WPA-224-4 PILOTREK - radar level sensor

WPA-220-4 PILOTREK - Radar level gauge

PILOTREK is a low-cost radar level sensor designed as a qualitatively higher replacement for ultrasonic sensors, especially in water and wastewater treatment.

The flood-proof housing of the sensor with IP 68 protection ensures its long-term maintenance-free operation.



  • High measurement accuracy up to ±2 mm
  • Virtually zero temperature dependence
  • Measurement is not affected by pressure or dust
  • Accurate measurement even in the presence of foam on the surface
  • Zero deadband below the sensor (with slightly increased measurement inaccuracy in the area up to 25 cm below the sensor)
  • Narrow radiation angle of 7° allows the sensor to be used even in confined spaces in underground sumps
  • Independence of measurement from ambient noise generated during filling of the tank
  • User-friendly adjustment of the limits without the need to fill and empty the tank
  • No maintenance requirements (no condensation or dust on the sensor)
  • Inexpensive radar sensor as a qualitatively superior replacement for ultrasonic sensors
  • Two-wire 4-20 mA connection to stations H1, H2, H3, H7, Q2, even in battery-powered sets operating in switched mode

Areas of application

Non-contact level measurement of liquids and sludge or bulk solids of larger fractions.

The sensor is capable of measuring liquids even under high pressure and extreme temperatures. It can therefore be used for monitoring the level of wastewater sumps. The sensor is also suitable for applications with the highest hygiene requirements. Measurements are not affected by condensation on the sensor or foam on the measured level.

For the measurement of bulk solids, the sensor is resistant to acoustic interference during filling as well as to high dust levels and dust adhesion on the sensor.

The principle of measurement

The sensor transmits a frequency modulated radar signal in the 80 GHz band via an antenna system. The frequency of the signal varies in a sawtooth pattern. The transmitted signal reflected from the medium is received by the antenna as an echo with a changed frequency. The change in frequency is proportional to the measured distance.


Technical parameters 

  • Maximum measuring range: 20 m
  • Process connection: threaded connection: G1½ 
  • Process temperature: -40...80 °C
  • Process pressure: -1...3 bar (-100...300 kPa)
  • Accuracy: ±2 mm
  • Frequency: 77-81 GHz
  • Radiation angle: 7°
  • Zero deadband
  • Wetted parts: PVDF
  • Degree of protection: IP66/IP68 (3 bar)
  • Output signal: 4...20 mA
  • Ambient temperature: -40...+60 °C
  • Supply voltage 12...36 V DC
  • PVC connection cable: length 5 m, diameter 6 mm
  • SMART protocol for parameter setting (BT also in preparation)

Holders and radiation covers for radar level gauges

The stainless steel holder DUK1 or DUK2 can be ordered together with the PiloTREK level gauge. Both holders are characterized by their robust design and contain a radiation sensor cover open on only one side, which can also serve as a protection against vandalism.

The DUK1 holder is designed for mounting on a vertical mast using stainless steel Bandimex strips, the DUK2 holder is adapted for mounting on a horizontal boom using stainless steel brackets.

Price list