• UV Sensor
DA6490-000

UV Sensor


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The 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.

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 secondary standard that is calibrated periodically against a Yankee Environmental Systems’ Ultraviolet Pyranometer, model UVB-1, in natural daylight.

The UV Sensor is optional on Vantage Pro weather stations. It is standard on the Vantage Pro Plus. Please refer to the WeatherLink for Vantage Pro Spec Sheet for optional data logging and charting capabilities available for this product.

SPECIFICATIONS

General
Operating Temp.-40° to +150° F (-40° to +65° C)
Non-operating Temp.-50° to +158°F (-45° to +70°C)
TransducerSemiconductor photodiode
Spectral Response280 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 Length3’ (0.9 m)
Cable Type4-conductor, 26 AWG
ConnectorModular RJ-11
I/O SpecsGreen wireOutput (0 to 2.5VDC); 150 mV per UV Index, 364 mV per MED/hour
Black & Red wiresGround
Yellow wire+3V ±10%, 2.4 mA
Housing MaterialUV-resistant ABS plastic
Dimensions2” x 2.75” x 2.25” (51 mm x 70 mm x 57 mm)
Weight0.5 lbs. (226 g)
Sensor Output
Ultra Violet (UV) Radiation Index
Resolution and Units0.1 Index
Range0 to 16 Index
Accuracy±5% of full scale (Reference: Yankee UVB-1 at UV Index of 10 (extremely high)) plus 0.5 UV Index per 100’ (30 m) of additional cable
Cosine Reponse±4% (0° to 65° incident angle); 9% (65° to 85° incident angle)
Update Interval50 seconds to 1 minute (5 minutes when dark)
Current DataInstant Reading and Hourly Average; Daily, Monthly High
Historical DataHourly Average, Daily, Monthly Highs
AlarmHigh Threshold from Instant Calculation
Ultra Violet (UV) Radiation Dose
Resolution and Units0.1 MEDs to 19.9 MEDs; 1 MED above 19.9 MEDS
Range0 to 199 MEDs
Accuracy±5% of daily total
Driftup to ±2% per year
Update Interval50 seconds to 1 minute (5 minutes when dark)
Current DataLatest Daily Total (user resetable at any time from Current Screen)
Historical DataHourly, Daily Totals (user reset from Current Screen does not affect these values)
AlarmHigh Threshold from Daily Total
Alarm Range0 to 19.9 MEDs

 

CAT. NO.DESCRIPTION
DA6490-000UV sensor, Model 6490