Present Weather/Precipitation Identification Sensor Model 6490

The Model 6490 Present Weather Sensor optically measures precipitation induced scintillation and applies algorithms to automatically determine the precipitation occurrence, type, and rate. The Model 6490 is vastly superior to traditional type sensors, and offers reliability and proven performance.The Model 6490 measures precipitation by detecting the optical irregularitiesknown as scintillationsinduced by particles falling through a beam of partially coherent infrared light (in the sample volume).By detecting the intensity of the scintillations characteristic of precipitation, the precipitation rate is determined, allowing it to be used as a precipitation accumulation sensor.By analyzing the frequency spectrum of the induced scintillation, the precipitation type is determined.By adding an optional Hail and Ice Pellet Sensor (HIPS), hail and ice pellets can also be detected. Precipitation is measured using the sensor head "in-beam" optics.An optional rechargeable backup battery kit (housed in the Model 1190 DCP) is available to power the sensor in the event of AC power failure.Designed for rugged, unattended operation, the Model 6490 provides accurate measurement of precipitation in all weather conditions.Precipitation types detected include:Drizzle (light, moderate, and heavy) Rain (light, moderate, and heavy) Snow (light, moderate, and heavy) Precipitation (light, moderate, and heavy) Freezing rain Freezing drizzle