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SP-230 Sunshine Sensor (heated)

SP-230

Apogee Instruments

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355,00 €

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The Sensor measures: Solar Light 360nm to 1120nm
Output Signal: mV
Cable Length: 5 meters
Power Supply: 12 V
Sensor for use in: Outdoor & Underwater

The new Apogee SP-230 All-Season Pyranometer is a game-changer in the measurement of solar radiation by finally eliminating the problem of snow, frost, and dew accumulating on the sensor—a problem that has been shown to drastically affect the accuracy of many radiometers all throughout the year (Malek, 2008).

We combined a tiny internal heater (0.18 Watt), a dome-shaped head, and an elevated base to keep the SP-230 tracking our expensive heated and ventilated reference pyranometer during the most severe weather—while using 1/80th the power.

The heater can be powered by a small solar panel and battery, even on short days at high latitudes. 

 

Malek, E., 2008. The daily and annual effects of dew, frost, and snow on anon-ventilated net radiometer. Atmospheric Research 89:243-251. 

 

 

Figure 1: Solar radiation after a January frost in Logan, Utah with overcast conditions until 11 a.m. The two replicate Apogee SP-230 pyranometers were nearly identical to a heated and ventilated reference pyranometer. In spite of the bright sunlight after 11 a.m., the frost on two unheated glass dome thermopile and four replicate unheated castle design pyranometers did not melt until after 4 p.m. (1600 hours).

Figure 1: Solar radiation after a January frost in Logan, Utah with overcast conditions until 11 a.m. The two replicate Apogee SP-230 pyranometers were nearly identical to a heated and ventilated reference pyranometer. In spite of the bright sunlight after 11 a.m., the frost on two unheated glass dome thermopile and four replicate unheated castle design pyranometers did not melt until after 4 p.m. (1600 hours).  
 

Figure 2. The effect of frost and snow accumulation for three groups of pyranometers in Logan UT, expressed as a percentage of true reading. Castle design and unheated thermopile sensors averaged a 20% error for the month with a maximum error of 80%. Data for Figure 1 is from day 12. 

Figure 2. The effect of frost and snow accumulation for three groups of pyranometers in Logan UT, expressed as a percentage of true reading. Castle design and unheated thermopile sensors averaged a 20% error for the month with a maximum error of 80%. Data for Figure 1 is from day 12.

 

Power Supply: 12 VDC with a nominal current draw of 15 mASensitivity: 0.20 mV per W m-2
Calibration Factor: 5.0 W m-2 per mV (reciprocal of sensitivity)
Calibration Uncertainty: ± 5 %
Measurement Repeatability: ± 1%
Non-stability (Long-term Drift): < 2 % per year
Non-linearity: < 1 % (up to 1750 W m-2)
Response Time: < 1 ms
Field of View: 180°
Spectral Range: 360 nm to 1120 nm (wavelengths where response is 10 % of maximum)
Directional (Cosine) Response: ± 5 % at 75° zenith angle
Temperature Response: -0.04 ± 0.04 % per C
Operating Environment: -40 to 70 C, 0 to 100 % relative humidity
Dimensions: 2.40 cm diameter and 2.75 cm height
Mass: 90 g (with 5 m of lead wire)
Warranty: 4 years

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