 Present
Weather/Precipitation Identification Sensor Model 6490
General Description
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 irregularities—known
as scintillations—induced 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
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