Ultrasonic flowmeter for high temperature liquids

  • 2-path meter for flow measurement of thermal oil, boiler feed water, crudes and hot feed flows in refineries
  • Up to +600°C / +1112°F
  • Flange: max. DN1000 / 40"
  • 3 x 4…20 mA, HART®7, Modbus, FF, Profibus-PA/DP


OPTISONIC 4400 HT Ultrasonic flowmeter

The OPTISONIC 4400 HT is a 2-path ultrasonic flowmeter for crudes, a broad range of refined products and other liquids that are processed at high temperatures. This makes the flowmeter the perfect choice for accurate flow measurement of high temperature feed flows in refineries. It is also highly suitable for flow measurement of molten salt or synthetic heat transfer oil with high and rapidly changing temperatures at concentrated solar power (CSP) plants. Other typical applications include condensate as well as feed water or spray water measurement at power plants.

Its dual path design compensates for variable flow profiles, maintaining unaltered measuring performance. Due to its rugged construction and its large dynamic range, the OPTISONIC 4400 boasts an excellent long-term stability and performs with minimum operational and maintenance costs. The flowmeter comes as field-mounted version. The meter is available with a wide range of materials as well as sizes and can also be used in hazardous areas. Digital communication options and extensive diagnostics round off the functionality of the device.

Product highlights

  • Bi-directional flow measurement over a wide dynamic range
  • Meets the requirements of the oil and gas industry: NACE MR 175/103 and ISO 15156 conformity
  • Independent of flow profile (Reynolds number) and product variations
  • Resistant to corrosive and abrasive products
  • Transducer replacement under process conditions
  • Extensive sensor and process diagnostics (incl. NE 107)
  • Optional heating jacket
  • Welded-end connections on request
  • No periodical maintenance or recalibration needed

Typical applications


  • Applications with high temperatures
  • Various conductive and non-conductive liquids

Chemical and petrochemical industries

  • Vacuum distillation and other HT refinery applications
  • Visbreaking or coker units
  • Heavy bottoms and main column bottoms
  • Vacuum residues
  • Quench oil

Conventional and nuclear power industry

  • Heat transfer circuits
  • Boiler feed water
  • HT feed water in combined power plants

Renewable energy industry

  • Thermal oil and molten salt in parabolic trough at concentrated solar power (CSP) plants
  • Molten salt applications up to +600°C / +1112°F in tower receiver CSP plants