Fuji – FST Spool Piece Ultrasonic Flowmeter

FUJI-FST Spool piece Ultrasonic Flowmeter 
FST is an in-line ultrasonic flowmeter with three parallel measuring paths. With the latest digital signal processing technology and the calculation algorithm, it can deliver highly precise flow measurement. RS-485 communication is also available as an option.


  • Highly accuracy: ±0.2% of the rate
    • Using the new algorithm for calculating the flow velocity, it can measure any type of fluid with high accuracy.
  • Low maintenance
    • With no moving part, it has long-term stability while requiring only minimal maintenance work.
  • Bubble resistant
    • By using the advanced anti-bubble measurement technology, the interface from air bubbles is greatly eliminated.
  • For any liquid from -40°C to +150° C
    • Non-conductive fluid including oil, mixed liquid, purified, water can be measured.
  • Easy-to-operate
    • Backlit LCD and front keys
    • Troubleshooter provided
    • Can be vertically or horizontally installed


Measuring Principle
Transit time difference method
Parallel 3-path with the advanced ABM (anti-bubble measurement) system
0.2% of rate ( Flow velocity 1 m/s to 10 m/s
0.002% m/s (flow velocity 0.5 m/s to 1 m/s)
Diameter (mm)
25 (under development), 50, 80, 100
Flow Velocity Range
Minimum: 0 to 0.3 m/s or -0,3 to 0 m/s
Maximum: 0 to 10 m/s or -10 to 0 m/s
Flow Range
Diameter (mm)
Minimum (m³/h)
0 t0 0.54
0 to 2.13
0 to 4.65
0 to 7.99
Maximum (m³/h)
0 to 17.6
1 to 70.6
0 to 154.8
0 to 266.0
Dimension and Weight
Refer to the outline diagram
Power Supply
100-240V AC (+10% – 15%), 50/60 Hz or 20-30V DC
Power Consumption
Approx. 20 VA ( AC Power)
Approx. 6 W (DC Power)
Ambient temperature
-40º C to +60º C
Liquid Temperature
-40ºC  to +150º C
Bubble Content
≤12 vol %

Outline Diagram (Unit=mm)

Dimension Fuji FST
Reference : https://www.fujielectric.com/

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