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CNR4 Net RadiometerRevision: 11/10Copyright © 2000-2010Campbell Scientific, Inc.

CNR4 Net Radiometer 2.2 Pyranometer Specifications * indicates ISO specifications. Spectral range: 305 to 2800 nm (50% points) Sensitivity: 10 to 20

CNR4 Net Radiometer 2.3 Pyrgeometer Specifications Spectral range: 4.5 μm to 42 μm (50% points) Sensitivity: 5 to 15 μV/W/m2 Impedance: 20 Ω to 200

CNR4 Net Radiometer 2.4.1 CNF4 Specifications Heater Power consumption: 10 W @ 12 Vdc (15 Ω) Ventilator Power consumption: Supply voltage: 5 W @ 12

CNR4 Net Radiometer Do not attempt to rotate the instrument using the sensor heads, or you may damage the sensors; use the mounting rod only. NOTE 4.

CNR4 Net Radiometer FIGURE 3-2. Attaching the CNR4 onto the mounting rod (CSI p/n 26120) using vertical pole or horizontal crossarm. For installat

CNR4 Net Radiometer 5. Using the CNR4 in the Four Separate Components Mode In the four separate components mode configuration (measuring two short-wa

CNR4 Net Radiometer colder. This means that for estimating the far infrared radiation that is generated by the object that is faced by the pyrgeomete

CNR4 Net Radiometer The thermistor measurement can be done by the datalogger, using the half bridge measurement method which requires one voltage exci

CNR4 Net Radiometer TABLE 5-2. Resistance values versus CNR4's Pt-100 temperature in °C. Temperature [°C] Resistance[Ω] Temperature[°C] Resista

CNR4 Net Radiometer In the equation above, E is calculated according to the Equation 5-1. Albedo will always be smaller than 1. Checking this can be

Warranty and Assistance The CNR4 NET RADIOMETER is warranted by Campbell Scientific, Inc. to be free from defects in materials and workmanship under n

CNR4 Net Radiometer 5.7 Calculation of Net (Total) Radiation In the four separate components mode, net radiation, Rn, can be calculated using the ind

CNR4 Net Radiometer FIGURE 6-2. The marks on the end of the CNR4: S for SOLAR cable, and T for TEMP cable. The measurement details for Pt-100 sensor

CNR4 Net Radiometer FIGURE 6-4. Labels on the pigtail end of the TEMP cable. TABLE 6-1. Datalogger Connections for Differential Measurement Functio

CNR4 Net Radiometer 7. Datalogger Programming The CNR4 outputs four voltages that typically range from 0 to 15 mV for the pyranometers, and ± 5 mV fo

CNR4 Net Radiometer Average Corrected long-wave radiation (pyrgeometer up) Average Corrected long-wave radiation (pyrgeometer down) Average Shor

CNR4 Net Radiometer Public cnr4_T_C 'CNR4 thermistor temperature in Celcius Public cnr4_T_K 'CNR4 thermistor temp

CNR4 Net Radiometer Average (1,Rl_net,IEEE4,False) Average (1,albedo,IEEE4,False) Average (1,Rn,IEEE4,False) EndTable DataTable (cnr4_ts,True,-1)

CNR4 Net Radiometer 7.2.2 Example 2, CR3000 Program Using Differential Measurements The Program Example 2 requires four differential channels to meas

CNR4 Net Radiometer '8H '8L CNR4 thermistor signal (white) 'gnd CNR4 thermistor signal reference (black) '

CNR4 Net Radiometer 'CNR4 multipliers Public cnr4_mult(4) Const pyranometer_up_mult = 1000/pyranometer_up_sensitivity '(W/m^2/mV) Const pyr

CNR4 Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for

CNR4 Net Radiometer 'Compute short-wave net radiation Rs_net = short_up - short_dn 'Compute long-wave net radiati

CNR4 Net Radiometer 'CR5000 Series Datalogger ' 'CNR4 program 'This program measures CNR4 four-component net radiometer 'This

CNR4 Net Radiometer Public Rl_net 'long-wave net radiation Public albedo 'Albedo Public Rn 'total net radiation Units

CNR4 Net Radiometer DataTable (cnr4_ts,True,-1) DataInterval (0,1,Sec,10) CardOut (1,-1) Sample (4,cnr4(1),IEEE4) Sample (1,cnr4_T_K,IEEE4) End

CNR4 Net Radiometer 8. Troubleshooting If there is no indication as to what may be the problem, start performing the following "upside-down test

CNR4 Net Radiometer 8.2 Testing the Pyrgeometer It is assumed that the zero offset is no more than a few watts per square meter (see second test in s

CNR4 Net Radiometer 9.2 Recalibration For quality assurance of the measured data, the manufacturer recommends the CNR4 be recalibrated on a regular s

CNR4 Net Radiometer 9.4 Replacement Parts The following is the list of replacement parts for the CNR4 and CNF4 (heater/ventilator) available from Cam

CNR4 Net Radiometer 32

Appendix A. CNR4 Performance and Measurements under Different Conditions Below, Table A-1 shows what one might typically expect to measure under diff

CNR4 Table of Contents 9. Maintenance and Recalibration ...29 9.1 Cleaning Windows and Domes...

Appendix A. CNR4 Performance and Measurements under Different Conditions FIGURE A-1. Different measurement conditions and signals. Upperpyrgeomete

Appendix A. CNR4 Performance and Measurements under Different Conditions upwellingsignal(downwardfacing)pyrgeometer‐30‐20‐1001020300:00:001:00:00

Appendix A. CNR4 Performance and Measurements under Different Conditions 4/181067.5⎥⎦⎤⎢⎣⎡⋅=−CG3upper EatureSky temper (B-1) 4/181067.5⎥⎦⎤⎢⎣⎡⋅=−CG3

Appendix B. CNF4 Heater/Ventilator Whenever the heater is used, the heating may cause errors in the measurement of the sensor temperature. Under most

Appendix B. CNF4 Heater/Ventilator 10 Watt power available? Not available DO NOT HEAT Available Consider options below Clock and relay available? N

Appendix B. CNF4 Heater/Ventilator B.2 Attaching the Optional CNF4 Heater/Ventilator Unit to CNR4 1. The CNF4 heater/ventilator unit comes with the

Appendix B. CNF4 Heater/Ventilator 2. Attach the heater/ventilator unit unto the bottom of the CNR4 sensor, using the three pan-head screws and wash

Appendix B. CNF4 Heater/Ventilator 3. Make sure the cables are cleared from the edges of the CNF4, as shown in Figure B-3, and place the white solar

Appendix B. CNF4 Heater/Ventilator FIGURE B-5. Attaching the solar shield to CNF4 using four flat-head screws. 4. Once the CNF4 heater/ventilator

Appendix B. CNF4 Heater/Ventilator B.3 Wiring The following table shows the recommended datalogger wiring for using the CNR4 sensor with the CNF4 he

CNR4 Table of Contents Tables 5-1. Resistance values versus CNR4's thermistor temperature in °C ...11 5-2. Resistance values versus CNR

Appendix B. CNF4 Heater/Ventilator B.4 Example B, CR3000 Datalogger Program with Heater/Ventilator Control The Program Example B measures the four r

Appendix B. CNF4 Heater/Ventilator ' ' '8H '8L CNR4 thermistor signal (white) 'gnd CNR4 thermistor signal refe

Appendix B. CNF4 Heater/Ventilator Dim Rs, Vs_Vx 'CNR4 sensitivities: refer to the Certificate of Calibration from Kipp & Zonen for sensiti

Appendix B. CNF4 Heater/Ventilator 'CNR4 thermistor measurement BrHalf (Vs_Vx,1,mv5000,16,Vx1,1,2500,True ,0,250,1.0,0) Rs =

Appendix B. CNF4 Heater/Ventilator B-12 pulling it straight out. Inspect the fan inside for any object that might impede the fan’s rotation. Upon c

Appendix C. CR3000 Program for Measuring Pt-100 Temperature Sensor The program example C measures the Pt-100 sensor for the body temperature of the C

Appendix C. CR3000 Program for Measuring Pt-100 Temperature Sensor 'CR3000 Series Datalogger ' 'CNR4 program 'This program measur

Appendix C. CR3000 Program for Measuring Pt-100 Temperature Sensor Public cnr4_T_C 'CNR4 thermistor temperature in Celcius Public cnr4_T_K &

Appendix C. CR3000 Program for Measuring Pt-100 Temperature Sensor C-4 Average (1,albedo,IEEE4,False) Average (1,Rn,IEEE4,False) EndTable DataTabl

CNR4 Table of Contents iv

Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbel

CNR4 Net Radiometer 1. General Description The CNR4 is a four component net radiometer that measures the energy balance between incoming and outgoing

CNR4 Net Radiometer 2. Sensor Specifications The CNR4 consists of two pyranometers, for measuring short-wave radiation, and of two pyrgeometers for m

CNR4 Net Radiometer 2.1 CNR4 Specifications Sensor sensitivities: Four probes have unique sensitivity values. Please refer to the calibration sheets