Radar (FMCW) level transmitter for liquids in narrow tanks with internal obstructions

Non-Contact Level Meters – OPTIWAVE 7500 C
  • Continuous, non-contact level measurement in small and narrow tanks with agitators as well as tanks with long nozzles
  • 80 GHz radar, flush-mounted Lens antenna
  • Measuring range: 0…100 m / 328 ft
  • Up to +150°C / +302°F and 40 barg / 580 psig

The OPTIWAVE 7500 is a 2-wire 80 GHz radar (FMCW) level transmitter for very demanding liquid applications involving narrow tanks with long nozzles and internal obstructions like agitators or heating coils. Its very small beam angle and negligible dead zone make this FMCW radar the optimal choice for continuous, non-contact level measurement in both extremely small and very high tanks (up to 100 m / 328 ft). The level transmitter is even able to measure through tank roofs made of non-conductive materials. Its PEEK Lens antenna is insensitive to deposits and well suited for corrosive environments. As the antenna is flush-mounted, there is no intrusion into the tank.

The OPTIWAVE 7500 provides accurate readings even in processes with fast changing levels. It can be used in operating temperatures of up to +150°C / +302°F and pressures up to 40 barg / 580 psig. This level transmitter offers a wide range of flange connections and thread connections (starting from ¾”). It comes with approvals for use in hazardous areas as well as extensive device diagnostics (acc. to NE107) and HART®7 communication.

Product highlights

  • 2-wire, loop-powered, with HART®7
  • Small beam angle (4° with DN70 / 2.75” Lens antenna)
  • PEEK flange protection against corrosive media
  • 112 mm / 4.4" antenna extension for long nozzles
  • Empty tank spectrum function eliminates false reflections caused by tank internals
  • ± 2 mm / 0.08” accuracy
  • Can measure in processes with fast changing levels (≤60 m/min | 196.85 ft/min)
  • Wide range of flange or thread connections
  • Large, backlit LCD screen with 4-button keypad for operation with bar magnet; no need to open the housing cover
  • PACTwareTM, HART® DD and DTM provided free of charge with full functionality
  • Extensive sensor diagnostics (incl. NE 107)
  • 3-year warranty

Typical applications


  • Level measurement in/on small and narrow tanks with internal obstructions (e.g. heating coils, agitators,…)
  • Level measurement in tanks with long nozzles
  • Processes with fast changing levels (≤60 m/min / 196.85 ft/min)
  • High accuracy applications where ±2 mm / 0.08¨ is specified

Chemical Industry

  • Solvents, acids
  • Foaming agents
  • Urea
  • Chlorine
  • Resins
  • Paint, ink
  • Corrosion inhibitors
  • Lime milk

Petrochemical Industry, Oil and Gas Industry

  • Liquefied Petroleum gas (LPG)
  • Hydrocarbons and fuels
  • Slop oil
  • Drilling mud
  • Ethylene
  • Lubricant oil

Power Industry

  • Hydrocarbons