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Yokogawa Electric Corporation





US300FM Ultrasonic Flowmeter

The model US300FM is an ultrasonic flowmeter for measuring liquid flow in a fully filled pipe. With the advanced signal processing and correlation detection method, US300FM provides fast, accurate, and no-zero offset flow measurements in clean to dirty fluids. Easy setup with interactive parameter setting. Easy adjustment with no zero-offset transducers

Product Information

Easy setup and easy adjustment

US300FM Ultrasonic Flowmeter

US300FM (main unit) Transducers (fixed on a pipe) for US300FM
US300FM (main unit) Transducers for US300FM
(attached to pipe)
  Ultrasonic Flowmeters catalog
  Ultrasonic Flowmeters General Specifications
  Ultrasonic Flowmeters User's Manual
  Ultrasonic Flowmeters Drawings


  • More accurate measurements under difficult conditions
    • New noise suppression technique improves accuracy of measurements with fluids where air bubbles are present
  • Fast response
    • Yokogawa signal processing technology improves the speed and accuracy of measurements
  • Easy installation and adjustment of transducers
    • Transducers are small and light – can be held in one hand
    • Each sensor calibrated before shipment, eliminating need to tune on-site
    • No longer necessary to adjust the zero flow condition
  • Easy setup with interactive parameter setting process
  • Two flow-input channels are provided as an option
  • A maximum of two current outputs enable the simultaneous measurement of flow and sound velocity


US300FM Performance


Liquid with turbidity < 10,000 mg/litter, fluid sound velocity 800 to 3,500 m/s)

Measured values

Volume flow, mass flow (by setting density), flow velocity, sound speed in fluid (when optional wall thickness probe is provided)

Pipe size

25 to 6,500 mm

Pipe material

Carbon steel, stainless steel, gray cast iron, ductile iron, copper, glass, PVC, etc.

Flow velocity range

0.01 to 25 m/s

Fluid temperature range

-30 deg to +130 deg C. (general use)
-30 deg to +200 deg C. (high-temperature use)


1% to 3% of reading (depends on application)

Straight pipe run upstream

More than 10 D (depends on the piping conditions)

Main unit construction

Housing material

Aluminum (powder coated)

Water/dust proof


Dimensions (HxWxD)

200 mm x 280 mm x 71 mm


Approx. 2.8 kg

Transducer construction

Case material

Stainless steel SUS316 Ti

Water/dust proof

IP65 (General purpose), IP67 (Immersible)


Calculation of the two flow inputs

Two values from an average (for two path measurement), sum, or difference for channel A and channel B inputs

Time-programmable measurement

Automatic start and stop of measurement using internal clock. Can be used with data logging or communication function.

Parameter setting storage

Storage of pipe and fluid parameters (Maximum of 80 different settings)

Sound velocity measurement

Measurement of the sound velocity in the liquid


Pure water measurement for semiconductor industry

  • Hot water measurement for food industry CIP
  • Cooling water measurement (including water containing iron powder) for iron and steel industry
  • Flow monitoring for water supply and sewerage lines

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