Ultrasonic flow meter

For custody transfer of gases

Selected documents
Sales contact

WIKA Bulgaria EOOD

+359 2 8213810
+359 2 8213813


  • Industrial gases
  • Oil and gas
  • Petrochemical industry
  • Power supply
  • Process industry

Special features

  • Patented broadband continuous-wave technology
  • Simultaneous transmission on two or more paths
  • No pressure drop and no wear parts
  • Intrinsically safe design
  • Approved for custody transfer (MID MI-001, OIML R137-1 and -2)


By calculating velocity ratios between two or more ultrasonic paths, the simply constructed model FLC-UFL ultrasonic flow meter provides reliable gas flow measurement. Additional measured variables, such as sound velocity, signal-to-noise ratio or signal strength, are available for condition monitoring. For applications requiring integrated volume conversion, pressure and temperature sensors can be connected.

The flow meters are certified intrinsically safe for zone 0 in accordance with ATEX/IECEx and allow for easy and quick installation and commissioning since no special provisions for wiring and case are required.

The patented broadband continuous-wave technology ensures low-noise and reliable measurements, even in the most demanding applications. The epoxy-coated aluminium-alloy electronics case has an ingress protection of IP66 and NEMA 4X for outdoor use.
For offshore applications, a version in stainless steel is available. The wetted parts are made from titanium and designed for process gas temperatures of -30 °C [22 °F] up to +80 °C [+176 °F].

The model FLC-UFL provides comprehensive flow and diagnostic information on the local display and remotely via a PC software interface, enabling real-time data logging and condition monitoring.
The display shows an overview of the instrument's set parameters, such as units, pipe size and ultrasonic path configuration. Traceability information such as firmware version, checksums and serial numbers are also displayed.

The model FLC-UFL is supplied, as standard, with a pulse/frequency output and a USB port for commissioning and service. Via option boards, an isolated RS485 and two additional isolated pulse/frequency outputs as well as a 4 ... 20 mA/HART® output can be provided.

Ultrasonic flow meter
  • Ultrasonic flow meter
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