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

  • Continuous, non-contact level measurement in tanks, pumping stations, open channels etc.
  • Robust stainless steel design, waterproof (IP68 / 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 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
  • Robust stainless steel design
  • Maintenance-free concept
  • Installation and operation made simple, safe and secure
  • PACTware™ HART® DD and DTM provided free of charge with full functionality
  • 3-year warranty

Typical applications

Water and wastewater inductry

  • 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)

Case studies

Technical data

Product typeLevel transmitter
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
Process temperature-40…+80°C/
Ambient temperature-40…+80°C/
Wetted partsAustenitic stainless steel (1.4404/316L), Polypropylene (PP)
Accuracy (liquids)±2 mm/
±0.08 in


Certificates/Approvals OthersWHG
Ingress protectionIP68, NEMA4X/6
NAMUR complianceNE 107, NE 43, NE 53


Digital outputsHART®
Analogue outputs4…20 mA