Key features


  • All-in-one housing concept of a compact weather sensor combining several measurement parameters in one housing with only one cable connection
  • First and only compact weather sensor with integrated Kipp & Zonen CMP10 Pyranometer with secondary standard quality
  • 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


The WS310-UMB Smart Weather Sensor for measuring of air temperature, relative humidity, solar radiation and air pressure. Relative humidity is measured by means of a capacitive sensor element; a precision NTC measuring element is used to measure air temperature. The world renowned technology of Kipp & Zonen CMP10 is integrated. Measurement output can be accessed by the following protocols: UMB-Binary, UMB-ASCII, SDI-12, MODBUS. One external temperature or rain sensor is connectable.

Lufft WS310-UMB

  • General

    Dimensions Ø approx. 150 mm, height approx. 332 mm
    Weight Approx. 1.5 kg
    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 40 VA (heater)
    Operating temperature -50...60 °C (with heater)
    Operating rel. humidity 0...100 % RH
    Cable length 10 m
    Protection level housing IP66
    Mast mounting suitable for Mast diameter 60 - 76 mm


    Principle NTC
    Measuring range -40 ... 80 °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 ... 1200 hPa
    Unit hPa
    Accuracy ±0.5 hPa (0...40 °C)


    Response time < 5 s
    Zero offset A < 7 W/m²
    Zero offset B < 2 W/m²
    Directional error (at 1000 W/m²) < 0.2 %
    Temperature dependence of sensitivity < 1 % (-10 ºC...40 ºC)
    Spectral range 285 to 2,800 nm
    Measuring range 4000 W/m²