Radar (FMCW) level transmitter for liquids with hygienic requirements

Non-Contact Level Meters – OPTIWAVE 3500 C
  • Continuous, non-contact level measurement in high and narrow, small and agitated tanks
  • 80 GHz radar, Lens antenna
  • Measuring range: 0…50 m / 164 ft
  • Up to +150°C / +302°F and 25 barg / 362 psig

The OPTIWAVE 3500 is a 2-wire 80 GHz radar (FMCW) level transmitter for liquids in hygienic applications. It is designed for continuous, non-contact level measurement in the food and beverage as well as pharmaceutical industry. The device features a flush-mounted PEEK Lens antenna with a small beam angle and dead zone for precise measurement even in small and narrow tanks with agitators. It is equally suited for use on larger tanks up to measuring distances of 50 m / 164 ft.

The OPTIWAVE 3500 fits applications with any finished or raw product – from raw milk, wine or juice to solvents. As the radar withstands process temperatures up to +150°C | +302°F and pressures up to 25 barg / 362 psig, it can be used in CIP/SIP cleaning procedures. The OPTIWAVE 3500 offers a large choice of hygienic process connections. It comes with extensive device diagnostics as well as HART®7 communication.

Product highlights

  • 2-wire, loop-powered, with HART®7
  • Small dead zone and beam angle (8° with DN40 / 1.5” antenna, 10° with DN25 / 1” antenna)
  • ± 2 mm / 0.08” accuracy
  • Can measure in fast moving processes (≤60 m/min | 196.85 ft/min)
  • Empty tank spectrum function eliminates false reflections caused by tank internals
  • Suitable for SIP (Sterilisation In Place) and CIP (Cleaning In Place)
  • Large choice of hygienic process 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
  • Conform to FDA, EC 1935/2004, EC 2023/2006 and EU 10/2011
  • 3-year-warranty

Typical applications


  • Hygienic level applications with finished and raw products
  • For use in/on high and narrow storage tanks, small storage tanks and agitated tanks

Food and Beverage Industry

  • Fruit extract
  • Beverages (soft drinks, beer, wine, fruit extract etc.)
  • Yeast
  • Raw milk, cheese and other dairy products
  • Chocolate
  • Soup
  • Vegetable oil
  • CIP media (incl. slightly corrosive acids and caustic solutions)

Pharmaceutical Industry

  • Purified water
  • Solvents, alcohols, bases
  • Slightly corrosive acids