Compact ultrasonic flow meter s-flow - FSZ
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Retail price
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The non-intrusive ultrasonic flow meter for liquids optimizes your industrial processes and helps you save energy. Ultrasonic flow measurement technology reduces your costs and improves the safety of your installation. With its accurate flow measurement capability, this device offers a reliable solution for real-time monitoring and process optimization.
Download the brochure to find out how to accurately measure steam, air or liquid flow with ultrasonic flowmeters.

Fuji Electric's high-tech non-intrusive ultrasonic flowmeter has been developed for the precise measurement of liquid flow and velocity.
They are quick and easy to install on pipes of all materials and diameters.
This range of industrial flowmeters revolutionizes flow measurement and can be used over a wide range of temperatures and pressures.
Output signals transmit information to your control or monitoring systems.
The use of transit time technology contributes to the exceptional accuracy of this ultrasonic flowmeter, enabling flow measurement of liquids containing suspended particles or gas bubbles.



Fuji Electric ultrasonic flowmeters use the transit time difference method (different from the Doppler principle) to determine flow rates.
The two ultrasonic sensors are installed on the outside of the pipe.
Ultrasonic waves propagate diagonally across the cross-section from the upstream transducer to the downstream transducer, and then from the downstream transducer to the upstream transducer.
Unlike Doppler ultrasonic flowmeters, which measure the frequency of ultrasonic waves reflected by moving particles, transit time ultrasonic flowmeters operate differently. These flowmeters use the variation in wave propagation time. An ultrasonic wave is sent upstream and downstream of the fluid flow. In one case, the wave is "carried" by the fluid, in the other, it is "braked". It therefore takes a different time to travel from one ultrasonic transducer to the other.
This difference in transit time is proportional to the flow velocity. This method allows the fluid flow rate to be determined with a high degree of accuracy.
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Cost-effective and flexible
This measurement and control instrument lowers the cost of your projects by reducing installation and maintenance costs.
Quick and easy to install
Installation without drilling into the pipes requires no modifications, process shutdowns, or production interruptions. Your system can be installed in just a few minutes without interrupting the process.
Safety guaranteed
Since the line is not cut, there is no risk of product leakage.
Hygienic
You can be sure that your liquids won't be contaminated by debris, since the transducers are mounted outside the pipe.
Maintenance-free
Clamp-on sensors that do not come into contact with the fluid have no moving parts.
This product does not require calibration or cleaning.
High durability and robustness
The high-quality materials used ensure a long service life for your equipment.
The sensors and electronic converters feature an excellent protection rating.
High measurement accuracy and fast response time
High-performance 32-bit microprocessor electronics provide an accuracy of ±1% of your flow rates with a response time of no more than 1 second.
Long-term stability and insensitivity to changes in pressure, temperature, and fluid viscosity
Continuous calculation of the fluid's sonic velocity
Easy integration and installation into your systems
You get real-time display of flow rate, volume, and thermal energy.
The 4–20 mA analog output or pulse output from these flow meters ensures easy data transmission.
Modbus digital communication is also available for your industrial IoT solutions.
Excellent resistance to air bubbles
Exclusive ABM anti-bubble technology provides resistance to air bubble formation for optimal performance.


The non-intrusive clamp-on ultrasonic flowmeter offers numerous advantages. It is used in many industrial processes for monitoring and controlling processes and equipment.
This ultrasonic flowmeter is suitable for the continuous measurement of particle-free liquids inindustrial automation and energy audits.
Flow measurement is crucial for optimizing industrial processes and ensuring maximum efficiency.
Our measuring instruments perform reliably even in challenging applications.
The signal strength of the transducers automatically adjusts based on the condition of the pipe and the liquid being measured.
This allows you to measure with confidence, whatever your needs may be, even if your pipes are corroded.

We offer several versions and types of ultrasonic flowmeters, including single and dual sensor models, to help you choose the version best suited to your needs:
To meet your needs, we offer on-site commissioning services, including installation, configuration and staff training.
| Models | ![]() | ![]() | ![]() | ![]() | |
| Ultrasonic flowmeter for liquids FLR M-FLOW PW | Ultrasonic flowmeter for liquids FSV TIME DELTA-C | Ultrasonic flowmeter for liquids FSV-L TIME DELTA-C ETENDU | Portable ultrasonic flowmeter for liquids FSC | ||
| Mounting method | Non-intrusive | ||||
| APPLICATIONS | |||||
| Clean liquids without air bubbles or gas | ++ | ++ | ++ | ++ | |
| Waste water | + | + | + | + | |
| Viscous liquids | + | + | + | + | |
| Oils | + | + | + | + | |
| Corrosive liquids | ++ | ++ | ++ | ++ | |
| Non-conductive liquids | ++ | ++ | ++ | ++ | |
| Low flow rates | + | + | + | + | |
| Pulsed flows | (1) | (1) | (1) | (1) | |
| High temperature | + | + | + | + | |
| High pressure | ++ | ++ | ++ | ++ | |
| MAIN CHARACTERISTICS OF ULTRASONIC FLOWMETERS | |||||
| Protection | IP65 | IP66 (IP67 optional) | IP67 | IP64 | |
| Pipe diameter for flanged ultrasonic flowmeters | NA | NA | NA | NA | |
| Pipe diameter for non-intrusive ultrasonic flowmeter | ![]() FSSA Ultrasonic Sensor 25 to 225 mm (inner diameter) / -40 to +100°C | ||||
![]() FSSC Ultrasonic Sensor 50 to 1,200 mm (inner diameter) / -20 to +120°C | |||||
![]() FSSD Ultrasonic Sensor 13 to 300 mm (inner diameter) / -40 to +100°C | |||||
![]() FSSE Ultrasonic Sensor 200 to 6,000 mm (inner diameter) / -40 to +80°C | |||||
![]() FSSH Ultrasonic Sensor 50 to 400 mm (inner diameter) / -40 to +200°C | |||||
| Maximum pressure | No pressure limit | ||||
| Fluid temperature | Depending on the ultrasonic transducer used | ||||
| Flow velocity scale | 0 to ±0.3...10 m/s | 0 to ±0.3...32 m/s | |||
| Measurement accuracy | ±1.5 % | ±1.0% Depending on diameter and speed | |||
| Power supply | 100-240 Vac 50/60 Hz or 20-30 Vdc | 100-240 Vac 50/60 Hz | 12-hour battery 12 Vac or 100-240 Vac | ||
na: Not applicable
(1): Conditionally applicable
+: Applicable
++: Recommended
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