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CNR2-L Long- and Short-Wave Net Radiometer
Services Available
Repair No
Free Support No


The CNR2 is a 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. It is directly connected to a Campbell Scientific data logger and is ideal for use in field studies.

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Benefits and Features

  • Separate outputs for short- and long-wave radiation
  • Compatible with most Campbell Scientific data loggers
  • Integrated bubble level ensures proper installation
  • Replaceable drying cartridge prevents internal condensation
  • Glass domes and silicon windows protect the two differential thermopile detectors from environmental factors


Detailed Description

The CNR2 Net Radiometer consists of a pyranometer and pyrgeometer pair that face upward and a complementary pair that face downward. The pyranometers and pyrgeometers measure short-wave and far infrared radiation, respectively. Field-of-view is 180 degrees for the upper pyranometer, and 150 degrees for the lower pyranometer. Both upper and lower pyrgeometers provide a 150 degree field-of-view.

Glass domes and silicon windows protect the sensors from environmental factors, minimize the effects of wind and rain on measurements, and are easy to clean. Replaceable drying cartridges prevent condensation on the sensors.

The CNR2 outputs a millivolt signal that our data loggers measure.


Pyranometer Spectral Range 310 to 2800 nm
Pyrgeometer Spectral Range 4.5 to 42 μm
Response Time < 10 s
Temperature Dependence of Sensitivity < 5% (-10° to +40ºC)
Sensitivity Range 10 to 20 μV W-1 m2
Pyranometer Output Range 0 to 50 mV
Pyrgeometer Output Range ±5 mV
Sensitivity Change < 1% (per year)
Tilt Error < 1%
Uncertainty in Daily Total < 10%
Sensor Asymmetry < 5%
Directional Error < 20 W m-2 (pyranometer)
Operating Temperature -40° to +80°C
CE Compliance Conforms to the CE guideline 89/336/EEC 73/23/EEC.
Dome Diameter 1.5 cm (0.6 in.)
Length 19.5 cm (7.7 in.)
Weight 250 g (8.8 oz) without cable
Cable Weight 300 g (10.6 oz) with 9.1-m (30-ft) length


Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR3000 (retired)
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR800 (retired)
CR850 (retired)
CR9000 (retired)
CR9000X (retired)

Additional Compatibility Information


To avoid shading and to promote spatial averaging, the CNR2 should be mounted at least 1.5 m above the ground and away from obstructions. It can be attached to a vertical pipe or horizontal crossarm (CM202, CM204, or CM206). To do this, first connect the radiometer to the 26127 Mounting Boom. The mounting boom then attaches to the pipe or crossarm via the 26120 Net Radiation Sensor Mounting Kit. The kit includes adjustment screws for leveling the CNR2. Sensitivity is reduced when the radiometer is not level (see tilt-error in specifications).

The 26127 Mounting Boom began shipping with the CNR2 in January 2010. If you purchased the radiometer before January 2010 or bought it directly from Kipp & Zonen, you need to purchase the 26127 Mounting Boom from Campbell Scientific in order to mount the CNR2 to a crossarm or pole via the 26120 mounting kit.


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