Flo-Sonic FPFM

The Flo-Sonic FPFM is a permanent measurement system for full pipe applications using the ultrasonic transit time technology. It is designed to suit a large range of applications for clean to polluted water with pipe diameters ranging from 50 to 3000 mm. The Flo-Sonic FPFM can be equipped with either clamp-on sensors or insertion sensors.

The Flo-Sonic FPFM system consists of one ultrasonic speed processor and monitor and two Flo-Sonic probes per path. The Flo-Sonic FPFM can be equipped with up to 2 measurement paths and used as a dual flow meter measuring the flow on 2 different pipes controlled by the same processor and monitor.

Very complex applications can be equipped with up to 16 measurement paths. The Flo-Sonic OCFM uses the very latest electronic technology combined with highly efficient digital signal processing (D.S.P.). The D.S.P. technique maximizes the system performance giving the user significant benefits.

Operation principle:

The Flo-Sonic measurement principle is based on detecting the transit time of ultrasonic signal between two sensors. The transit time with flow is shorter than the transit time against flow direction. The difference between these transit times is proportional the average flow velocity along the measurement path.

Key Features:

  • Non-invasive external probes clamped on the pipe
  • Easy and quick installation
  • User friendly operation, set up by keypad or software
  • Automatic control of ultrasonic signal using the ESC mode (Echo Shape Control)
  • Automatic zero flow adjustment with “anti air bubble” signal processing
  • Robust, watertight (IP66) control unit enclosure
  • Power Supply: 10-36VDC / 100-250 VAC
  • Very high accuracy and sensitivity : 0.001 m/sec up to … 99m/sec
  • Probes available from –100°C to +180°C (pipe temperature)
  • Up to 2 measurement paths
  • Online data transmission combined with the Unitrans
  • Non-intrusive and pressure independent


  • Turbine intakes
  • Cooling water
  • Clean or wastewater
  • Drinking water supply
  • Industrial process
  • Irrigation
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