Ultrasonic flowmeter for custody transfer (CT) measurement of gases

  • 12-chord meter, for high accuracy flow metering of natural gas
  • CT: OIML R137 (class 0.5), MI-002, AGA9 etc.
  • Many variants, extensive CBM diagnostics free of charge
  • Flange: DN100…1600 / 4…64"; max. PN450 / ASME Cl 2500

ALTOSONIC V12 – Standard version

ALTOSONIC V12 Ultrasonic flowmeter – Standard version

The ALTOSONIC V12 is a 12-chord ultrasonic custody transfer (CT) flowmeter for natural gas. It has been designed to offer the best possible measurement accuracy, not only during calibration under ideal conditions but also during 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.

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. CBM flowmeter diagnostics are standard and give an exact picture of what is happening inside the flowmeter. With the optional KROHNE Care diagnostic expert system an integrated web server becomes available that presents the results as an easy to access webpage – in plain language.

Product highlights

  • Complete product family for widest application range

  • 12 acoustic chords for excellent swirl immunity and built-in redundancy
  • Dedicated diagnostic path for deposits, dirt or changes in surface roughness
  • 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
  • Free of charge condition-based monitoring (CBM)
  • Optional with KROHNE Care system for 24/7 evaluation of meter health and accuracy

Typical applications


  • Custody transfer and allocation metering of natural gas
  • Pipeline leak detection applications
  • Master metering
  • Check metering

Oil and gas industry

  • On- and offshore oil and gas production
  • Pipeline metering station
  • Large consumers of natural gas
  • LNG production and regasification
  • Underground gas storages (UGS)
  • Border stations
  • Natural gas distribution

Product variants

ALTOSONIC V12 Check Ultrasonic flowmeter


Ultrasonic flowmeter for redundant gas flow measurement

  • With second flow converter
  • Uses the vertical path as an additional integrated check measurement path
  • CT: OIML R137 (class 0.5), MI-002, AGA9, ISO 17089 etc.
  • No flow conditioner required
ALTOSONIC V12 Ultrasonic flowmeter – Standard version


Ultrasonic flowmeter for gases with extremely high concentrations of CO2

  • With direct path configuration
  • CT: OIML R137, MI-002, AGA9, ISO 17089 etc.
  • Suitable for very low pressure applications
  • Flow conditioner required
ALTOSONIC V12 Ultrasonic flowmeter – Standard version


Ultrasonic flowmeter for high accuracy gas flow measurement

  • Standard 12 chord design with a single reflection
  • Highest possible measurement accuracy for natural gas (OIML R137, class 0.5)
  • Minimal inlet requirements, no flow conditioner necessary
  • Dedicated ultrasonic chords for diagnostics and predictive maintanance
ALTOSONIC V12 Twin Ultrasonic flowmeter


Ultrasonic flowmeter for two independent custody transfer (CT) measurements

  • Combines two flow meters in one installation
  • Enables fully redundant measurement without additional spool sections or flow conditioners
  • CT: OIML R137 (class 0.5), MI-002, AGA9, ISO 17089 etc.
  • No common failure: two independent path configurations possible


Related products


Flow computer for custody transfer (CT) measurement

  • Cost effective solution due to modular hard- and software design
  • Full colour graphical touch screen for maximum process transparency
  • Easy operator access enabling time efficient maintenance
  • Automatic Performance Monitoring extends recalibration interval

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