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WS300-UMB Smart Weather Sensor

Make:  Lufft                                             Model:  WS300 UMB
✅ Compact all-in-one weather sensor, low power, aspirated radiation shield, maintenance-free operation, open communication protocol
✅ Measurand: Temperature, relative humidity, air pressure
✅ Principle Used: NTC/T, Capacitive/RH, MEMS capacitive/Pressure
✅ Signal Output: RS485 with supported protocols UMB-Binary, UMB-ASCII, Modbus-RTU, Modbus-ASCII, XDR and SDI-12
✅ Article number: 8372.U01

Compact all-in-one weather sensor for measurement of temperature, relative humidity and air pressure.

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 and air pressure. One external temperature or rain sensor is connectable.

Advantages of the Smart Weather Sensor WS300

  • All-in-one housing concept of a compact weather sensor combining several measurement parameters in one housing with only one cable connection
  • Built-in data pre-processing, universal interfaces and selectable output protocols
  • Compatible with many commercially available Met/HydroMet dataloggers and PLS systems thanks to an open communication protocol
  • Maintenance-free operation – no moving parts that can wear out
  • Suitable for all climate zones; also for solar-powered automatic meteorological stations
  • Ventilated temperature and humidity measurement according to WMO guidelines.

Applications of the Smart Weather Sensor WS300

The robust and maintenance-free smart weather sensor WS300 is designed for professional meteorological applications in all climate zones. It delivers reliable data, even in extreme ambient conditions.

  • Weather observation for road and traffic control systems
  • Automatic weather station / Automatic weather sensor (AWS)
  • PV-Monitoring / Solar Monitoring on photovoltaic farms
  • Hydro-meteorological stations
  • Weather observation for building automation
  • Weather stations at airports, marinas and onboard ships
  • Integration into various other systems/solutions, where environmental data is needed…







Ø approx. 150 mm, height approx. 223 mm


Approx. 1 kg


RS485, 2-wire, half-duplex

Power Supply

4…32 VDC, 5…11 VDC (electronics with limited precision of measurements) , 24 VDC +/- 10% (heater)

Power Consumption

135mA at 24VDC, resulting in a power of approx. 3.25W

Operating Temperature

-50…60°C (with heater)

Operating Rel. Humidity

0…100% RH

Cable Length

10 m

Protection level housing



Compliant to IEC 61724-1:2017

Mast mounting suitable for

Mast diameter 60 – 76 mm

Air Temperature

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 … 1200 hPa
Unit: hPa
Accuracy: ±0.5 hPa (0…40 °C)