Pipes carrying oil or liquefied gas are under high pressure. Retrofitting a flow meter to them can therefore be rather challenging. This is made even more difficult by the toxic and hazardous conditions found inside the pipe. The extreme atmospheric conditions (risk of explosion) on offshore platforms or in desserts impose the highest (Ex) demands on the measuring instruments used in this industry.

Ultrasonic flowmeters offer a solution for temporary measurements and permanent installations in potentially explosive environments according to the requirements of the oil and gas industry. The transmitter housing as well as the clamp-on sensors are ATEX certified (zones 1 and 2).


  • Suitable for most common pipe fittings, incl. stainless steel duplex and lined pipes
  • Non-invasive: Measuring from the outside of (existing) pipes
  • Cost-efficient: No interruption of production processes
  • Highly accurate
  • No pressure loss
  • No leakage problems / pollution
  • Clamp-on sensors : Externally installed
  • Diameter range : 10 mm to 6500 mm
  • Temperature range : up to 600 ° C (even higher for special applications)
  • Suitable for any pipe wall thickness, incl. steel SCH XXS
  • Suitable for wide spectrum of fluids and gases, for example : API gravity crude oil, liquid hydrocarbon with a single or multiple path, oil and gas recovery and processing fluids such as methylamine, triethylene glycol, methanol, water and produced water. (The latter is particularly important as a guarantee of compliance of the offshore drilling facilities with OPPC (Oil Pollution Prevention and Control) regulations).

The ultrasonic flowsensors are made of stainless steel, with IP 68 classification as a standard. The robust design makes the sensors ideal for use in offshore environments and areas where aggressive chemicals may be present.

The clamp-on sensors are installed on the outside of the high pressure pipe. Therefore there is no pressure loss, no risk of leakage / contamination and no interruption of the flow process.

Our flowmeters are simple to install. In an environment where access to specialist personnel could require helicopter flights, or very long and expensive journeys, having an instrument which is simple to install and commission is a considerable advantage. Anyone with basic technical training should be able to operate an ultrasonic flowmeter. Also you can count on our remote assistance, to ensure the whole process is as straightforward and inexpensive as possible.

If you prefer to leave the measurement procedure to our specialized, also authorized service engineers, we will be happy to perform the measurements on your behalf.

  • Methanol and water injection metering
  • Produced water measurements
  • Measurements on coiled tubing systems
  • Pump testing and inspection
  • Verification of in-line meters
  • Oil blending skids
  • Chevron
  • BP
  • Total
  • PSN Production Services Network
  • ConocoPhillips
  • Schlumberger
  • BG Group plc
  • Tullow Oil plc
  • Cameron
  • Petrofac
Olie en Gas - KATflow 150

Advanced fixed installation clamp-on ultrasonic flowmeter

Olie en Gas - KATflow 170

Fixed installation clamp-on ultrasonic ATEX flowmeter