Ultrasonic gas flowmeter for custody transfer

ALTOSONIC V12 has been designed to offer the best possible measurement accuracy, not only during a calibration under ideal conditions but also during the less ideal conditions in the field. As a result ALTOSONIC V12 is the first ultrasonic flowmeter that was certified to OIML R137 class 0.5 by NMi.

This provides a significant improvement of the overall measurement uncertainty compared to more traditional ultrasonic gas flowmeters that are typically OIML R137 class 1 approved.

Due to its design with 12 acoustic chords a flow conditioner is no longer required; standards such as AGA9, ISO 17089 and MID are met with just 5D straight inlet piping. Flowmeter diagnostics are standard and give an exact picture of what is happening inside the flowmeter. With the optional KROHNE Care expert system the accuracy of the meter is even evaluated 24/7 inside the meter itself and an integrated web server presents the results as an easy to access webpage.


  • 12 acoustic chords for excellent swirl immunity and built-in redundancy
  • No flow conditioner required
  • Just 5D straight inlet piping required to comply to AGA9, ISO 17089 and MID
  • First ever ultrasonic flowmeter to receive OIML R137 class 0.5 approval by NMi
  • Meter accuracy evaluated 24/7 by optional web-based KROHNE Care expert system


  • Oil & Gas
  • Natural gas distribution
  • Large consumers of natural gas


  • Custody transfer and allocation measurement
  • Border stations
  • Large transfer points
  • Master metering
  • Check metering
  • LNG production and regasification