SPECIFICATIONS
Calibration Traceability
Apogee Instruments SP-500 series pyranometers are calibrated through side-by-side comparison to the mean of
four transfer standard pyranometers (shortwave radiation reference) under high intensity discharge metal halide
lamps. The transfer standard pyranometers are calibrated through side-by-side comparison to the mean of at least
two ISO-classified reference pyranometers under sunlight (clear sky conditions) in Logan, Utah. Each of four ISO-
classified reference pyranometers are recalibrated on an alternating year schedule (two instruments each year) at
the National Renewable Energy Laboratory (NREL) in Golden, Colorado. NREL reference standards are calibrated to
the World Radiometric Reference (WRR) in Davos, Switzerland.
SP-522
ISO 9060:2018
Class C (previously known as
second class
)
Input Voltage Requirement
5.5 to 24 V
Average Max Current Draw
4 mA (heater off)
30 mA (heater on)
Calibration Uncertainty at
1000 W m
-2
Less than 3 % (see Calibration Traceability below)
Measurement Repeatability
Less than 1 %
Long-term Drift
(Non-stability)
Less than 2 % per year
Non-linearity
Less than 1 % (up to 2000 W m
-2
)
Field of View
180°
Spectral Range
385 to 2105 nm (wavelengths where response is 50 % of maximum)
Directional (Cosine)
Response
Less than 30 W m⁻² at 80° solar zenith
Temperature Response
Less than 5 % from -15 to 45 C
Zero Offset A
Less than 5
W m⁻²; Less than 10 W m⁻² (heated)
Zero Offset B
Less than 5
W m⁻²
Operating Environment
-50 to 80 C; 0 to 100 % relative humidity; can be submerged in water up to 30 m
Dimensions
30.5 diameter, 37 mm height
Mass (with 5 m of cable)
140 g
Cable
5 m of four conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; stainless
steel (316), M8 connector
Содержание SP-522
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