Using the Hukseflux NR01 Net Radiometer in Biomet Systems

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The Hukseflux NR01 Net Radiometer (part number 7900-146) measures incoming (downwelling) and reflected (upwelling) radiation in two spectral bands. The NR01 is supported by the Standard package. Be sure to read the manufacturer's instructions before using the NR01.

Siting the net radiometer

Install the net radiometer so its view is unobstructed by adjacent structures, trees, and the meteorological station. Select a location that is away from heat sources. Orient the sensor with the sensing element pointing toward the equator to minimize shading from surrounding elements. Mount the sensor at least 1.5 m above the plant canopy.

Mounting the net radiometer

Mount the radiometer perpendicular to the cross-arm using a cross-over fitting in accordance with the instructions from the manufacturer. Orient the net radiometer boom toward the equator to ensure that it is not covered by a shadow of other things on the tower.

Tighten the pins securely.

Wiring the net radiometer

The NR01 is supported by the Standard program and custom programs. The following schematic and table show wiring for the standard program.

Cable Description Wire Color Terminal
Net Radiation Upper Pyranometer + Red A7
Upper Pyranometer - Blue A8
Ground Black G4
Lower Pyranometer + White A9
Lower Pyranometer - Green A10
Upper Pyrgeometer + Brown A11
Upper Pyrgeometer - Yellow A12
Lower Pyrgeometer + Pink A13
Lower Pyrgeometer - Gray A14
Temperature Ground Black G6
Thermistor + Red A15
Thermistor + White A15
Thermistor - Blue G7
Thermistor - Green G7
Heater Ground Yellow GND
Heater Power Brown SW1

Retrieving Data

The SmartFlux System will log these data in compressed files for processing by EddyPro Software and evaluation by Tovi Software. Data are stored on the USB drive on the SmartFlux System. Refer to the Data Acquisition System instruction manual for details.


The probe is a low maintenance sensor and little care is required as long as the sensor is performing as expected. If the sensor is providing questionable data:

  • Check the connections to the datalogger and ensure that they are correct and secure.
  • Check the cables for damage.
  • Ensure that the datalogger has an adequate power supply.