Campbell CNR2 User Manual Download

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CNR2 Net Radiometer

Revision: 5/10

C o p y r i g h t © 2 0 0 0 - 2 0 1 0

C a m p b e l l S c i e n t i f i c , I n c .

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Summary of Contents for CNR2

Page 1: ...CNR2 Net Radiometer Revision 5 10 C o p y r i g h t 2 0 0 0 2 0 1 0 C a m p b e l l S c i e n t i f i c I n c ...

Page 2: ...customers residing in countries served by Campbell Scientific Inc directly Affiliate companies handle repairs for customers within their territories Please visit www campbellsci com to determine which Campbell Scientific company serves your country To obtain a Returned Materials Authorization RMA contact CAMPBELL SCIENTIFIC INC phone 435 753 2342 After an applications engineer determines the natur...

Page 3: ...the Pyranometers 5 4 2 Measuring Far Infrared Radiation with the Pyrgeometers 5 4 3 Calculation of the Net Solar Radiation 6 5 Wiring 6 6 Datalogger Programming 7 6 1 Calibration Factor 8 6 2 Example Programs 8 6 2 1 Example Program for CR1000 Datalogger 8 6 2 2 Example Program for CR10X Datalogger 9 7 Calibration 11 8 Maintenance 12 9 Typical Values 13 Figures 2 1 The Dimensions of the CNR2 2 3 1...

Page 4: ... Net Radiometer Bubble Level 13 8 3 Replacing Drying Cartridge 13 Tables 5 1 CRBasic Datalogger Connections for Differential Measurement 6 5 2 Edlog Datalogger Connections for Differential Measurement 7 5 3 Campbell Scientific Cable vs Kipp Zonen Cable 7 9 1 Typical Values from CNR2 Net Radiometer 13 ...

Page 5: ... wave radiation and long wave radiation are measured separately Short wave radiation is measured by two pyranometers one for measuring incoming short wave radiation from the sky and the other which faces downward for measuring the reflected short wave radiation The final result from these two pyranometers is net short wave radiation Long waveradiation is measured by two pyrgeometers one for measur...

Page 6: ...Spectral range 4 5 to 42 µm Field of view of upper detector 150 Field of view of lower detector 150 Non linearity 250 to 250 W m 2 net irradiance 1 3 Installation For measurement of the net radiation it is important that the instrument is located in a place that is representative of the entire study region Install the CNR2 such that no shadow is cast on the net radiometer at any time during the da...

Page 7: ...0 This mounting rod will need to be purchased if the CNR2 was shipped prior to February 2010 NOTE Mount the sensor as follows 1 Screw the 26127 mounting rod into the base of the CNR2 2 Attach the 26120 mounting bracket to the pole or crossarm using the kit s U bolts see Figure 3 2 3 Insert the 26127 mounting rod into the mounting block of the 26120 mounting bracket kit Make sure the sensor points ...

Page 8: ...pplications users will often have to mount the CNR2 parallel to the surface that is being studied This may be in a tilted or a vertical position The sensitivity of the radiometers will be affected but only in a minor way This is specified as the so called tilt effect From the specifications notice that the tilt effect this is change in sensitivity remains within 1 4 ...

Page 9: ...ar radiation is made by the sensor the reflected radiation is subtracted from the global radiation To find the net short wave radiation divide the measured short wave output from the sensor by its sensitivity SW SW NETSW S U E 4 1 Where ENETSW is the net short wave radiation in W m 2 USW is output voltage in µV SSW is sensitivity in 2 m W V μ 4 2 Measuring Far Infrared Radiation with the Pyrgeomet...

Page 10: ... single ended inputs on the datalogger A differential voltage measurement VoltSE instruction in CRBasic or Instruction 2 in Edlog is recommended because it has better noise rejection than a single ended measurement FIGURE 5 1 Pin Layout on Campbell Scientific Black Cable TABLE 5 1 CRBasic Datalogger Connections for Differential Measurement Heat Shrink Label Color Pin Number CR800 CR850 CR1000 CR30...

Page 11: ...meter was purchased from Kipp and Zonen the color of the connection cable is yellow and have the pin out shown in Figure 5 2 FIGURE 5 2 Pin Layout on Kipp Zonen Original Cable TABLE 5 3 Campbell Scientific Cable vs Kipp Zonen Cable Campbell Scientific Cable Kipp Zonen Cable White Red Blue Blue Brown Green Black Yellow Clear Clear 6 Datalogger Programming The CNR2 outputs two voltages that typicall...

Page 12: ...e radiation the multipliers are Short Wave 1000 22 0 μV W m 2 45 46 W m 2 mV Long Wave 1000 11 6 μV W m 2 86 21 W m 2 mV 6 2 Example Programs 6 2 1 Example Program for CR1000 Datalogger CNR2 Net Radiometer program for CR1000 datalogger Wiring 1H Short wave signal white 1L Short wave signal reference blue 2H Long wave signal brown 2L Long wave signal reference black gnd Shield clear Declare Constan...

Page 13: ...ta CallTable Table1 NextScan EndProg 6 2 2 Example Program for CR10X Datalogger CNR2 Net Radiometer program for CR10X datalogger Wiring 1H Shortwave signal white 1L Shortwave signal reference blue 2H Longwave signal brown 2L Longwave signalreference black gnd Shiled clear Wiring 1H Shortwave signal white 1L Shortwave signal reference blue gnd 2H Longwave signal brown 2L Longwave signal reference b...

Page 14: ... Seconds into a 2 60 Interval same units as above 3 10 Set Output Flag High Flag 0 5 Set Active Storage Area P80 2826 1 1 Final Storage Area 1 2 102 Array ID 6 Real Time P77 11314 1 1220 Year Day Hour Minute midnight 2400 7 Minimum P74 13722 1 1 Reps 2 10 Value with Hr Min 3 1 Loc Net_SW 8 Maximum P73 10217 1 1 Reps 2 10 Value with Hr Min 3 1 Loc Net_SW 9 Average P71 10475 1 1 Reps 2 1 Loc Net_SW ...

Page 15: ... Serial Out P96 1 71 Storage Module Table 3 Subroutines End Program 7 Calibration Recalibrate the CNR2 every two years or as an alternative by running a higher standard next to it Compare the pyranometers over a two day period when the days are clear Compare the pyrgeometers during the night Deviations of more than 6 can be used to correct the calibration factors 11 ...

Page 16: ...adiometer 8 Maintenance Clean domes and windows with distilled water or alcohol Readings are reduced if domes and or windows are not clean FIGURE 8 1 Dirt Rain or Snow on CNR2 Sensors will Reduce the Readings 12 ...

Page 17: ...dge every 6 months FIGURE 8 3 Replacing Drying Cartridge first replacement cartridge comes with the CNR2 9 Typical Values TABLE 9 1 Typical Values from CNR2 Net Radiometer Wavelength Fully Clouded Sunny Partly Clouded Clear and Sunny Net short wave 0 to 120 W m 50 to 500 W m 200 to 1000 W m Net long wave 25 to 25 W m 50 to 50 W m 50 to 200 W m 13 ...

Page 18: ...CNR2 Net Radiometer 14 ...

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Page 20: ...rp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci co uk sales campbe...

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