Key features


  • Measuring wind direction and speed insusceptibly to bird nesting thanks to roofed construction

  • All-in-one housing concept of a compact weather sensor combining 6 measurement parameters in one housing with only one cable connection

  • Tuiltable Kipp & Zonen CMP3 Pyranometer integrated into all in one housing

  • Built-in data pre-processing, universal interfaces and selectable output protocols

  • Maintenance-free operation – no moving parts that can wear out

  • Compatible with many commercially available Met/HydroMet data loggers and PLS systems thanks to an open communication protocol

  • Suitable for all climate zones; also for solar-powered automatic meteorological stations

  • Ventilated temperature and humidity measurement according to WMO guidelines

  • Integrated heater that can be switched on if there is danger of frost


From the WS product family of professional intelligent measurement transducers with digital interface for environmental applications. Integrated design with ventilated radiation protection for measuring: Air temperature, relative humidity, air pressure, wind direction and wind speed. One external temperature or rain sensor is connectable.

Lufft WS503-UMB

  • General

    Dimensions Ø approx. 150mm, height approx. 392mm
    Weight Approx. 1.5kg
    Interface RS485, 2-wire, half-duplex
    Power supply 11…32 VDC
    Power supply 5…11 VDC (electronics with limited precision of measurements)
    Power supply 24 VDC +/- 10% (heater)
    Power consumption 20 VA (heater)
    Operating temperature -50...60°C (with heater)
    Operating rel. humidity 0...100% RH
    Cable length 10m
    Protection level housing IP66
    Standards/Regulations Compliant to IEC 61724-1:2017 Class C
    Mast mounting suitable for mast diameter 60 - 76mm


    Response time (95%) < 18 s
    Non-stability (change/year) < 1 %
    Non-linearity (0 to 1,000W/m²) < 1 %
    Directional error (at 80° with 1,000W/m²) < 20 W/m²
    Temperature dependence of sensitivity < 5 % (10... +40 °C)
    Tilt error (at 1000W/m²) < 1 %
    Spectral range 300...2800 nm
    Measuring range 2000 W/m²
    Altitude 0...60 °
    Measuring range 1400 W/m²


    Measurement range 0 ... 359°
    Resolution 1.0°
    Accuracy +/-10°
    Sampling rate 5 minutes


    Principle NTC
    Measuring range -50 ... 60 °C
    Unit °C
    Accuracy ±0.2 °C (-20...50 °C), otherwise ±0.5 °C (>-30 °C)

    Relative humidity

    Principle Capacitive
    Measuring range 0 ... 100 % RH
    Unit % RH
    Accuracy ±2 % RH

    Air pressure

    Principle MEMS capacitive
    Measuring range 300 ... 120