Davis - UV Spectrum Sensor Specification Sheets

6490UV Sensor[extremely high]) plus 0.5 UV Index per 100' (30 m) of additional cableCosine Response . . . . . . . . . . . . . . . . . . . . . . . . . . ±4% (0× to 65× incident angle); 9% (65× to 85× incident angle)v. G, 11/29/10)DS6490 (ReVantage Pro2TM AccessoriesThe UV Sensor measures the sunburning portion of the UV spectrum. Its spectral response matches very closely the Erythema Action Spectrum (EAS), defined by McKinlay and Diffey (1987) and adopted by the Commission Internationale de l’Eclairage (C.I.E.) as the standard representation of the human skin’s sensitivity to UV radiation. The sensor measures global solar UV irradiance, the sum of the components of solar UV transmitted directly and those scattered in the atmosphere. Scattered UV is a major portion of global irradiance.The transducer is a semiconductor photodiode that responds only to radiation in the region of interest. The diffuser provides an excellent cosine response. With multiple hard-oxide coatings, the interference filter provides the Erythema Action spectral response. It is stable in the presence of heat and humidity. The outer shell shields the sensor from thermal radiation and provides a path for convection cooling of the body, minimizing heating of the sensor interior. It provides a cutoff ring for cosine response, a level indicator, and fins to aid in aligning the sensor with the sun’s rays. Spring-loaded mounting screws, in conjunction with the level indicator, enable rapid and accurate levelling of the sensor. Each sensor is calibrated against a Yankee Environmental Systems’ Ultraviolet Pyranometer, model UVB-1, in natural summer daylight.The UV Sensor is optional on Vantage Pro2 weather stations. It is standard on the Vantage Pro2 Plus.Please refer to the WeatherLink® for Vantage Pro® and Vantage Pro2™ specification sheet for optional data logging and charting capabilities available for this product.Genera lOperating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150° F (-40° to +65° C)Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . -50° to +158°F (-45° to +70°C)Transducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Semiconductor photodiodeSpectral Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280 to 360 nm (Erythema Action Spectrum)Cosine Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4% of reading (0° to 65° incident angle); ±9% of reading (65° to 85° incident angle)Supplied Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . 2' (0.6 m)Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-conductor, 26 AWGConnector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular RJ-11I/O SpecsGreen wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output (0 to 2.5VDC); 150 mV per UV Index, 364 mV per MED/hourBlack & Red wires . . . . . . . . . . . . . . . . . . . . . . . . . . GroundYellow wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3V ±10%, 2.4 mAHousing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UV-resistant ABS plasticDimensions (length x width x height) . . . . . . . . . . . . . . . . 2” x 2.75” x 2.25” (51 mm x 70 mm x 57 mm)Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 lbs. (226 g)Sensor OutputUltra Violet (UV) Radiation DoseResolution and Units . . . . . . . . . . . . . . . . . . . . . . . . 0.1 MEDs to 19.9 MEDs; 1 MED above 19.9 MEDSRange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 199 MEDsAccuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5% of daily totalDrift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . up to ±2% per yearUpdate Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds to 1 minute (5 minutes when dark)Ultra Violet (UV) Radiation IndexResolution and Units . . . . . . . . . . . . . . . . . . . . . . . . 0.1 IndexRange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 16 IndexAccuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5% of full scale (Reference: Yankee UVB-1 at UV Index of 10 12 Vantage Pro2TM AccessoriesUpdate Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds to 1 minute (5 minutes when dark)Cosine and Spectra l Responses ( typ ica l )Connect ionsPackage DimensionsProduct #Package Dimensions(Length x Width x Height)Package Weight UPC Codes6490 6.00" x 4.25" x 3.25" (153 mm x 108 mm x 83 mm) 16 oz. (.5 kg) 011698 00243 6AmplifierGroundOutput+3VRedBlackGreenYellow510) 732-9229 • FAX (510) 670-0589 • sales@davisnet .com • www.davisnet .com3465 Diablo Ave., Hayward, CA 94545-2778 USA®(510) 732-9229 • FAX (510) 670-0589 • sa les@davisnet .com • www.davisnet .com UV Sensor