Related Manuals for Campbell CNR2
Summary of Contents for Campbell 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 ,...
- Page 2 If the form is not received within three days of product receipt or is incomplete, the product will be returned to the customer at the customer’s expense. Campbell Scientific reserves the right to refuse service on products that were exposed to contaminants that may cause health or safety...
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Page 3: Table Of Contents
Figures 2-1. The Dimensions of the CNR2 ..............2 3-1. Mounting According to Hemisphere ............3 3-2. The CNR2 mounted to a pole (top) and crossarm (bottom) via the 26120 Mounting Bracket Kit............4 5-1. Pin Layout on Campbell Scientific Black Cable ........6... - Page 4 CNR2 Table of Contents 8-1. Dirt, Rain, or Snow on CNR2 Sensor will Reduce the Readings ..12 8-2. CNR2 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.
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Page 5: General Description
Net long- wave radiation is a final result of measurements from those two detectors. Additional information on the CNR2 sensor can be found in the Kipp & Zonen CNR2 Manual. The primary intent of this manual is to provide information on interfacing the CNR2 to Campbell Scientific dataloggers. -
Page 6: Pyranometer Specifications
Install the CNR2 such that no shadow is cast on the net radiometer at any time during the day. In the Northern Hemisphere, mount the CNR2 south of the mast. -
Page 7: The 26120 Mounting Bracket Kit
CNR2 Net Radiometer FIGURE 3-1. Mounting According to Hemisphere Mount the CNR2 at a height of at least 1.5 meters above the surface to avoid the shading effects of the instruments on the soil and to promote spatial averaging of the measurement. If the instrument is H meters above the surface, 99% of the input of the lower sensors comes from a circular area with a radius of 10 H. -
Page 8: The Cnr2 Mounted To A Pole (Top) And Crossarm (Bottom) Via
For installation in buildings or in solar energy applications, 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. -
Page 9: Using The Cnr2 In The Two Separate Components Mode (2Scm)
CNR2 Net Radiometer 4. Using the CNR2 in the Two Separate Components Mode (2SCM) The two pyranometers will measure the short-wave radiation (incoming from the sky and reflected from the soil surface); the two pyrgeometers will measure the long-wave radiation (incoming from the sky and reflected from the soil surface). -
Page 10: Calculation Of The Net Solar Radiation
NETSW NETLW 5. Wiring The two radiation outputs from CNR2 Net Radiometer can be measured using differential or 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. -
Page 11: Datalogger Programming
Clear 6. Datalogger Programming The CNR2 outputs two voltages that typically range from 0 to 15 mV for the pyranometers, and ±5 mV for the pyrgeometers. Use a differential voltage measurement because it has better noise rejection than a single-ended measurement. -
Page 12: Calibration Factor
6.1 Calibration Factor Each CNR2 is shipped with a ‘Certificate of Calibration’ by the manufacturer that shows the sensor serial number and ‘sensitivity’, or calibration factor. The serial number and sensitivity are also shown on a label attached to the sensor. -
Page 13: Example Program For Cr10X Datalogger
'Call Data Tables and Store Data 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) ;... - Page 14 CNR2 Net Radiometer ; Measure Net Longwave Radiation 2: Volt (Diff) (P2) 1: 1 Reps 2: 22 7.5 mV 60 Hz Rejection Range 3: 2 DIFF Channel 4: 2 Loc [ Net_LW ] 5: 86.21 Multiplier 6: 0.0 Offset ;Measure Net Radiation...
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Page 15: Calibration
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... -
Page 16: Maintenance
CNR2 Net Radiometer 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... -
Page 17: Typical Values
FIGURE 8-2. CNR2 Net Radiometer Bubble-Level Replace drying cartridge 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/m²... - Page 18 CNR2 Net Radiometer...
- Page 20 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za • cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)