Radar (FMCW) level transmitter for liquids in basic process applications

  • Continuous, non-contact level measurement in closed tanks or in the open air
  • 24 GHz radar, Horn or Drop antennas
  • Measuring range: 0…100 m / 328 ft
  • -50…+130°C / -58…+266°F; -1…16 barg / -14.5…232 psig
  • Icon/Logo Security Integrity Level 2/3 (SIL 2/3)

OPTIWAVE 5400 – Version with Horn antenna and flange connection

Radar (FMCW) level transmitter OPTIWAVE 5400 – Version with Horn antenna and flange connection

The OPTIWAVE 5400 is a 2-wire 24 GHz radar (FMCW) level transmitter for liquids in basic process applications. It is particularly designed for continuous, non-contact level measurement in the chemical, petrochemical, power as well as oil and gas industry. It can be equipped with a PP Drop antenna for condensing atmospheres and corrosive media but features also Metallic Horn antennas. Due to its high dynamic range, the 24 GHz radar can measure distances up to 100 m / 328 ft.

The OPTIWAVE 5400 provides accurate readings even in processes with fast changing levels, in closed tanks or in the open air (dams, rivers etc.). This level transmitter can replace radars in basic applications requiring higher accuracy. It offers flange or thread connections as well as optional antenna extensions to suit any nozzle length. It is approved for hazardous areas and comes with extensive device diagnostics (acc. to NE 107) as well as HART®7 communication.

Product highlights

  • 2-wire, loop-powered, with HART®7
  • PP Drop antenna:
    • Insensitive to condensation
    • Small beam angle (5° with DN150 / 6″ Drop antenna)
    • Ellipsoidal shape and smooth surface to minimise scaling
    • PP flange plate protection and cladded antenna extensions for corrosive media
    • New DN100 / 4″ Drop antenna for distances up to 80 m / 262.5 ft
  • 316L Metallic Horn antenna with optional purging system
  • ± 2 mm / ±0.08″ accuracy
  • Antenna extensions to suit any nozzle length
  • Empty tank spectrum function eliminates false reflections caused by tank internals
  • Large choice of flange and thread connections
  • Large, backlit LCD screen with 4-button keypad for operation with bar magnet; no need to open the housing cover
  • PACTware™, HART® DD and DTM provided free of charge with full functionality
  • Extensive device diagnostics acc. to NAMUR NE 107
  • SIL 2/3 certified acc. to IEC 61508 for safety-related applications
  • 3-year warranty

Typical applications


  • Level measurement in storage, process or batch tanks (max. 100 m / 328 ft) and open air applications (dams, rivers etc.)
  • Storage and process tanks requiring high accuracy
  • Processes with fast changing levels (≤60 m/min / 196.85 ft/min)

Chemical Industry

  • Alcohols e.g. methanol, ethanol
  • Solvents, acids, bases
  • Phosphorus
  • Additives
  • Condensates
  • Lime slurry

Petrochemical Industry, Oil and Gas Industry

  • Fuels
  • Hydraulic oils and other hydrocarbons

Power Industry

  • Process and cooling water

Accessories for this product


Handheld for in-depth verification, device commissioning and monitoring

  • On-site performance check and verification (level 0,1,2) without process interruption
  • Convenient commissioning of field devices, e.g. zero calibration
  • Detailed reports for proof test documentation of safety loops acc. to IEC 61508/61511, and for quality management systems (ISO 9001)

View product details
Wall-mounted bracket

Wall-mounted bracket

Antenna aiming kit for OPTIWAVE level transmitters

  • L-shaped bracket to attach radar level transmitters firmly to a wall
  • Only suitable for radars with G1 or G1½ process connection
  • Material: Stainless steel (1.4404 / 316L)
  • Bracket length: 250mm / 9.84”

Hanging bracket

Hanging bracket

Antenna aiming kit for OPTIWAVE level transmitters

  • Orientable bracket to position a radar level transmitter at any angle up to a 45° angle
  • To direct the beam angle of the radar into the correct part of a tank, silo or stockpile
  • Material: stainless steel (1.4404 / 316L)
  • EPDM sleeve for increased grip of the radar

Low pressure flange disc

Low pressure flange disc

Process connection for OPTIWAVE level transmitters

  • Stainless steel disc to enable firm and even installation of level radars into onto tanks and silos
  • Suitable for radars with G1, G1½, G3, 1 NPT, 1½ NPT or 3 NPT process connections
  • Available in sizes DN50…DN200 / 2…8”
  • Low pressure conditions only: max. 1 barg at 20°C / 14.50 psig at +68° F

Technical data

Measurement principlesRadar
Level measurement typeContinuous measurement
Measured mediaLiquids, Pastes, Slurries
Contact to measured mediumNo
Interface measurementNo
Measuring range (liquids)0…100 m/
0…328 ft
Process pressure (relative)-1…16 barg/
-14.5…232 psig
Pressure ratingsEN (1092-1): PN40
ASME (B 16.5): Cl 300#
JIS (B 2220): 10k
Process temperature-50…+130°C/
Ambient temperature-40…+80°C/
Wetted partsAustenitic stainless steel (1.4404/316L), Polypropylene (PP)
Process sealsEthylene propylene diene monomer (EPDM), Fluorocarbon-based synthetic rubber (FKM/FPM), Kalrez® 6375
Accuracy (liquids)±2 mm/
±0.08 in


Certificates/Approvals ExATEX, cQPSus, EAC Ex, IECEx, KCs, NEPSI
Certificates/Approvals SafetySIL2/3
Certificates/Approvals OthersCRN / ASME B31.3, NACE, WHG
Ingress protectionIP66/68, NEMA4X/6P
NAMUR complianceNE 107, NE 21, NE 43, NE 53


Digital outputsFOUNDATION™ fieldbus, HART®, PROFIBUS PA
Analogue outputs4…20 mA

Process connections

Flange connectionsEN (1092-1): DN40…200
ASME (B 16.5): 1½…8"
JIS (B 2220): 40…200A
Thread connectionsMale:
G1, G1½
1 NPT, 1½ NPT