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SN-522-SS Net Radiometer

Make: Apogee                                      Model: SN-522-SS
✅ The sensor features a Modbus RS-232 or RS-485 output, eliminating the need for multiple analog channels to measure the individual components of net radiation.
✅ Measurand :  Net Radiometer.
✅ Sensor Type : Themophile Sensor
✅ Signal Output : Modbus
✅ Supplied with : 5 m of lead wire cable, Factory test/ Calibration Certificates, Factory test/ Calibration Certificates.

SN-522-SS Net Radiometer:

Net radiation is the sum of the four components shown to the left (incoming shortwave, outgoing shortwave, incoming longwave, outgoing longwave). Incoming shortwave incident on the surface is either reflected or absorbed by the surface material, and longwave radiation is emitted from the surface and emitted from the molecules of air in the atmosphere. Typical clear sky summer fluxes over grass and clear sky winter fluxes over snow are shown. A typical summer flux at solar noon would be +650 W m⁻²; in winter it would be 0 W m⁻².

Apogee Instruments‘ new four-component net radiometer provides an individual measurement of net radiation components. The sensor features a Modbus RS-232 or RS-485 output, eliminating the need for multiple analog channels to measure the individual components of net radiation. The net radiometer comes in a complete package that includes the net radiometer, mounting rod, pigtail lead cable for the datalogger interface, and carrying case.


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.


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 industryleading competition in long-term field testing.

Onboard A/D Conversion and Modbus Output
Apogee Net radiometers feature onboard A/D conversion and Modbus output to eliminate the requirement for 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 lightweight and compact in order to facilitate easy installation

Application and features of SN-522-SS Net Radiometer:



✅ Solar PV Plant
✅ Climate change monitoring
✅ Weather Research
✅ Measurement of energy balance
✅ Digital Output
✅ High Accuracy
✅ Compact & Light Weight
✅ Heated Sensors




General Specification


Weight (Mass)

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


116 mm length, 45 mm width, 66 mm height



Power Supply

Current Draw (12 V DC Supply Voltage) Heaters on: 72 mA; Heaters off: 13.5 mA
Input Voltage Range: 5.5 to 24 V DC (heaters are optimized to run at 12 V DC)

Response Time

It takes 750 ms to digitize all detector signals

Operating Environment

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


4 years against defects in materials and workmanship


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