CNR4 Net Radiometer

The CNR4 net radiometer is manufactured by Kipp & Zonen for applications requiring research-grade performance. It replaces the CNR1. The radiometer measures the energy balance between incoming short-wave and long-wave IR radiation versus surface-reflected short-wave and outgoing long-wave IR radiation. The CNR4 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. All four sensors are calibrated to an identical sensitivity coefficient.



  • Separate outputs of short wave and long wave infrared radiation for better accuracy and more thorough quality assurance
  • Ideal for research-grade solar radiation measurements
  • Consists of two pyranometers to measure short-wave radiation and two pyrgeometers to measure infrared radiation
  • Includes RTD to measure internal temperature
  • Compatible with the CNF4 ventilation unit with heater that reduces formation of dew and melts frost


  • Spectral response: 305 to 2800 nm (pyranometer), 4500 to 42,000 nm (pyrgeometer)
  • Response time: <18 seconds
  • Typical sensitivity range: 5 to 20 µV W-1 m2
  • Output range: 0 to 15 mV (pyranometer), ±5 mV (pyrgeometer)
  • Expected accuracy for daily totals: <10%
  • Operating temperature: -40° to 80°C


Request information about this product

What would you like to know?
Prices/Costs   How to Buy   Any other questions/comments:
Your Name:

Your Email Address: Required

(Note. This is only be used for a reply)
Your Phone Number: Required
Your Location/City: Required
Your Country: Required

We will get back to you as soon as possible.