Clamp on ultrasonic flow meter

Portable ultrasonic clamp on flow meter non-invasively measuring the flow rates of clean liquids in pipes with built-in thickness gauge and ability to incorporate heat quantity measurements

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Clamp on portable flow meter


Portasonic 2.FLO portable clamp on flow meter: The Award Winning Portasonic  to non-invasively measure the flow of any clean liquid through a wide variety of pipes. Can also be combined with the Portasonic® 2.FLO Calculator to calculate and store internal pressure readings!

Non-invasive utrasonic flow technology allows the internal flow of a pipe to be measured without the need to modify or acess the internals of the pipe in any form. Simply place sensors on the outside of the pipe, go through the setup process and instantly measure the speed and volume of liquid flowing through the pipe. This is used throughout proces industry, fire hydrant testing and numerous other testing and maintenance applications.

Key Features 

      • VersatileCapable of working on pipes DN15 – DN 2500, across multiple different pipes/pipe sections. Large internal database of pipe, fluid and lining materials (19+ for fluids, 23+ for pipe and lining materials)
      • Clamp-onClamp-on therefore no installation costs such as drilling into pipes and no downtime to the pipe network is present
      • Reliable –  Measures flow velocities between 0.01 m/s – 25m/s.
      • DiagnosticsIt has a built-in signal oscilloscope for sensor positioning and diagnostics to achieve maximum accuracy with the measurement while providing visibility of the potential issues with the installation for troubleshooting purposes.
      • Non-ContactThe fluid cannot damage the flowmeter, which could contribute to a longer lifespan and lower maintenance cost compared to inline flowmeters which are in contact with the fluid and risk being damaged by the pressurised flowing fluid


There are so many advantages and benefits of using the Portasonic® 2.FL0:

  • Accurate to +/- 0.5% under ideal conditions. Resolution of 0.25mm/s. Repeatability of 0.15% of measured value.
  • No risk: As there is no contact with the fluid being measured, there is no risk of pressure loss throughout your pipe network
  • Long life: IP65 main unit enclosure. Battery life up to 12 hours’ continuous use, standard 9V PP3 battery
  • Robust: Sensors temperature range -20°C to +150°C.. Sensors rated IP66

Clamp on flow meter – Part of the Level-Flow-Pressure Range

See the other 3 products in this range:

What's in the box

Portasonic 2.FLO main unit containing controls, display, battery, connection points and program. 

Pair of transducers, normally for pipes with diameters of 15mm – 700mm but we have other pipes available for larger or smaller pipes

Beaded chain clamps allowing users to fix the sensors in position 

Ultrasonic thickness gauge sensor 10mm sensor head. measuring range of 2mm to 20mm

Measuring tape

Ultrasonic copulant 

User & installation manual 

Robust carrying case

Techical specifications


portasonic 2.FLO

220 mm x 85 mm x 33 mm


Pipe diameter range

DN15 mm to DN 2,500 mm

0.5inch to 98 inches

PLease enquire to larger pipes 

Liquid Types

Most clean liquids with a solid content less than 10%


+/- 0.5% of measured value under normal conditions 

Flow velocity

0.01 m/s to 25 m/s


0.25 mm/s


0.15% of measured value 

Measurement Rate

1 Hz as standard

Measurement units

Flow velocity 

Volumetric flow rate

Mass flow rate

Energy flow rate (heat quantity)





Full 128 x 58 pixel graphic display with backlight 

Power Supply

9V PP3 battery

12 hours continuous use 

Operating temperature

Main unit : -10C to +65C

Sensor : -20C to +150C

IP Rating

Main unit – IP 65 enclosure 

Sensors – IP 66 

Sensor dimensions

Standard sensors – 40mm x 20mm x 25mm

Large sensors – 60mm x 30mm x 35mm

Cable length

1.5m as standard

additional lengths available on request 


  • Main unit – 3 Year Warranty 
  • Sensor –  1 Year Warranty 
  • Technical Support – Lifetime of the unit


Download Portasonic 2.FLO Brochure

For basic product information, please find below. If you have any other questions, please contact us directly.


Frequently asked questions

What materials can the Portagauge 5 test?

The portable ultrasonic thickness gauge can test any type of metal and most hard plastics. The most popular metals include steel, aluminium, copper and popular plastics include PVC, Polyethene and fibreglass to name a few!

How accurate is the Portagauge 5?

The Portauage 5 is accurate at testing true material readings (ignoring surface coatings) to within 0.01mm

How to test sprinkler pipes?

The Portaguage 5 can be used to test any sprinkler pipe or other metal piping to identify areas of corrosion, locations where there has been considerable erosion, areas of fungal deterioration and other forms of metal ware. The testing process involves carrying out a series of spot checks along the bottom of the pipe. It is on the bottom of the pipe where liquid will naturally pool and thus where you are much more likely to have areas of heavy corrosion. The user simply goes down the entire length of the sprinkler pipe and continually monitors the pipe thickness and the waveform. Both should be consistent along the full length of the pipe. As soon as the thickness or the waveform begin to deviate significantly, (and they will normally do so together) the equipment has identified an area likely to be compromised and thus further physical & visual inspections will be required.

Do I need training to use the Portagauge 5?

This equipment is incredibly easy to operate, and no dedicated training is required in order to use the unit. We provide operating instructions which is normally enough to provide an operator with confidence and the required knowledge. However, every Coltraco unit comes with free technical support for the lifetime of the equipment so if you do need any further assistance, our technical team are on hand to support

How long does it take to deliver the portable thickness gauge?

These units are almost always available ex stock from the UK. Delivery to the UK is normally next day, Europe in 2 – 3 days and most of the rest of the world in 3 – 4 days from order. Please contact our sales team for an update on availability and for any other questions.

I don’t need to ignore the paint layer. Will this still work for my needs?

The short answer is yes and normally triple echo thickness gauge technology can be used for any thickness measuring applications. We do also offer our Portagauge 3 technology however which uses single echo technology and will measure paint & material as one reading.

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