OPTISONIC 7300 Ultrasonic Flowmeter

Source: KROHNE, Inc.

The OPTISONIC 7300 is a universal 2-path ultrasonic gas flowmeter for process and utility gas measurements in oil and gas refineries or the chemical or petrochemical industries. It is also suitable for non-custody transfer natural gas applications or applications with (compressed) air, mixed or flue gases (up to +180°C / +356°F).

The measured volume flow can always be calculated to standard conditions using the input of temperature and pressure sensors, which can be directly connected to the device. Following the initial calibration, the device provides accurate measuring results (±1% error of measured value). The OPTISONIC 7300 does not have the limitations associated with turbine or other traditional gas flowmeters like periodical recalibrations, maintenance, pressure loss and a limited flow range. The flowmeter comes with various digital communication options.

Product highlights

  • Bi-directional flow measurement over a wide dynamic range (turndown ratio: 100:1)
  • Integrated volume correction to standard conditions (using pressure and temperature measurement)
  • With current inputs for external pressure and temperature sensors
  • NACE-approved grade 29 titanium transducers for maximum corrosion resistance
  • Largely independent of gas density and composition
  • Full bore design: No moving parts, no wear, no pressure loss
  • Compact or field-mounted version

Typical applications


  • Process metering and control of gases, air flows etc.

Oil and gas industry

  • Natural gas production, transport, storage and distribution
  • Underground gas storages (UGS)
  • Non-custody transfer (CT) gas applications

Chemical, petrochemical and other process industries

  • Process and hydrocarbon gases
  • Natural gas and compressed air consumption and other auxiliary service and supply line applications