Specifications
Table Of Contents
- Revision and Copyright Information
- Warranty and Assistance
- Table of Contents
- CNR4 Net Radiometer
- 1. General Description
- 2. Sensor Specifications
- 3. Installation
- 4. Using the Optional CNF4 Heater/Ventilator Unit
- 5. Using the CNR4 in the Four Separate Components Mode
- 5.1 Measuring Short-wave Solar Radiation with Pyranometer
- 5.2 Measuring Long-wave Far Infrared Radiation with Pyrgeometer
- 5.3 Measuring CNR4 Temperature with Thermistor
- 5.4 Calculation of Albedo
- 5.5 Calculation of Net Short-wave Radiation
- 5.6 Calculation of Net Long-wave Radiation
- 5.7 Calculation of Net (Total) Radiation
- 6. Wiring
- 7. Datalogger Programming
- 8. Troubleshooting
- 9. Maintenance and Recalibration
- Appendix A. CNR4 Performance and Measurements under Different Conditions
- Appendix B. CNF4 Heater/Ventilator
- Appendix C. CR3000 Program for Measuring Pt-100 Temperature Sensor
- Campbell Scientific Contact Information

CNR4 Net Radiometer
Public Rl_net 'long-wave net radiation
Public albedo 'Albedo
Public Rn 'total net radiation
Units logger_temp = degC
Units batt_volt = volts
Units short_up = W/m^2
Units short_dn = W/m^2
Units long_up = W/m^2
Units long_dn = W/m^2
Units cnr4_T_C = deg_C
Units cnr4_T_K = K
Units long_up_corr = W/m^2
Units long_dn_corr = W/m^2
Units Rs_net = W/m^2
Units Rl_net = W/m^2
Units albedo = W/m^2
Units Rn = W/m^2
Dim Rs, Vs_Vx
'CNR4 sensitivities: refer to the Certificate of Calibration from Kipp & Zonen for sensitivity values
'for each probes, and enter them below.
Const pyra_up_sensitiv = 15.35 'unique sensitivity for upper pyranometer (microV/W/m^2)
Const pyra_dn_sensitiv = 15.41 'unique sensitivity for lower pyranometer (microV/W/m^2)
Const pyrg_up_sensitiv = 8.50 'unique sensitivity for upper pyrgeometer (microV/W/m^2)
Const pyrg_dn_sensitiv = 7.09 'unique sensitivity for lower pyrgeometer (microV/W/m^2)
'CNR4 multipliers
Public cnr4_mult(4)
Const pyra_up_mult = 1000/pyra_up_sensitiv '(W/m^2/mV)
Const pyra_dn_mult = 1000/pyra_dn_sensitiv '(W/m^2/mV)
Const pyrg_up_mult = 1000/pyrg_up_sensitiv '(W/m^2/mV)
Const pyrg_dn_mult = 1000/pyrg_dn_sensitiv '(W/m^2/mV)
DataTable (cnr4_dat,True,-1)
DataInterval (0,60,Min,10)
CardOut (1,-1)
Minimum (1,batt_volt,FP2,0,False)
Sample (1,logger_temp,FP2)
Average (4,cnr4(1),IEEE4,False)
Average (1,cnr4_T_C,IEEE4,False)
Average (1,cnr4_T_K,IEEE4,False)
Average (1,long_up_corr,IEEE4,False)
Average (1,long_dn_corr,IEEE4,False)
Average (1,Rs_net,IEEE4,False)
Average (1,Rl_net,IEEE4,False)
Average (1,albedo,IEEE4,False)
Average (1,Rn,IEEE4,False)
EndTable
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