Lufft WS301 Compact Weather Station

Lufft WS301 Compact Weather Sensor

The WS301 accurately measures:
  • Air temperature
  • Relative humidity
  • Air pressure
  • Radiation (solar irradiance with pyranometer)
  • Serial Output – RS485 Modbus or SDI-12
  • Low power consumption
  • Integrated heater
  • Aspirated radiation shield
  • Optional remote temperature probe


Lufft WS301 all-in-one compact weather station

The Lufft WS301 is ideal for measuring air temperature, relative humidity, solar irradiance, and air pressure. It is suitable for high-end applications where accuracy and build quality cannot be compromised.

For solar radiation measurements, the Lufft WS301 is equipped with a Kipp and Zonen CMP pyranometer with thermopile sensors. A superior category of the sensor compared to silicon sensor pyranometers.

The sensors are protected by a radiation shell for protection and to ensure measurement accuracy, making the WS301 compliant according to WMO guidelines.

The WS301 is suitable for all climates, with a temperature range of -50 to +60 °C. There are no moving parts and data processing is built-in. This makes the WS301 incredibly robust and easy to use.

As standard, we supply the Lufft WS301 with Modbus communications. However, it is possible to supply the sensor with SDI-12. Please let us know at the time of ordering which you would prefer.

As with all WS series compact weather sensors, it is possible to fit a temperature probe. The probe measures surface temperature and is ideal for the PV solar sector to measure the back of panel temperature.

Dimensions Ø approx. 150 mm, height approx. 268 mm
Weight Approx 1.3kg
Interface  RS485, 2 – wire, half – duplex
Power supply  4 to 32 VDC
Power supply   5 to 11 VDC (electronics with limited precision of measurements)
Power supply  24 VDC +/- 10%
Power consumption  135mA at 24VDC, resulting in a power of approx. 3.25W
Operating temperature   -50 to 60 °C
Operating rel. humidity   0 to 100 % RH
Cable length  10 m
Protection level housing  IP66
Standards/Regulations  No information available
Mast mounting  Suitable for mast diameter 60 – 76 mm
Principle  NTC
Measuring range   -50 to 60 °C
Unit  °C
Accuracy  ±0.2 °C (-20…50 °C), otherwise ±0.5 °C (>-30 °C)
Relative humidity
Principle  Capacitive
Measuring range  0 to  100 % RH
Unit  % RH
Accuracy  ±2 % RH
Air pressure
Principle  MEMS capacitive
Measuring range   300 to 1200 hPa
Unit  hPa
Accuracy  ±0.5 hPa (0 to 40 °C)
Radiation (CMP3 Pyranometer)
Unit W/m²
Response time (95%) < 18 s
Non-stability(change/year) < 1 %
Non-linearity (0 to 1000 W/m²) < 1 %
Directional error (at 80° with 1000 W/m²) < 20 W/m²
Temperature dependence of sensitivity < 5 % (-10 to +40 °C)
Tilt error (at 1000 W/m²) < 1 %
Spectral range 300…2800 nm
Measuring range 2000 W/m²
Altitude 0…60 ° Azimuth

WS Series Frequently asked questions.

How do I mount my WS sensors? 

The sensor can be mounted directly onto a 60mm diameter pole. The sensors come with ‘U’ mounting brackets. A mounting arm (which can attach to 40-80mm diameter poles) can be supplied too.

Are other communications protocols possible?

Possible interfaces are RS485 with supported protocols UMB-Binary, UMB-ASCII, Modbus-RTU, Modbus-ASCII, XDR, and SDI-12.

What data logger is the WS301 compatible with?

The W300 is compatible with many commercially available Met/HydroMet dataloggers and PLS systems thanks to an open communication protocol.


Optional Extras:
  • External temperature probe (can be used as a back of module temperature sensor)
  • Rain gauge Lufft WTB100