Apogee SN-500 4-Component Net Radiometer

Four-component measurement of net radiation with black-body pyranometers and pyrgeometers


  • 24-bit A to D converter
  • Digital SDI-12 Output
  • Separate measurements of each of the four components
  • Heated Sensors minimise errors caused by dew, frost, rain, or snow
  • Compact and Light Weight
  • Use with the AM-500 mounting bracket to facilitate precision leveling.
  • Comparable in accuracy to other four-component net radiometers, but lower cost.
  • Four year warranty


Typical Applications
Net radiation is a key variable in the surface energy balance and influences turbulent fluxes, including evapotranspiration. Applications include measurements on flux towers and weather stations.


Key Specifications:

Input Voltage: 5 -16 V DC (heaters are optimized to run at 12 V DC)
Current Draw (12V):
Heaters on, communication enabled: 63 mA;
Heaters off, communication enabled: 1.5 mA;
Heaters off, communication disabled: 0.6 mA
Response Time (SDI-12):
1 s
Operating Environment: -50 to 80 C; 0 to 100 %
Dimensions: 116 mm length, 45 mm width, 66 mm height
Cable M8 connector (IP67 rating) to interface to sensor housing; 5 m
Pyrgeometer Specifications  
Sensitivity 0.12 mV per W m-2 (typical)
Calibration Uncertainty ± 5 %
Output Range -24 to 24 mV
Measurement Repeatability Less than 1 %
Field of View 150°
Spectral Range 5 to 30 µm (50 % points)
Temperature Sensor 30 kΩ thermistor, ± 1 C tolerance at 25 C; 0 to 2500 mV typical output
Pyranometer Specifications  
Sensitivity 0.057 mV per W m-2 (upward-looking); 0.15 mV per W m-2 (downward-looking); (typical)
Calibration Uncertainty ± 5 %
Output Range 0 to 114 mV (upward-looking; 0 to 300 mV (downward-looking)
Measurement Range 0 to 2000 W m-2 (net shortwave irradiance)
Measurement Repeatability Less than 1 %
Field of View 180° (upward-looking); 150 ° (downward-looking)
Spectral Range 385 nm to 2105 nm (upward-looking); 295 nm to 2685 nm (downward-looking); (50 % points)
Directional (Cosine) Response Less than 20 W m-2 at 80° solar zenith


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