CNR4-L 4-Component Net Radiometer

The CNR4 consists of a pyranometer and pyrgeometer pair that faces upward and a complementary pair that faces downward. The pyranometers and pyrgeometers measure shortwave and long-wave infrared radiation, respectively. 

The upper long-wave detector of the CNR4 has a meniscus dome that allows water droplets to easily roll off of it. The dome shape also increases the field of view to nearly 180° instead of 150° for a flat window. 

The CNR4 contains both an internal thermistor and an internal Pt-100 RTD. Typically, the thermistor makes the instrument housing temperature measurements used to compensate the infrared readings. Alternatively, the RTD can provide these measurements if a CR3000 or CR5000 datalogger is used. 

Benefits and Features 

• • Research-grade performance 
  • Meniscus dome on upper long-wave detector allows water droplets to easily roll off of it and increases field of view to nearly 180° 
  • Internal temperature sensors provide temperature compensation of measurements 
  • Drying cartridge helps keep the electronics dry 
  • Compatible with the CNF4 ventilation unit with heater that 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 
  • Solar shield reduces thermal effects on the sensors