Radar (FMCW) level transmitter for powders and dusty atmospheres

  • Continuous, non-contact level measurement in high and narrow silos, hoppers or containers
  • 80 GHz radar, Lens antenna
  • Measuring range: 0…100 m / 328 ft
  • -50…+150°C / -58…+302°F; -1…40 barg / -14.5…580 psig
  • Technology icon for 80 GHz radar level measurement

OPTIWAVE 6500 – Version with Lens antenna and thread connection

Radar (FMCW) level transmitter OPTIWAVE 6500 – Version with Lens antenna and thread connection

The OPTIWAVE 6500 is a 2-wire 80 GHz radar (FMCW) level transmitter for demanding applications with powders in very dusty atmospheres. With its small beam angle, this radar is particularly suited for continuous, non-contact level measurement in high and narrow silos, hoppers or buffer storage containers up to 100 m / 328 ft. Due to the high signal dynamics of the FMCW radar, the level transmitter is ideal for low-reflective media, dust, uneven surfaces or tanks with obstacles. As it features a flush-mounted PEEK Lens antenna, there is no intrusion of the antenna into the tank.

The OPTIWAVE 6500 provides accurate and reliable readings in process conditions with temperatures up to +150°C / +302°F and pressures up to 40 barg / 580 psig. It offers flange or thread connections as well as an optional 112 mm / 4.4" antenna extension for the DN40 / 1.5”antenna. Approvals for use in hazardous areas are also available. The level transmitter comes with HART®7 communication.

Product highlights

  • 2-wire, loop-powered, with HART®7
  • Extremely high dynamics for clear vision despite dusty atmospheres or low reflective media
  • Empty tank spectrum function eliminates false reflections caused by tank internals
  • Flush-mounted PEEK Lens antenna (no tank intrusion):
    • DN70 / 2.75" (concave Lens) with 4° beam angle for distances up to 100 m / 328 ft
    • DN40 / 1.5" (convex Lens) with 8° beam angle for distances up to 30 m / 98 ft
  • 112 mm / 4.4" antenna extension for long nozzles
  • Unaffected by angle of repose – no need for antenna aiming kits
  • Antenna purging system for flange connection without antenna extension
  • ± 2 mm / 0.08” accuracy
  • 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 high and narrow silos with internal obstructions, buffer silos, bulk storage containers, hoppers

Minerals and mining industry

  • Fine powders (e.g. building materials)
  • Cement
  • Gypsum
  • Lime
  • Filler
  • Fly ash

Chemical industry

  • Plastic powder
  • Silica
  • Soap powder

Food and beverage industry

  • Milk powder
  • Coffee powder
  • Chocolate powder
  • Flour
  • Starch
  • Salt, sugar

Power industry, iron, steel and metal industry

  • Coal, coke

Pulp and paper industry

  • Saw dust

Technical data

Product type Level transmitter
Measurement principles Radar
Level measurement type Continuous measurement
Measured media Powders
Contact to measured medium No
Interface measurement No
Measuring range (solids) 0…100 m/
0…328 ft
Process pressure (relative) -1…40 barg/
-14.5…580 psig
Pressure ratings EN (1092-1): PN40
ASME (B 16.5): Cl 300#
JIS (B 2220): 10k
Process temperature -40…150°C/
Ambient temperature -40…80°C/
Wetted parts Polyetheretherketone (PEEK)
Process seals EPDM, FKM/FPM, Kalrez® 6375
Accuracy (solids) ±2 mm/
±0.08 in


Certificates/Approvals Ex IECEx, NEPSI, cQPSus, EAC, ATEX
Certificates/Approvals Others CRN, NACE
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): 2…8"
JIS (B 2220): 40...200A
Thread connections Male:
G1 1/2, G3
1 1/2 NPT, 3 NPT

Download Center

  • Technical datasheets and handbooks
  • Flyers and brochures
  • Certificates and approvals
  • Software and driver
View OPTIWAVE 6500 related downloads