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Precision Amplified Pyranometer
An ideal pyranometer measures the entire solar spectrum, 280 to 2800 nm. However, about 90% of sunlight energy is between 300 to 1100 nm. Models SP-212 & SP-215 is calibrated to estimate the shortwave energy from sunlight. Apogee pyranometers are calibrated under sunlight over a multiple day period to a heated and ventilated Kipp & Zonen model CM21 precision reference radiometer.
This sensor is a silicon-cell pyranometer. It is calibrated to measure total shortwave radiation. The evaporation of water from soil and the transpiration of water from plant leaves are partly determined by the intensity of shortwave radiation, which is measured in Joules m-2 s-1 or Watts m-2
45° zenith angle ± 1 %
75° zenith angle ± 4 %
ABSOLUTE ACCURACY ± 5 %
REPRODUCIBILITY ± 1 %
2.5 V option Output 0 to 2.5 V (2.2 V = full sunlight 1100 W m-2)
Input power 2.5 to 5.5 VDC
Sensitivity Custom calibrated to exactly 0.50 W m-2 per mV
5.0 V option Output 0 to 5 V (4.4 V = full sunlight 1100 W m-2)
Input power 5 to 5.5 VDC
Sensitivity Custom calibrated to exactly 0.25 W m-2/ mV
OPERATING ENVIRONMENT - 40 to 55 °C; 0 to 100% relative humidity.
Designed for continuous outdoor use. Can be submerged under water.
Current draw 285 μA
MATERIALS Anodised aluminium with acrylic lens
CABLE 3 meters of shielded, twisted-pair wire with Santoprene casing, ending in pigtail leads.
DIMENSIONS 2.4 cm diameter, 2.75 cm high
MASS 70 g (with 3 m lead wire)
Model SP-212 (2.5 V) Precision Amplified Pyranometer
Model SP-215 (5 V) Precision Amplified Pyranometer
Model AL-100: Leveling plate