Overview
The Lufft family of multi-parameter weather sensors offer a cost-effective, compact alternative for the acquisition of a variety of measurement parameters on land- and buoy-based weather stations. Depending on the model, each Lufft weather sensor will measure a different combination of weather parameters to meet a wide variety of applications.

Air Temperature & Humidity
Temperature is measured using a highly accurate NTC-resistor, while humidity is measured using a capacitive humidity sensor. Both sensors are located in a ventilated radiation shield to reduce the effects of solar radiation.

Pressure
Absolute air pressure is measured using a built-in MEMS sensor. 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.

Wind Speed & Direction
The wind sensor uses four ultrasound sensors which take cyclical measurements in all directions. The resulting wind speed and direction are calculated from the measured run-time sound differential.

Compass
The integrated electronic compass can be used to check the north-south adjustment of the sensor housing for wind direction measurement. It is also used to calculate the compass-corrected wind direction.

Precipitation
Tried and tested radar technology is used to measure precipitation. The precipitation sensor works with a 24GHz Doppler radar, which measures the drop speed and calculates precipitation quantity and type by correlating drop size and speed.

LUFFT WS600 SPECIFICATIONS

Dimensions	Ø ca. 150mm, Height ca. 345mm, Weight approx. 1.5kg
Interface	RS 485 2-wire, half duplex
Operating power consumption	24 VDC +/- 10% < 4VA (without heating)
Operating humidity range	0...100%
Operating temperature range	-30...70°C
Temperature
Principle	NTC
Measuring range	-30...70°C
Accuracy	±0.2°C (-20°C...+50°C), otherwise ±0.5°C
Relative humidity
Principle	capacitive
Measuring range	0…100% RH
Accuracy	±2% RH
Precipitation intensity
Resolution	0.01mm
Measuring range drop size	0.3...5mm
Reproducibility	typ. >90%
Precipitation type	Rain/snow
Air Pressure
Principle	MEMS capacitive
Measuring range	300...1200 hPa
Accuracy	±1.5hPa
Wind direction
Principle	Ultrasonic
Measuring range	0...359.9°
Accuracy	±3°
Wind speed
Principle	Ultrasonic
Measuring range	0...60m/s
Accuracy	±0.3m/s or ±3% (0...35m/s)