Campbell CNR4 User Manual Download Page 1

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CNR4

Net Radiometer

Issued: 29.7.13

Printed under licence by Campbell Scientific Ltd.

CSL 874

USER MANUAL

Summary of Contents for CNR4

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Page 3: ...e repair is under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order Quotations for repairs...

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Page 5: ...l cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European market in so...

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Page 7: ...ion with Pyranometer 9 5 2 Measuring Long wave Far Infrared Radiation with Pyrgeometer 9 5 3 Measuring CNR4 Temperature with Thermistor 10 5 4 Calculation of Albedo 12 5 5 Calculation of Net Short wav...

Page 8: ...lator unit top view 3 3 1 Attaching the mounting rod to the CNR4 body 7 3 2 Attaching the CNR4 onto the mounting rod 010759 using vertical pole or horizontal crossarm 8 6 1 The CNR4 sensor with SOLAR...

Page 9: ...ntial Measurement 16 6 2 Datalogger Connections for Single ended Measurement 16 A 1 Typical output signals of CNR4 under different meteorological conditions Explanation can be found in the text A 1 B...

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Page 11: ...ntegrated solar shield that reduces thermal effects on both the short wave and the long wave measurements The cables are made from Santoprene jacket which is intended for outdoor use and is resistant...

Page 12: ...ndix B for more information on the CNF4 The properties of the CNR4 are mainly determined by the properties of the individual probes Generally the accuracy of the CNR4 will be higher than that of compe...

Page 13: ...uminium body Shock vibration IEC 721 3 2 2m2 CE Complies with EC guideline 89 336 EEC 73 23 EEC Environmental protection IP 67 Requirements for data acquisition Radiation components 4 differential or...

Page 14: ...nse Non linearity 1 0 1000 W m 2 irradiance Non stability 1 Temperature dependence of sensitivity 4 10 to 40 C Tilt response 1 at any angle with 1000 W m2 Directional error 20 W m2 at angle up to 80 w...

Page 15: ...se time 18 seconds 95 response Non linearity 1 250 to 250 W m2 irradiance Temperature dependence of sensitivity 4 10 to 40 C Tilt error 1 deviation when tilted at any angle off horizontal Zero offset...

Page 16: ...uch that no shadow is cast on the net radiometer at any time during the day In the Northern Hemisphere this implies that the net radiometer should be mounted south of the mast It is suggested that the...

Page 17: ...e bubble level on the top of the CNR4 and tighten the four screws on top of the mounting bracket to properly secure the mounting rod so that it does not rotate Do not attempt to rotate the instrument...

Page 18: ...y This is specified as the so called tilt effect From the specifications one can see that the tilt effect this is a change in sensitivity remains within 1 See specifications in Section 2 for more deta...

Page 19: ...a positive signal The pyranometer mounting plate and ambient air should be at the same temperature as much as possible Conversion of the voltage to irradiance can be done according to equation 5 1 and...

Page 20: ...or resistance values as a function of temperature Relatively small errors occur when the CNR4 is not in thermal equilibrium This happens for example when the heater is on or when the sun is shining Wh...

Page 21: ...11 10 9 8 7 6 5 4 3 2 1 135200 127900 121100 114600 108600 102900 97490 92430 87660 83160 78910 74910 71130 67570 64200 61020 58010 55170 52480 49940 47540 45270 43110 41070 39140 37310 35570 33930 3...

Page 22: ...14 77 115 15 115 54 115 93 116 31 116 70 117 08 117 47 117 85 118 24 118 62 119 01 119 40 119 78 120 16 120 55 120 93 121 32 121 70 122 09 122 47 122 86 5 4 Calculation of Albedo The albedo is the rat...

Page 23: ...tain the sensor body temperature T cancel each other Therefore if one is only interested in the net long wave radiation instead of separate upper and lower components of the long wave radiation the CN...

Page 24: ...nt of the CNR4 The wiring diagrams for the thermistor in this manual is applicable only if the CNR4 and the cables were purchased from Campbell Scientific The CNR4 comes with two sets of cables labell...

Page 25: ...t to AG or to keep the signal in common mode range The Tables 6 1 and 6 2 show the wiring instructions for the differential measurement and single ended measurement connections to the datalogger respe...

Page 26: ...r Up Signal Red Single Ended Input Single Ended Input Pyranometer Up Reference Blue Pyranometer Down Signal White Single Ended Input Single Ended Input Pyranometer Down Reference Black Pyrgeometer Up...

Page 27: ...multiplier parameter inside the datalogger program To convert the units divide the sensor sensitivity value into 1000 For example if the sensitivity is 7 30 V W m2 the multiplier is 1000 7 3 136 99 W...

Page 28: ...ructions ANALOG CHANNELS 1H CNR4 Pyranometer Upper signal red 1L CNR4 Pyranometer Upper signal reference blue gnd jumper to 1L 2H CNR4 Pyranometer Lower signal white 2L CNR4 Pyranometer Lower signal r...

Page 29: ...diation 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 Un...

Page 30: ...able DataTable cnr4_ts True 1 DataInterval 0 1 Sec 10 CardOut 1 1 Sample 4 cnr4 1 IEEE4 Sample 1 cnr4_T_K IEEE4 EndTable BeginProg Load the multiplier values for the CNR4 cnr4_mult 1 pyranometer_up_mu...

Page 31: ...Datalogger panel temperature Average Short wave radiation pyranometer up Average Short wave radiation pyranometer down Average Long wave radiation pyrgeometer up Average Long wave radiation pyrgeomete...

Page 32: ...voltage excitation red CNR4 sensor Public logger_temp batt_volt Public cnr4 4 Alias cnr4 1 short_up Alias cnr4 2 short_dn Alias cnr4 3 long_up Alias cnr4 4 long_dn Public cnr4_T_C CNR4 thermistor temp...

Page 33: ...pyranometer_dn_sensitivity W m 2 mV Const pyrgeometer_up_mult 1000 pyrgeometer_up_sensitivity W m 2 mV Const pyrgeometer_dn_mult 1000 pyrgeometer_dn_sensitivity W m 2 mV DataTable cnr4_data True 1 Dat...

Page 34: ...to measure the four radiation outputs and one excitation channel and one single ended channel to measure the thermistor The program measures the sensors every 1 second performs the on line processing...

Page 35: ...he datalogger Search for the text string unique to find places to enter the sensitivity values Wiring Instructions ANALOG CHANNELS 1H CNR4 Pyranometer Upper signal red 1L CNR4 Pyranometer Upper signal...

Page 36: ...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 upp...

Page 37: ...or measurement BrHalf Vs_Vx 1 mv5000 21 Vx1 1 2500 True 0 250 1 0 0 Rs 1000 Vs_Vx 1 Vs_Vx cnr4_T_C 1 1 0295e 3 2 391e 4 LN Rs 1 568e 7 LN Rs 3 273 15 Convert CNR4 temperature to Kelvin cnr4_T_K cnr4_T...

Page 38: ...esting set a voltmeter to its most sensitive range setting Darken the sensor The signal should read zero Bear in mind that the response takes about one minute Small deviations from zero are possible t...

Page 39: ...a multimeter measure the resistance between the two opposite wires of the Pt 100 gray yellow gray brown green yellow green brown and compare the measured value with the resistance values listed in Ta...

Page 40: ...before the base plate is put back to keep the compartment sealed The CNR4 comes with two spare drying cartridges Additional drying cartridges CNR4 Replacement Drying Cartridge can be purchased from Ca...

Page 41: ...e water vapour in the air which is a major contributor to the far infrared radiation Table A 1 Typical output signals of CNR4 under different meteorological conditions Explanation can be found in the...

Page 42: ...90 80 70 60 50 40 30 20 10 0 10 20 30 0 00 00 1 00 00 2 00 00 3 00 00 4 00 00 5 00 00 6 00 00 7 00 00 8 00 00 9 00 00 10 00 00 11 00 00 12 00 00 13 00 00 14 00 00 15 00 00 16 00 00 17 00 00 18 00 00...

Page 43: ...the Pt 100 reading may rise due to solar heating up to 10 degrees above ambient temperature During the night the sensor temperature may be lower than the ambient temperature due to far infrared radiat...

Page 44: ...CNR4 Net Radiometer A 4 4 1 8 10 67 5 CG3 upper E ature Sky temper B 1 4 1 8 10 67 5 CG3 lower E e Temperatur Ground B 2...

Page 45: ...d the water deposition on the pyrgeometer sensor window and on the pyranometer domes The water deposition on the pyrgeometer window will ultimately obstruct the far infrared radiation completely causi...

Page 46: ...n the dew point of the air falls to within 1 C of the sensor body temperature Do not use the SW12 channel of a CR1000 or CR3000 to simultaneously power the heater and ventilator Simultaneously powerin...

Page 47: ...unto the bottom of the CNR4 sensor using the three pan head screws and washers as shown in Figure B 2 Make sure that the pyranometer and the pyrgeometer windows are not scratched during the installati...

Page 48: ...s shown in Figure B 3 and place the white solar shield over it Use the four flat head screws provided to complete the solar shield installation to the CNF4 as shown in Figure B 4 and B 5 Figure B 3 Ma...

Page 49: ...number and the sensitivity values for the four sensors Affix the extra label that came with the sensor to the bottom side of the CNF4 s anodized aluminium base so that the label is in a visible locati...

Page 50: ...Ground Blue G G Heater Power Green SW12V SW12V 2 Heater Ground Yellow G G Shield Clear Jumper to with user supplied wire Pull back wires for Pt 100 grey brown green and yellow which are not in use and...

Page 51: ...turned on off by setting flag 1 and flag 2 high and low respectively User must enter the sensitivity values for all four probes in the program and save compile prior to downloading it to the datalogg...

Page 52: ...4_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 Cert...

Page 53: ...eometer_up_mult cnr4_mult 4 pyrgeometer_dn_mult Scan 1 Sec 3 0 P anelTemp logger_temp 250 B attery batt_volt CNR4 radiation measurements CNR4 thermistor measurement BrHalf Vs_Vx 1 mv5000 16 Vx1 1 2500...

Page 54: ...er each foot of cable If the correct resistance value is measured but the ventilator still mal functions it is possible that the ventilator is stalled by an object blocking the fan Remove the black co...

Page 55: ...hermistor temperature degrees C Average CNR4 thermistor temperature Kelvin Average Corrected long wave radiation pyrgeometer up Average Corrected long wave radiation pyrgeometer down Average Short wav...

Page 56: ...d jumper to 1L 2H CNR4 Pyranometer Lower signal white 2L CNR4 Pyranometer Lower signal reference thin black gnd jumper to 2L 3H CNR4 Pyrgeometer Upper signal grey 3L CNR4 Pyrgeometer Upper signal refe...

Page 57: ...them below Const pyranometer_up_sensitivity 15 35 unique sensitivity for upper pyranometer microV W m 2 Const pyranometer_dn_sensitivity 15 41 unique sensitivity for lower pyranometer microV W m 2 Co...

Page 58: ...ture measurement Resistance cnr4_prt_R 1 mV200 8 Ix1 1 1500 True True 0 _60Hz 1 0 Rs_R0 cnr4_prt_R 100 PRT cnr4_T_C 1 Rs_R0 1 0 Convert CNR4 temperature to Kelvin cnr4_T_K cnr4_T_C 273 15 Correct the...

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