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WS800-UMB Smart Weather Sensor

Make:  Lufft                             Model: WS800 UMB
✅ Wind detection with birdproof construction. First and only compact all-in-one weather sensor with lightning detection, low power, heater, aspirated radiation  shield, maintenance-free operation, open communication protocol.
✅ Measurand: Temperature, Relative humidity, Air pressure, Wind direction, Wind speed, Precipitation intensity, Precipitation quantity, Solar radiation, Lightning strikes
✅ Sensor Type: Compact Weather sensor
✅ Signal Output: RS485 with supported protocols UMB-Binary, UMB-ASCII, Modbus-RTU, Modbus-ASCII, XDR and SDI-12
✅ Supplied With: 10 Meter standerd cable, Factory test/ Calibration certificate
✅ Article number: 8381.U01, 8381.U01-NA

WS800-UMB Smart Weather Sensor:

From the WS product family of professional intelligent measurement transducers with digital interfaces for environmental applications. integrated design with ventilated radiation protection for measuring: air temperature, relative humidity, precipitation intensity, precipitation type, precipitation quantity, solar radiation, lightning detection, air pressure, wind direction, and wind speed. One external temperature sensor is connectable.

Air Temperature and Humidity: Temperature is measured by way of a highly accurate NTC resistor, while humidity is measured using a capacitive humidity sensor. In order to keep the effects of external influences (e.g., solar radiation) as low as possible, these sensors are located in a ventilated housing with radiation protection. In contrast to conventional, non-ventilated sensors, this allows significantly more accurate measurement during high radiation conditions. Air temperature values with reduced accuracy are available as service channels for additional information. Additional variables such as dewpoint, absolute humidity, and mixing ratio are calculated from air temperature and relative humidity, taking air pressure into account.

Air Pressure: Absolute air pressure is measured by way of a built-in sensor (MEMS). The relative air pressure referenced to sea level is calculated using the barometric formula with the aid of the local altitude, which is user-configurable on the equipment.

Precipitation: Tried and tested radar technology from the R2S-UMB sensor is used to measure precipitation. The precipitation sensor works with a 24 GHz Doppler radar, which measures the drop speed and calculates precipitation quantity and type by correlating drop size and speed. The WS601-UMB is using an unheated rain gauge for precipitation measurement. This version can be recommended for low-power applications, etc.

Wind: The wind meter uses four ultrasonic sensors that take cyclical measurements in all directions. The resulting wind speed and direction are calculated from the measured run-time sound differential. The sensor delivers a quality output signal indicating how many good readings were taken during the measurement interval.

Global Radiation: The global radiation is measured by a pyranometer mounted on the top cover of the Smart Weather Sensor.

Application and features of WS800-UMB Smart Weather Sensor:



✅ 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
✅ Measuring wind direction and speed is susceptible to bird nesting thanks to roofed construction.
✅ The first and only all-in-one compact weather sensor with lightning detection.
✅ All-in-one housing design for a compact weather sensor that combines multiple measurement parameters in a single 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 and also for solar-powered automatic meteorological stations
✅ Integrated heater that can be switched on if there is danger of frost.





Ø approx. 150 mm, height approx. 317 mm

Weight (Mass)

Approx. 1.5 kg


RS485, 2 – wire, half – duplex

Power Supply

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

Operating Environment

Operating Temperature: -50…+60°C (with heater), Operating Rel. Humidity: 0…100% RH

Cable Length

10 m

Protection Level



Compliant to IEC 61724-1:2017 Class C

Mast diameter

60 – 76 mm

Lightning Detection

Number of lightning events
Coverage area: 5 – 10 km

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)

Wind Direction

Principle: Ultrasonic
Measuring range: 0 … 359.9 °
Unit: °
Accuracy: < 3° RMSE > 1.0 m/s
Resolution: 0.1

Wind Speed

Principle: Ultrasonic
Measuring range: 0 … 75 m/s
Unit: m/s
Accuracy: ±0.3 m/s or ±3 % (0…35 m/s) ±5 % (>35 m/s) RMS
Resolution: 0.1

Precipitation (liquid)

Droplet Size: 0,3 … 5 mm
Detection Sensitivity 0,01 mm/h
Particle Velocity 0.9 … 15.5 m/s
Precipitation Types: Rain/ Snow
Solid precipitation: 5.1 … ~30 mm
Intensity Range: 0…200mm/h
Intensity Resolution: 0.01 mm/h
Amount Resolution: 0.1 mm
Accuracy: 20 % under laborary conditions
Reproducibility: Typical >90 % under laborary conditions

Solar Radiation

Unit: W/m²
Accuracy: 5%
Response time: (95%) < 1s
Spectral range: 300 to 1100 nm
Measuring range: 1400 W/m²

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