Radar level transmitters are ideal for a variety of water and wastewater applications



  • Accurate, non-contact measurement
  • Works in conditions where ultrasonic is not acceptable
  • Pulse radar measurement range 10 inches to 50 ft
  • Simple push-button calibration
  • Standard 4-20mA signal output
  • Optional RS485 digital output

Radar Level Transmitters Product Description

The WL900 Radar Level Transmitters offer a logical extension to ultrasonic devices, where application conditions are in need of non-contact liquid level measurement but ultrasonic level transmitter measurement is not acceptable.  The WL900 Radar Level Transmitters are ideal for a variety of water and wastewater applications where you have a reflective liquid that has a foaming surface, vapors, or dusty conditions beyond ultrasonic transmitter capabilities.  The Radar Level Transmitters are also unaffected by temperature, vacuums, pressure, methane, or CO2.

The WL900 Radar Level Transmitters use state-of-the-art radar pulse technology which provide accurate and reliable level measurements over their wide 10 inch to 50 foot range. With their simple push-button calibration system, the WL900 Radar Level Transmitters are easy to set up and maintain on the bench or in the field by following simple instructions. Simply aim the WL900 Radar Level Transmitters at your low range level set point and push the button to lock in the setting – do the same with the high level set point. This may be done before permanently installing the Radar Level Transmitter by aiming the instrument at a wall and using a tape measure to determine your exact range.

The WL900 Radar Level Transmitter’s rugged NEMA 4 (IP65) housing is available in either aluminum or 316L stainless steel for corrosive environments. A standard 2 inch NPT(M) process connection allows for quick and versatile installation of the Radar Level Transmitter. The Radar Level Transmitter’s polypropylene antenna rod is virtually corrosion proof.

Radar Level Transmitters Specifications

Radar Level Transmitter Power
     AC:  115 VAC, 60 Hz (± 20%) or 230 VAC, 50 Hz (± 20%), 1.7 VA
     DC:  12 to 30 VDC, 0.07 Amps max. @ 24 VDC
Radar Level Transmitter Outputs
     Signal:  4-20 mA, 6.1 uA resolution; 750 ohms
     Communication:  Optional RS232
Accuracy:  ±0.25% of maximum sensor range (in air)
Frequency:  6.3 GHz (or 5.8 GHz CE)
Measurement Range:  10 inch to 50 ft (0.254 to 15.2 m)
Resolution:  0.22 in (5.7 mm)
Transmitter Power:  50 uW average
Calibration:  Push-button or optional programmable
Antenna:  Polypropylene over dielectric rod
Beam Angle:  12 degrees
Operating Temp:  -40°C to 60°C (-40°F to 140°F)
Operating Pressure:  150 psi max
Installation Category:  Class II
Process connection:  2 inch NPT
Conduit Entry:  1/2 inch NPT standard
Housing:  Aluminum or 316L stainless steel
Ingress Protection:  NEMA 4 (IP65)
Approvals:  FCC Part 15 – low-power communication device, CE -5.8 GHz Models
Weight:  3.6Lbs (1.63Kg)
Dimensions:  4 inch diameter x 18 inch long (10cm dia. x 45.7cm long)

Radar Level Transmitters Options

WL900-AC Radar Level Transmitter (PN# AQE100)
Power: 115VAC (60Hz), Enclosure: Aluminum

WL900-DC Radar Level Transmitter (PN# AQE200)
Power: 12 to 30 VDC, Enclosure: Aluminum

WL901-AC Radar Level Transmitter (PN# AQE300)
Power: 115VAC (60Hz), Enclosure: Stainless Steel

WL901-DC Radar Level Transmitter (PN# AQE400)
Power: 12 to 30 VDC, Enclosure: Stainless Steel


WL705 Ultrasonic Water Level Sensor
Specify Water Level Range: 3, 12, or 48 ft.  Includes 6 ft cable.

WL750 Ultrasonic Level Transmitter
Includes integrated display and user interface.

WL430 Sewage Lift Station Wastewater Level Sensor
Includes 40 ft of cable.

WL400 Water Level Sensor
When ordering, specify water level range that will cover the maximum water level change for your application (this is not necessarily the total depth of water): 0-3, 0-15, 0-30, 0-60, 0-120, 0-250, 0-500 ft.  Selecting the smallest water level range possible will ensure the greatest accuracy.  Includes 25 feet of cable.