WEATHER STATION 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 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. Features : All in One Aspirated temperature/humidity measurement Maintenance-free operation Open communication protocol UMB-ASCII UMB-Binary SDI-12 MODBUS Analog outputs in combination with 8160.UDAC. Includes : WS600 Multi-Parameter Weather Sensor 10m sensor cable Operations manual. Specifications : Air Temperature Principle: NTC Measuring Range: -50 to +60 C  Resolution: 0.1 C (-20 to +50 C); otherwise 0.2 C  Accuracy: +/-0.2 C (-20 to +50 C); otherwise +/-0.5 C Units: C; F. Humidity    Principle: Capacitive Measuring Range: 0 to 100% RH Resolution: 0.1% RH Accuracy: +/-2% RH Units: % RH; g/m3; g/kg. Pressure  Principle: Capacitive  Measuring Range: 300 to 1200hPa  Resolution: 0.1hPa  Accuracy: +/-1.5hPa  Unit: hPa. Wind Speed Principle: Ultrasonic Measuring Range: 0 to 60m/s Resolution: 0.1m/s Accuracy: +/-0.3m/s or 3% (0 to 35m/s); +/-5% (>35m/s) Response Threshold: 0.3m/s Units: m/s; km/h; mph; kts. Wind Direction  Principle: Ultrasonic  Measuring Range: 0 to 359.9 degrees  Resolution: 0.1 degrees  Accuracy: +/-3 degrees  Response Threshold: 0.3m/s  Compass  Principle: Integrated Electronic Compass  Measuring Range: 0 to 359.9 degrees  Resolution: 1.0 degree. Precipitation  Principle: Radar  Measuring Range: 0.3mm to 5.0mm  Liquid Precipitation Resolution: 0.01mm  Precipitation Types: Rain, Snow  Repeatability: Typically> 90%  Response Threshold: 0.01mm. Technical Data  Interface: SDI-12, Modbus  Operating Temperature: -50 to +60 C  Operating Humidity: 0 to 100% RH  Included Cable Length: 10m.