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SN-500-SS: Net Radiometer

Make:  Apogee     Model: SN-500-SS
✅ Onboard A/D Conversion and Modbus Output
✅ Four-component Net Radiometer
✅ Individually Heated Radiometers
✅ Compact and Light Weight

Apogee Instruments’ new four-component net radiometer provides individual measurement of net radiation components. The sensor features an SDI-12 output, eliminating the need for multiple analog channels to measure the individual components of net radiation. The net radiometer comes as a complete package that includes net radiometer, mounting rod, pigtail lead cable for datalogger interface, and carrying case.

Onboard A/D Conversion and SDI-12 Output
Apogee net radiometers feature onboard A/D conversion and SDI-12 output to eliminate the requirement of multiple analog datalogger channels.

Four-component Net Radiometer
An upward-looking and downward-looking pyranometer, and an upward-looking and downward-looking pyrgeometer provide separate measurements of the four components of net radiation.

Individually Heated Radiometers
Each radiometer includes an individual heater to increase accuracy by minimizing the influence of dew/frost on the filter.

Compact and Light Weight
Designed to be light weight and small in size to facilitate easy mounting.

Key Points:

  • Net radiation is a key variable in the surface energy balance and influences turbulent fluxes, including evapotranspiration.
  • It include measurements on flux towers and weather stations.
  • An on-board 24-bit analog to digital converter makes measurements and provides a digital SDI-12 (SN-500) or Modbus (SN-522) output.
  • This eliminates the need for multiple analog datalogger channels to measure each of the four components of net radiation.
  • Measure all four components of net radiation with a digital output that saves datalogger channels.
  • Comparable accuracy to industry leading competition in long-term field testing.
  • The small lightweight design enables easy mounting to a cross arm using the AM-500 mounting bracket that facilitates precision leveling.
  • Each sensor includes a 0.2 W heater to minimize errors from dew, frost, rain, and snow that can block the radiation path.




General Specification


Weight (Mass)

320 g (with mounting rod and 5 m of lead wire)


116 mm length, 45 mm width, 66 mm height


Output Type: SDI-12

Power Supply

Supply Voltage: 12 V DC Supply Voltage
Current Draw : Heaters on, communication enabled: 63 mA ;Heaters off, communication enabled: 1.5 mA;Heaters off, communication disabled: 0.6 mA
Input Voltage Range: 5.5 to 24 V DC (heaters are optimized to run at 12 V DC)

Response Time

1 s (SDI-12 data transfer rate; detector response times are 0.5 sec)

Operating Environment

-50 to 80 C; 0 to 100 % relative humidity


4 years against defects in materials and workmanship


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