is easier. Once the temperature goes above 250 degrees fahrenheit the application requires something more advanced. The same is true for extremely cold mediums such as liquid nitrogen.
Pipe Type - When it comes to pipe type, stainless steel, copper, and carbon steel pipes are pretty easy for ultrasonic flow meters. On the other hand, pipes made of ductile iron or anything with a liner such as asbestos cement are considerably more difficult. Likewise pipes with thicker walls can pose more of a challenge for lower end ultrasonic meters.
Pipe Size - In general, ultrasonic flow meters can handle anything from .5 inch to 256 inches in diameter. However, something to keep in mind is that they will not work if the pipe is not full of the medium.
Pipe Run - Pipe run refers to the length of pipe you have available to install the ultrasonic flow meter. Longer runs are easier, so if you have a shorter pipe run it can be done, but will require a higher end flow meter.
Needed Accuracy - Another consideration is the needed accuracy for the application. If you are just verifying flow or making sure you have flow, use of a less advanced meter may be the best choice. However, if you are using the flow data for billing purposes or to control a batching process, you will want to make sure that the data is very accurate and should invest in a better quality meter.
Signal Output - Do you need a simple 4/20 ma output or do you need a digital output that will feed data into your facility’s control system? If you are doing more with your data, you will need to plan to spend more for a meter that can communicate with your controls.
Configuration - Are you collecting measurement from a single point or are you looking for a dual channel output with multiple sets of transducers? As you might imagine, a single point measurement system is considerably less expensive than one with multiple sets of transducers.
FAQ
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