NR01-L 4-Component Net Radiometer
Research Grade
Robust 4-way radiometer that requires little maintenance
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The NR01, manufactured by Hukseflux, is a research-grade net radiometer that measures the energy balance between incoming short-wave and long-wave infrared radiation versus surface-reflected short-wave and outgoing long-wave infrared radiation. Our dataloggers measure the NR01's output and control its internal heater. This net radiometer offers a professional solution for scientific-grade energy balance studies.

Note: NR01 radiometers with a serial number less than 2313 used the pn 21271 fitting. NR01 radiometers with a serial number greater than 2312 do not need the pn 21271 fitting. 

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Benefits and Features

  • Internal RTD provides temperature compensation of measurements
  • Research-grade performance
  • Internal 1-W heater reduces formation of dew and melts frost
  • Separate outputs of short-wave and long-wave infrared radiation for better accuracy and more thorough quality assurance
  • Robust—only requiring limited maintenance


Detailed Description

The NR01 consists of a pyranometer and pyrgeometer pair that faces upward and a complementary pair that faces downward. The pyranometers and pyrgeometers measure short-wave and far infrared radiation, respectively.

The NR01 includes an on-board RTD to measure the radiometer’s internal temperature and a 1-W heater that minimizes the formation of dew and melts frost. To reduce current drain, a relay is typically used to turn on the heater only when the solar radiation is less than 20 W/m2.

Campbell Scientific's CR3000 and CR5000 dataloggers are ideal for measuring this radiometer. A CR1000 can also be used, but a 4WPB100 module is required to measure the internal RTD.


Sensor Hukseflux’s SR01 ISO-class, thermopile pyranometers, IR01 pyrgeometers, PT100 RTD
Measurement Description Measures incoming and outgoing short-wave and long-wave radiation
Response Time 18 s
Sensitivity 10 to 40 μV W-1 m2
Expected Output Range -0.1 to +50 mV
Expected Accuracy for Daily Totals ±10%
Heater 90 ohm, 1.6 W (at 12 Vdc)
Operating Temperature Range -40° to +80°C
Heater Current Drain ~140 mA
Dimensions 26.3 x 11.3 x 12.1 cm (10.4 x 4.4 x 4.8 in.)
  • 1.3 kg (2.9 lb) with 5 m (16.4 ft) cable
  • 0.9 kg (2 lb) sensor only


Spectral Range 305 to 2800 nm


Spectral Range 4500 to 50,000 nm


Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.


Product Compatible Note
CR1000 (retired) A 4WPB100 PRT Bridge Module is required to measure the internal RTD.
CR1000X A 4WPB100 PRT Bridge Module is required to measure the internal RTD.
CR3000 (retired)
CR800 (retired)
CR850 (retired)

Mounting Equipment

Product Compatible Note

Additional Compatibility Information


To avoid shading or reflections and to promote spatial averaging, the NR01 should be mounted at least 1.5 m above the ground or crop canopy and away from all obstructions or reflective surfaces that might adversely affect the measurement. Campbell Scientific recommends mounting the NR01 to a CM300-series mounting pole at least 25 feet away from other mounting structures. The NR01 is attached to the CM300-series mounting pole via a CM204 or CM206 crossarm.


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