Radar (FMCW) level transmitter for liquids in water and wastewater applications

  • Continuous, non-contact level measurement in tanks, pumping stations, open channels etc.
  • Robust stainless steel (316L) design , waterproof (IP66/68 / NEMA 4X/6)
  • 24 GHz radar, PP Drop antenna
  • Measuring range: 0…20 m / 66 ft

OPTIWAVE 1400 with G thread

OPTIWAVE 1400 with G thread

The OPTIWAVE 1400 is a 2-wire 24 GHz radar (FMCW) level transmitter for liquids in water and wastewater applications. It is equally suited for continuous, non-contact level measurement of water from springs, rivers, lakes or the sea as well as rainwater, wastewater, sludge or other liquids in storage applications. The device features a robust 316L stainless steel housing and comes IP68 / NEMA 4X/6 rated for use in open air installations prone to flooding.

Its proven PP (polypropylene) Drop antenna, with the smallest beam angle (8°) on the market, guarantees accurate and reliable level measurement of liquids despite condensation, turbulent surfaces or foam. This makes it a more powerful, yet cost-effective alternative to pulse radar and ultrasonic level transmitters. The level radar offers thread as well as low-pressure flange connections and various other accessories.

Product highlights

  • 2-wire, loop-powered, with HART®7
  • FMCW technology for greater resolution, just like the new 80 GHz generation
  • Proven PP Drop antenna, insensitive to condensation or deposits
  • Narrow beam angle (8°) for a sharp focus on the medium
  • ±2 mm / ±0.08" accuracy
  • Maintenance-free concept
  • Installation and operation made simple, safe and secure
  • Extensive choice of accessories
  • PACTware™ HART® DD and DTM provided free of charge with full functionality
  • 3-year warranty

Typical applications

Water and wastewater industry

  • Liquid level measurement during extraction, transport, storage and distribution of water from springs, rivers, lakes or the sea
  • Level measurement in rainwater basins
  • Open-channel flow measurement
  • Level measurement of water, wastewater, sludge or other liquids in storage applications
  • Level monitoring in wastewater pumping stations
  • Floodwater alarm
  • Level measurement of liquids in plastic tanks (e.g. IBC)

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
Contact to measured mediumNo
Interface measurementNo
Measuring range (liquids)0…20 m/
0…66 ft
Process pressure (relative)-1…3 barg/
-14.5…43.5 psig
Pressure ratingsEN (1092-1): PN40
ASME (B 16.5): Cl 150#
Process temperature-40…+80°C/
Ambient temperature-40…+80°C/
Wetted partsAustenitic stainless steel (1.4404/316L), Ethylene propylene diene monomer (EPDM), Polypropylene (PP), Polyuretane (PUR)
Accuracy (liquids)±2 mm/
±0.08 in


Certificates/Approvals ExATEX, IECEx, NEPSI
Certificates/Approvals OthersWHG
Ingress protectionIP66/68, NEMA4X/6
NAMUR complianceNE 107, NE 43, NE 53


Digital outputsHART®
Analogue outputs4…20 mA

Process connections

Flange connectionsEN (1092-1): DN80…200
ASME (B 16.5): 3…8"
Thread connectionsMale:
G3 (bottom of housing)
G1 (top of housing)