The Permaflow is a fixed, clamp-on flow & heat meter. It uses complete non-invasive technology in which sensors can be positioned on the outside with no need to drill holes or adapt the system in any way, reducing cost, downtime, and increasing ease of setup. Being a very flexible platform with numerous bolt-on options, accessories, and applications, it offers an ideal solution for measuring the flow rates of most liquids with gas/solid content less than 10% of volume.


Fixed ultrasonic flow meter features

  • Versatile
    • Capable of working on pipes DN15 – DN 2500; virtually any clean liquids; on a wide range of pipe materials. Without contact with the fluid, there are also fewer issues with the flowmeter being damaged by the nature of the fluid it is measuring compared to inline flowmeters
  • Accurate
    • Capable of measuring flow velocities between 0.01 m/s – 25m/s. Resolution of 0.25mm/s
  • Reliable
    • Wall-mounted and fixed therefore suitable for conducting measurements in a wide variety of poor conditions as the equipment is affixed firmly to the wall
  • Low Cost
    • No installation costs such as drilling into pipes, therefore no downtime to the pipe network is present. Only one individual is required to operate the instrument


Key benefits of ultrasonic flow meter

  • Accurate: +/- 0.5% under ideal conditions. Repeatability of 0.15% of measured value
  • Monitoring: 24/7 flow rate monitoring and alert is available
  • Robust: Sensors rated IP66. Sensor temperature range -20°C to 150°C
  • Intuitive: Unique Human Machine Interface (HMI) driven menu emphasises user-friendliness

  • 16 MB datalogger included as standard – all measurement values can be logged
  • Serial Communications RS232 and USB included as standard, can be used for device control (command-line interface) and datalogger download via PC
  • 4 – 20 mA, Digital, Modbus, Relay, OPTO, Open Collector Output available as optional plug-in modules
  • PT100 Thermometer Input (for heat metering applications)
  • 4 – 20 mA Current Input
  • 4 – 20 mA Current Output
  • Digital InputModbus RTU
  • Relay Output
  • OPTO Output
  • Open Collector Output


    • Built-in signal oscilloscope for sensor positioning and diagnostics to achieve maximum accuracy with the measurement while providing visibility of the potential issues
    • Connection to PC available as standard using both RS232 and built-in USB as well as 4 – 20 mA inputs which is available as an optional plug in
    • All measured values can be totalised giving total flow rate measured during a particular measuring session
    • Commercial building heat metering, fuel montoring, waste water and many more
    • Ability to incorporate PT100 thermometer inputs so heat quantity measurement can be monitored alongside flow rate



215mm x 185mm x 100mm

840 grams

Pipe Diameter

DN 15 – DN 2,500 (0.5 inch to 98 inches)

please enquire for larger pipes

Liquid Types Most clean liquids with gas/ solids less than 10& volume
Accuracy ±0.5% of measured value under ideal conditions
Resolution 0.25 mm/s
Repeatability 0.15% of measured value
Measurement Units

Flow velocity

Volumetric flow rate

Energy flow rate

Heat quantity




Heat metering

Display 240 x 160 pixel graphics with backlight
Power Supply

12 – 36 VDC configurations at 10W, DC PSU supplied as standard

AC options are also available

Operating Temperature

Main unit: -100 to 65°C / 67°F to 160°F

Sensors: -200 to 150°C

Sensor Dimensions

40mm x 20mm x 25mm

Interested? Get in touch.

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