Apogee Instruments SP-230-SS Manual do Proprietário - Página 15
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Spectral Errors for Shortwave Radiation Measurements with Apogee SP Series Pyranometers
Radiation Source (Error Calculated Relative to Sun, Clear Sky)
Sun (Clear Sky)
Sun (Cloudy Sky)
Reflected from Grass Canopy
Reflected from Deciduous Canopy
Reflected from Conifer Canopy
Reflected from Agricultural Soil
Reflected from Forest Soil
Reflected from Desert Soil
Reflected from Water
Reflected from Ice
Reflected from Snow
Operation of Heater (SP-230)
Apogee model SP-230 pyranometers have an internal heater to allow for sensor heating during precipitation
events or under conditions of dew, frost, and snow deposition. The heater is designed to keep the water (liquid
and frozen) off the diffuser, though it does not need to be used in order to make measurements of shortwave
radiation. However, if the diffuser has water on the surface, errors can result. Continuously powering the heater
under conditions that do not require heating will not damage the sensor or influence measurements.
Spectral error for Apogee SP series
pyranometers as a function of
atmospheric air mass, assuming
calibration at an air mass of 1.5.
Error [%]
0.0
9.6
14.6
16.0
19.2
-12.1
-4.1
3.0
6.6
0.3
13.7