CNR1

Net Radiometer

Frequently Asked Questions: CNR1


  1. How often do you recommend recalibration of the CNR1?

    Recommended recalibration for CNR1 is every 2 years, as stated in chapter 7, page 22 of the CNR1 manual.

  2. I was wondering how high above the ground to place the net radiometer. The booklet says to place it 1.5 m above grass, but this tower will be in the middle of corn field. Do you have any suggestions? Are there any other considerations that need to be taken into account when mounting the device?

    The rule of thumb is to go at least 1.5 m above the tallest plant (tree) in an ecosystem.

  3. Will this radiometer read out the values of incoming and reflected components separately or does it just give the net value?

    CNR1 is a four-output net radiometer. It will give values for incoming short-wave, incoming long-wave, outgoing short-wave and outgoing long-wave radiation. It will also calculate the net radiation and albedo.

  4. We are trying to set up a Bowen Ratio system for a hydrological research project. We did purchase radiometers from you and we are wondering how to connect your radiometer (CNR1) to the Bowen Ratio system.

    If you are running your BR (Bowen Ratio) system on 21X or CR23X dataloggers you will not be able to run a CNR1 net radiometer, since those dataloggers do not have enough input channels. Because of that it is recommended to run a CNR1 out of a separate datalogger.



  5. I am looking for a net radiation and a solar radiation sensor for Idaho to be deployed during the summer and winter. Would the CNR1 be a good choice? I don't know if I will have enough power to use the heater consistently.

    Yes, the CNR1 is a good choice, even though an expensive choice. You will get the same results by using any of our pyranometers and NR-Lite net-radiation sensor. A heater on a CNR1 is not needed. If you expect to be using it in nonwinter months there is absolutely no need for a heater.





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