FLUXUS F801 - The ultrasonic flow meter for Offshore and Mining applications


Oil Exploration and Extraction

  • Flow measurement of injection media, e.g. methanol
  • Flow measurement of injected and produced water
  • Flow Measurement at Separators
  • Measurement of the feeding process into sand separators for process management
  • Flow measurement of condensate
  • Measurement on high pressure systems
  • And more.

Mining Industry

  • For use in explosive atmosphere areas in the underground mining (Equipment group I, category M2)a
Technical Datasheet
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The FLUXUS F801 flow meter for liquids is FLEXIM's solution for explosion hazard environments Offshore (being ATEX (IECEx) approved for usage in zones 1 and 2).
With a flameproof field-enclosure made entirely of stainless steel, the flow meter is permanently sea spray and seawater proof and can easily be operated by a magnet pen without having to open the housing.

The FLUXUS F801 flow meter allows for an inherently bi-directional flow measurement of volume and mass flow rates of nearly any liquid media - ranging from crude oil to refined products - and can be equipped with various outputs to be used for a sophisticated process control. As the ultrasonic transducers are mounted on the outside of the pipe wall, enclosed in the rugged stainless steel VARIOFIX C mounting fixture, the system does not suffer from wear, tear or clogging and can't be a risk for leaks.

Due to it's matched and paired transducers as well as the internal temperature compensation (compliant to ANSI/ASME regulations), the measurement system is drift free and zero stable. Moreover, as the transducers calibration data is automatically loaded by connecting the transducer to the transmitter, set-up times are significantly reduced. As of its exceptional dual-uP technology, the high number of measuring cycles per second and the adaptive signal processing, the FLUXUSF801 flow meter produces stable and reliable measuring results even under the most difficult conditions.

The F801 flow meter can be applied at inner pipe diameters ranging from 10 mm up to 6500 mm (no limitations on pipe wall thickness or material) and media temperatures from -170 °C up to +600 °C (by usage of the high temperature mounting fixture WaveInjector).

With up to two measurement channels, the FLUXUS F801 flow meter can also be applied to difficult measurement points with non-ideal flow profiles. Even liquid streams with a high content of solids or gas bubbles are not a problem due to the innovative HybridTrek mode implemented into the flow computer.


  • Ultrasonic clamp-on flow meter with two measurement channels and ATEX Zone 1 approval 
  • Rugged seawater resistant SS316 Stainless Steel flameproof housing
  • Installation and parameterization without having to open the housing
  • Installation without process shut-down
  • Very cost efficient measurement system - virtually no maintenance needed
  • Stable, accurate and reliable measurement readings due to matched and temperature compensated transducers as well as innovative digital signal processing
  • Independent of entrained particles or gas bubbles
  • Flexible configurable outputs
  • Measurement at any pipe material, size, wall thickness and at temperatures from -170°C up to 400°C and beyond (with WaveInjector mounting fixture)
  • Independent of pressurization inside the pipe


Flow channels

1 or 2

Operating temperature of the transmitter

-20°C ... 50°C

Degree of protection


Functional Safety (acc. to IEC / DIN EN 61508)


Optional hazardous area classification

ATEX and IECEx Zone 1 and 2

ATEX Zone 1 mining certification optional


1 current, 1 binary (OC)

Also available

1 or 2 binary outputs (relay), 1 binary (OC) and 1 current, 1 binary (OC) and 1 frequency

Communication Protocol

HART, Modbus, RS485

Media temperature

-40°C ... 200°C (-170 °C ... +600 °C with WaveInjector mounting fixture for extreme temperatures)

Pipe diameter range

10 mm ... 6500 mm

Flow velocity range

0,01 ... 25 m/s

Measurement accuracy


±1,6 % of reading ±0,01 m/s

Measurement accuracy

(extended calibration)

±1,2 % of reading ±0,01 m/s

Measurement accuracy

(field calibrated)

±0,5 % of reading ±0,01 m/s


±0,15% of reading, ±0,01 m/s

Additional Notes

Corrosion-proof and seawater-proof flow meter; resistant to saltwater mist

Additional Notes

Connection enclosure and electronics enclosure are hermetically sealed

Additional Notes

Connection compartment: increased safety, Output circuits: intrinsic safety

Additional Notes

240V or 24V DC power supply version of the transmitter available