Ultrasonic flow meter for liquids

Non-intrusive ultrasonic liquid flow meters optimize your industrial processes and save energy. Ultrasonic flow measurement technology reduces your costs and improves the safety of your installation.

Benefits of the non-intrusive flow meter

Fuji Electric's high technology non-intrusive ultrasonic flow meters have been developed for high accuracy measurement of liquid flow and velocity. These flow meters are quick and easy to install on pipes of all materials and diameters. These industrial measuring instruments can be used to measure the flow rate over a wide temperature range regardless of pressure. The output signals transmit the information to your control or monitoring systems.

the benefits of a non-intrusive flow meter

Technical Features

  1. No pipe cut-off
  2. No pressure drop
  3. No contact with the liquid
  4. No risk of leakage
  5. No risk of contamination of the fluid

What is the operating principle of ultrasonic flow meters for liquid ?

The Fuji Electric ultrasonic flow meter uses the transit time difference method to measure the velocity of a fluid.

how an ultrasonic liquid flow meter works

Two transducers working at high frequency are installed outside the pipe.

The ultrasonic wave propagates into a stream of flowing liquid through the pipe wall over the cross sectional area in the diagonal of the pipe from the upstream transducer to the downstream transducer, and then from the downstream ultrasound transducer to the upstream second transducer.

In one case, the ultrasonic pulses are "carried" by the fluid in the same direction, and the reflected signal beam is "slowed down" in the against direction.

It, therefore, the ultrasonic signal takes a different time to pass from one ultrasonic sensor to the other. This instrument operate by alternately transmitting and receiving the sound waves at modulated frequency.

This difference of sound wave corresponding to the transit time or travel time is directly proportional to the flow velocity and the fluid flow rate measurement. The acoustic properties of each liquid are different and must be set in the parameters of the ultrasonic flow meter to insure high accuracy.

What are the advantages of a Fuji Electric ultrasonic flow meter?

average signal value schematic

What are the applications of ultrasonic flow meters?

The non-intrusive ultrasonic clamp-on flowmeter has many advantages.
It is used in industrial processes for monitoring and control of processes and equipment.
These ultrasonic meters are suitable for the measurement of the velocity of a fluid on non-particulate liquids in industrial automation and for energy audits.

what are the applications of ultrasonic flow measurement?

  • Drinking water supply and wastewater treatment plants: search for leaks and the direction of fluid flow on piping in service
  • Thermal power plants or electric power plants: boilers, condensate circulation pumps and turbine oils
  • Building heating and air conditioning: hot and cold water for heating and air conditioning HVAC
  • Thermal spas and swimming pools: quantities of water drawn
  • Automotive industry : paint flow measurement
  • Food and pharmaceutical industries: raw materials (milk, oil) and washing water
  • Chemical and petroleum industries: chemical corrosive liquids except for use in hazardous areas
  • Shipbuilding industries: fuels, hydraulic oils
  • Environnement and renewable energy sectors : measurement of homogeneous clean liquids accepting the propagation of ultrasonic waves (service water, wastewater, industrial water, seawater, pure water, irrigation water, oil, etc.) in full pipes except for open channel application.

Our ultrasonic flow measuring instruments measure any liquids at high accuracy even in difficult applications with a maximum process temperature of 200 °C. It cannot measure gas flow rate. The ultrasonic signals of the sensors automatically adapt the energy beam to the quality of the pipe and to the liquid being measured by the clamp on meters.

So you can measure with confidence whatever your needs are, even if your piping is corroded.

Ultrasonic flow meter selection guide

We offer several versions and types of ultrasonic flow meters:

Need help or want to save even more time?

To meet your needs, we offer on-site commissioning services including installation, configuration and training of your staff.

Modelsflr flow meterfsv time delta c flow meterfsv time delta c advanced flow meterfsc portable flow meter
Ultrasonic flow meter
for liquids
Ultrasonic flow meter for liquids
Ultrasonic flow meter for liquids
Portable ultrasonic flow meter for liquids
Clear liquids without air bubbles++++++++
Viscous liquids++++
Corrosive liquids++++++++
Non-conductive liquids++++++++
Low flow rates++++
Pulsed flows(1)(1)(1)(1)
High temperature++++
High pressure++++++++
ProtectionIP65IP66 (IP67 option)IP67IP64
Pipe diameter
for flanged ultrasonic flow meters
Pipe diameter
for non-intrusive ultrasonic flow meter
Ultrasonic sensor FSSA
25 to 225 mm (inner diameter) / -40 to +100°c
Ultrasonic sensor FSSC
50 to 1200 mm (inner diameter) / -20 to +120°c
Ultrasonic sensor FSSD
13 to 300 mm (inner diameter) / -40 to +100°c
FSSE ultrasonic sensor
200 to 6000 mm (inner diameter) / -40 to +80°c
Ultrasonic sensor FSSH
50 to 400 mm (inner diameter) / -40 to +200°c
Max. pressureNo pressure limit
Fluid temperatureDepending on the ultrasonic sensor used
Liquid flow scale0 to ±0.3...10 m/s0 to ±0.3...32 m/s
Measurement accuracy±1.5 %±1.0%
Depends on diameter and speed
Power supply100-240 Vca 50/60 Hz or 20-30 Vcc100-240 Vca 50/60 Hz12-hour battery
12 Vca or 100-240 Vca

na: Non applicable
(1): Applicable under conditions
+: Applicable
++: Recommended

Choose our ultrasonic flow meters and revolutionize your industrial processes!