Radar (FMCW) level transmitter for solids from granulates to rocks

  • Continuous, non-contact level measurement in/on silos, stock piles, conveyor belts etc.
  • 24 GHz radar, Horn or Drop antennas
  • Measuring range: 0…100 m / 328 ft
  • -50…+130°C / +266°F; -1…16 barg / -14.5…232 psig

OPTIWAVE 6400 – Version with Drop antenna and low-pressure flange

OPTIWAVE 6400 Radar (FMCW) level transmitter – Version with Drop antenna and low-pressure flange

The OPTIWAVE 6400 is a 2-wire 24 GHz radar (FMCW) level transmitter for basic applications with solids. This radar is designed for continuous, non-contact level measurement of stones, plastic granulates, coffee beans and other products in solids processing of various industries. The level transmitter features a Metallic Horn antenna as well as PP and PTFE Drop antennas. The Drop antenna design minimizes scaling and is unaffected by the angle of repose. Hence no need for expensive antenna aiming kits or purging systems.

The OPTIWAVE 6400 provides accurate and reliable readings, despite uneven product surfaces or dusty atmospheres. Due to its small beam angle and its high dynamic range, the 24 GHz radar can measure distances up to 100 m / 328 ft. This makes it a cost-effective, yet more powerful alternative to pulse radar transmitters. It also has approvals for use in hazardous areas. The radar transmitter offers flange or thread connections as well as optional antenna extensions to suit any nozzle length. It comes with HART®7 communication.

Product highlights

  • 2-wire, loop-powered, with HART®7
  • Built-in configurations for different surface profiles
  • PP or PTFE Drop antenna:
    • Insensitive to product build-up
    • Small beam angle (4° with DN150 /6” PTFE Drop antenna)
    • Ellipsoidal shape and smooth surface to prevent scaling
    • Unaffected by angle of repose – no need for antenna aiming kits
    • New DN100 / 4" for distances up to 80 m / 262.5 ft
  • 316L metallic Horn antenna:
    • DN200 / 8" antenna for distances up to 100 m / 328 ft
    • Optional purging system
  • ± 2 mm / 0.08” accuracy
  • Spare converter compatible with all OPTIWAVE 6300 C process connections (Quick Coupling)
  • Antenna extensions to suit any nozzle length
  • 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® DDs and DTMs provided free of charge with full functionality
  • 3-year warranty

Typical applications


  • Level measurement in/on buffer silos, hoppers, stock piles, bulk storage containers, rock crushers, conveyor belts etc.

Minerals and Mining Industry

  • Rock products of different sizes, e.g. stone, gravel, grid, sand
  • Aggregates, e.g. recycled concrete, slag
  • Iron ore
  • Coal, coke
  • Limestone
  • Salt chunks

Chemical Industry

  • Fertilizers
  • Plastic shapes and granulates (PE, PP, PVC)

Power Industry

  • Cereals
  • Coffee beans
  • Dry yeast
  • Pet food

Iron, Steel and Metal Industry

  • Iron ore (blast furnace)

Power Industry

  • Coke and coal

Pulp and Paper Industry

  • Woodchips

Technical data

Product type Level transmitter
Measurement principles Radar
Level measurement type Continuous measurement
Measured media Solids
Contact to measured medium No
Interface measurement No
Measuring range (solids) 0…100 m/
0…328 ft
Process pressure (relative) -1…16 barg/
-14.5…232 psig
Pressure ratings EN (1092-1): PN40
ASME (B 16.5): Cl 300#
JIS (B 2220): 10k
Process temperature -50…130°C/
Ambient temperature -40…80°C/
Wetted parts Polypropylene (PP), Austenitic stainless steel (1.4404/316L)
Process seals EPDM, FKM/FPM, Kalrez® 6375


Certificates/Approvals Ex IECEx, NEPSI, cQPSus, EAC, ATEX
Certificates/Approvals Others CRN
Ingress protection NEMA4X/6P, IP66/68


Digital outputs HART®
Analogue outputs Current (mA)

Process connections

Flange connections EN (1092-1): DN80…200
ASME (B 16.5): 3…8"
JIS (B 2220): 40...200A
Thread connections Male:
G1, G1 1/2
1 NPT, 1 1/2 NPT

Download Center

  • Technical datasheets and handbooks
  • Flyers and brochures
  • Certificates and approvals
  • Software and driver
View OPTIWAVE 6400 related downloads