Campbell CNR4 Instruction Manual Download Page 44

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Appendix B. Example Programs

B-6

Average

(1,cnr4_T_K,IEEE4,False)

Average

(1,LWTopC,IEEE4,False)

Average

(1,LWBottomC,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

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_mult
            cnr4_mult(2) = pyranometer_dn_mult
            cnr4_mult(3) = pyrgeometer_up_mult
            cnr4_mult(4) = pyrgeometer_dn_mult

Scan

(1,Sec,3,0)

PanelTemp

(logger_temp,250)

Battery

(batt_volt)

'CNR4 radiation measurements

VoltDiff

(cnr4(),4,mV20C,1,True ,0,_60Hz,cnr4_mult(),0)

'CNR4 thermistor measurement

BrHalf

(Vs_Vx,1,mv5000,16,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 = c273.15

'Correct the long-wave radiation values from pyrgeometers

LWTopC = LWTop+5.67e-8*cnr4_T_K^4
LWBottomC = L5.67e-8*cnr4_T_K^4

'Compute short-wave net radiation

Rs_net = SWTop - SWBottom

'Compute long-wave net radiation

Rl_net = LWTopC - LWBottomC

'Compute albedo

albedo = SWBottom/SWTop

'Compute net radiation

Rn = Rl_net

CallTable

cnr4_data

CallTable

cnr4_ts

NextScan

EndProg

Summary of Contents for CNR4

Page 1: ...INSTRUCTION MANUAL CNR4 Net Radiometer Revision 2 17 C o p y r i g h t 2 0 0 0 2 0 1 7 C a m p b e l l S c i e n t i f i c I n c ...

Page 2: ......

Page 3: ...ducts to CSI CSI will return such Products by surface carrier prepaid within the continental United States of America To all other locations CSI will return such Products best way CIP port of entry per Incoterms 2010 This warranty shall not apply to any Products which have been subjected to modification misuse neglect improper service accidents of nature or shipping damage This warranty is in lieu...

Page 4: ... address is CAMPBELL SCIENTIFIC INC RMA _____ 815 West 1800 North Logan Utah 84321 1784 For all returns the customer must fill out a Statement of Product Cleanliness and Decontamination form and comply with the requirements specified in it The form is available from our website at www campbellsci com repair A completed form must be either emailed to repair campbellsci com or faxed to 435 227 9106 ...

Page 5: ...e beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers Use only manufacturer recommended parts materials and tools Utility and Electrical You can be kil...

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Page 7: ...0 7 2 Mounting 10 7 3 Wiring 13 7 4 Datalogger Programming 16 7 4 1 Sensor Sensitivity 17 8 Operation 17 8 1 Measuring Short wave Solar Radiation with Pyranometer 17 8 2 Measuring Long wave Far Infrared Radiation with Pyrgeometer 18 8 3 Measuring CNR4 Temperature with Thermistor 18 8 4 Calculation of Albedo 20 8 5 Calculation of Net Short wave Radiation 21 8 6 Calculation of Net Long wave Radiatio...

Page 8: ...igures 6 1 The CNR4 net radiometer with cables and mounting rod top view 7 6 2 The CNR4 net radiometer with CNF 4 heater ventilator unit top view 7 7 1 Attaching the mounting rod to the CNR4 body 11 7 2 Attaching the CNR4 onto the mounting rod pn 26120 using vertical pole or horizontal crossarm 12 7 3 The CNR4 sensor with SOLAR and TEMP cables 13 7 4 The marks on the end of the CNR4 S for SOLAR ca...

Page 9: ...nnections for Differential Measurement with Pt 100 B 10 C 1 Typical output signals of CNR4 under different meteorological conditions Explanation can be found in the text C 1 D 1 Datalogger Connections for Differential Measurement with Heater Ventilator Control D 7 CRBasic Examples B 1 CR1000 Program Using Differential Measurements B 1 B 2 CR3000 Program Using Differential Measurements B 4 B 3 CR50...

Page 10: ...Table of Contents iv ...

Page 11: ...f damage to the cable is suspected contact Campbell Scientific Do not attempt to rotate the instrument using the sensor heads or you may damage the sensors use the mounting rod only 3 Initial Inspection Upon receipt of the CNR4 inspect the packaging and contents for damage File damage claims with the shipping company The model number and cable length are printed on a label at the connection end of...

Page 12: ...is an easy way to program your datalogger to measure the pyranometer and assign datalogger wiring terminals Short Cut is available as a download on www campbellsci com and the ResourceDVD It is included in installations of LoggerNet PC200W PC400 or RTDAQ Use the following procedure to get started 1 Open Short Cut Click New Program NOTE ...

Page 13: ...an Interval default of 5 seconds is OK for most applications Click Next 3 Under the Available Sensors and Devices list select Sensors Meteorological Solar Radiation folder Select CNR4 Net Radiation Click to move the selection to the Selected device window ...

Page 14: ...lues are unique to each sensor The public variables defaults can typically be used After entering the information click on OK and then select Next 5 After selecting the sensitivity values click Wiring Diagram to see how the sensor is to be wired to the datalogger The wiring diagram can be printed now or after more sensors are added ...

Page 15: ...information to correct the infrared readings for the temperature of the instrument housing Care has been taken to place the long wave sensors close to each other and close to the temperature sensors This ensures that the temperatures of the measurement surfaces are the same and accurately known improving the quality of the long wave measurements A completion resistor is added in the pig tail end o...

Page 16: ...effects on the sensors Compatible with Campbell Scientific CRBasic dataloggers CR6 series CR1000 CR3000 and CR5000 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 competitive net radiometers because the solar radiation measurement performed by the pyranometer is accurate and offers a traceabl...

Page 17: ...temperature 40 to 80 C 40 to 176 F Operating humidity 0 to 100 RH Bubble level sensitivity 0 5 Sensor type Thermopile Receiver paint Carbon Black Desiccant Silica gel replaceable Housing material Anodized aluminum 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 differenti...

Page 18: ...W m2 Directional error1 20 W m2 at angle up to 80 with 1000 W m2 Zero offset due to 0 to 200 W m2 IR net irradiance1 15 W m2 Zero offset due to temperature change1 3 W m2 5 K hr temperature change 1 W m2 with CNF4 installed Operating temperature 40 to 80 C Field of view Upper detector Lower detector 180 150 due to lower solar shield to prevent illumination at low zenith angles Maximum solar irradi...

Page 19: ...ature change Field of view Upper Lower 180 degrees 150 degrees Net irradiance 250 to 250 W m2 Non stability 1 sensitivity change per year Window heating offset 6 W m2 1000 W m2 solar irradiance Uncertainty in daily total 10 95 confidence level indoor calibration Typical signal output for atmospheric application 5 mV Temperature sensors Thermistor 10k Ω Pt 100 DIN class A Instrument calibration Ind...

Page 20: ...ngs or the mast or structure on which it is mounted 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 10h Shadows or surface disturbances with a radius 0 1h will affect the measurement by less than 1 2 To avoid shading or reflection effects and to promote spatial averaging the CNR4 should be mounted at least 1 5 m above...

Page 21: ...ch the 26120 mounting bracket to the vertical mounting pipe or CM200 series crossarm using the provided U bolt see FIGURE 7 2 If mounted to a vertical pipe ensure that the pipe does not cast a reflection on the sensor This includes both the incoming and outgoing sections of the sensor ...

Page 22: ...s support arm into the mounting block of the mounting bracket kit Make sure the sensor points in the direction of the arrows that appear after the word SENSOR on top of the bracket see FIGURE 7 2 If the CNR4 is being used at a location where snow and ice accumulate or high winds are expected then the mounting rod should not be fully extended NOTE ...

Page 23: ...has two outputs for short wave radiation two outputs for long wave radiation thermistor output and Pt 100 temperature sensor output In addition if a user chooses to attach the optional CNF4 heater ventilator unit it will have power wires for heater and ventilator All wiring diagrams shown in this manual and the sample programs will use the thermistor for the temperature measurement of the CNR4 The...

Page 24: ...ended inputs on the datalogger A differential voltage measurement is recommended because it has better noise rejection than a single ended measurement When differential inputs are used jumper the low side of the input to AG or to keep the signal in common mode range TABLE 7 1 shows the datalogger connections for the SOLAR cable and TABLE 7 2 shows the datalogger connections for the TEMP cable The ...

Page 25: ...ured for differential input1 2 DIFF L differential low analog voltage input 2 AG or analog ground Brown Pyrgeometer Bottom Signal U configured for differential input1 DIFF H differential high analog voltage input U configured for single ended analog input1 SE single ended analog voltage input Green Pyrgeometer Bottom Reference U configured for differential input1 2 DIFF L differential low analog v...

Page 26: ...t Short Cut code into CRBasic Editor to create or add to a customized program follow the procedure in Appendix A Importing Short Cut Code Into CRBasic Editor p A 1 Programming basics for CRBasic dataloggers are provided below Complete program examples for select dataloggers can be found in Appendix B Example Programs p B 1 The CNR4 outputs four voltages that typically range from 0 to 15 mV for the...

Page 27: ...iguration measuring two short wave radiation signals and two long wave signals all signals are measured separately Calculation of net radiation and albedo can be done online by the datalogger or offline by the user during post processing using the stored raw data The two pyranometers will measure the short wave radiation both incoming and reflected The two pyrgeometers will measure the long wave r...

Page 28: ... long wave far infrared irradiance E is done according to Equation 8 2 For the pyrgeometer only E V C 5 67 10 8 T4 8 2 In this equation C is the sensitivity of the sensor T is in Kelvin and not in Celsius or Fahrenheit The downward facing pyrgeometer measures the far infrared radiation that is emitted by the ground The upward facing pyrgeometer measures the far infrared radiation from the sky As t...

Page 29: ... 3504 3385 3270 3160 3054 2952 2854 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 When the heater and ventilator are on the largest expected deviation between the real sensor temperature and the thermistor reading is 1 degree This results in a worst case error for the pyrgeometer of 5 W m2 When th...

Page 30: ...9 40 89 80 90 19 90 59 90 98 91 37 91 77 92 16 92 55 92 95 93 34 93 73 94 12 94 52 94 91 95 30 95 69 96 09 96 48 96 87 97 26 97 65 98 04 98 44 98 83 99 22 99 61 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 100 00 100 39 100 78 101 17 101 56 101 95 102 34 102 73 103 12 103 51 103 90 104 29 104 68 105 07 105 46 105 85 106 24 106 63 107 02 107 40 107 79 108 18 108 5...

Page 31: ...short wave solar radiation will always be positive This can be used as a tool for quality assurance of your measured data 8 6 Calculation of Net Long wave Radiation The net long wave far infrared radiation is the part that contributes to heating or cooling of the earth s surface In practice usually the net long wave far infrared radiation will be negative Net Long wave Radiation E upper Pyrgeomete...

Page 32: ...is It can be performed both outdoors and indoors Indoors a lamp can be used as a source for both short wave and long wave radiation Outdoors one should preferably work with a solar elevation of more than 45 degrees 45 degrees above horizon and under stable conditions no large changes in solar irradiance and preferably no clouds 1 Measure the radiation outputs in the normal position Record the meas...

Page 33: ...y and the ambient air should be at the same temperature Let the pyrgeometer rest for at least five minutes to regain its thermal equilibrium Set the voltmeter to its most sensitive range To test if the pyrgeometer is working properly put your hand in front of the pyrgeometer The thermal radiation from your hand will cause the pyrgeometer to generate a positive voltage when the surface temperature ...

Page 34: ...rtridge The CNR4 has a drying cartridge inside the sensor to help keep the electronics dry The manufacturer recommends replacing the drying cartridge every 6 to 12 months The three screws holding the white solar shield and the six screws holding the aluminium base plate need to be removed to access the drying cartridge as shown in FIGURE 9 1 Make sure that the black rubber gasket is put in place p...

Page 35: ...nufacturer recommends the CNR4 be recalibrated on a regular schedule by an authorized Kipp Zonen calibration facility The CNR4 should be recalibrated every two years Alternatively one can check the sensor calibration by letting a higher standard run parallel to it over a two day period and then comparing the results For comparison of pyranometers one should use a clear day For comparison of pyrgeo...

Page 36: ...CNR4 Net Radiometer 26 ...

Page 37: ...hen saving the Short Cut program 2 Open CRBasic Editor 3 Click File Open Assuming the default paths were used when Short Cut was installed navigate to C CampbellSci SCWin folder The file of interest has the CR6 CR1 CR3 or CR5 extension Select the file and click Open 4 Immediately save the file in a folder different from C Campbellsci SCWin or save the file with a different file name Once the file ...

Page 38: ......

Page 39: ...tion pyrgeometer top Average corrected long wave radiation pyrgeometer bottom Average short wave net radiation Average long wave net radiation Average albedo Average net radiation CRBasic Example B 1 CR1000 Program Using Differential Measurements CR1000 Series Datalogger CNR4 program This program measures CNR4 four component net radiometer This program also measures the thermistor inside the CNR4 ...

Page 40: ...ottom W m 2 Units cnr4_T_C deg_C Units cnr4_T_K K Units LWTopC W m 2 Units LWBottomC 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 pyranometer_up_sensitivity 15 35 unique sensitivity for upper pyranometer microV W ...

Page 41: ...n_mult cnr4_mult 3 pyrgeometer_up_mult cnr4_mult 4 pyrgeometer_dn_mult Scan 1 Sec 3 0 PanelTemp logger_temp 250 Battery batt_volt CNR4 radiation measurements VoltDiff cnr4 4 mV25C 1 True 0 _60Hz cnr4_mult 0 CNR4 thermistor measurement BrHalf Vs_Vx 1 mV2500 16 Vx2 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 Ke...

Page 42: ...top Average corrected long wave radiation pyrgeometer bottom Average short wave net radiation Average long wave net radiation Average albedo Average net radiation CRBasic Example B 2 CR3000 Program Using Differential Measurements CR3000 Series Datalogger CNR4 program This program measures CNR4 four component net radiometer This program also measures the thermistor inside the CNR4 User must enter t...

Page 43: ...mC 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 pyranometer_up_sensitivity 15 35 unique sensitivity for upper pyranometer microV W m 2 Const pyranometer_dn_sensitivity 15 41 unique sensitivity for lower pyranomete...

Page 44: ...n_mult Scan 1 Sec 3 0 PanelTemp logger_temp 250 Battery batt_volt CNR4 radiation measurements VoltDiff cnr4 4 mV20C 1 True 0 _60Hz cnr4_mult 0 CNR4 thermistor measurement BrHalf Vs_Vx 1 mv5000 16 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_C 273 15 Correct the long wave radiation va...

Page 45: ...ranometer down Average long wave radiation pyrgeometer up Average long wave radiation pyrgeometer down Average CNR4 thermistor temperature degrees C Average CNR4 thermistor temperature Kelvin Average corrected long wave radiation pyrgeometer up Average corrected long wave radiation pyrgeometer down Average short wave net radiation Average long wave net radiation Average albedo Average net radiatio...

Page 46: ...ic Rn total net radiation Units logger_temp degC Units batt_volt volts Units SWTop W m 2 Units SWBottom W m 2 Units LWTop W m 2 Units LWBottom W m 2 Units cnr4_T_C deg_C Units cnr4_T_K K Units LWTopC W m 2 Units LWBottomC 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 sensitiv...

Page 47: ...mult 2 pyra_dn_mult cnr4_mult 3 pyrg_up_mult cnr4_mult 4 pyrg_dn_mult Scan 1 Sec 3 0 PanelTemp logger_temp 250 Battery batt_volt CNR4 radiation measurements VoltDiff cnr4 4 mV20C 1 True 0 _60Hz cnr4_mult 0 CNR4 thermistor 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 Kel...

Page 48: ...p Average corrected long wave radiation pyrgeometer down Average short wave net radiation Average long wave net radiation Average albedo Average net radiation TABLE B 1 Datalogger Connections for Differential Measurement with Pt 1001 Function Wire Color CR3000 CR5000 Pyranometer Up Signal Red Differential Input H Pyranometer Up Reference Blue2 Differential Input L Pyranometer Down Signal White Dif...

Page 49: ...low gnd jumper to 3L 4H CNR4 Pyrgeometer Lower signal brown 4L CNR4 Pyrgeometer Lower signal reference green gnd jumper to 4L CNR4 shield clear 8H CNR4 PRT Pt 100 signal green 8L CNR4 PRT Pt 100 signal reference yellow gnd CNR4 PRT Pt 100 shield clear CURRENT EXCITATION IX1 CNR4 PRT Pt 100 current excitation grey IXR CNR4 PRT Pt 100 current excitation return brown CNR4 sensor Public logger_temp ba...

Page 50: ...ty 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 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 LWTopC IEEE4 False Average 1 LWB...

Page 51: ...ong wave radiation values from pyrgeometers LWTopC LWTop 5 67e 8 cnr4_T_K 4 LWBottomC LWBottom 5 67e 8 cnr4_T_K 4 Compute short wave net radiation Rs_net SWTop SWBottom Compute long wave net radiation Rl_net LWTop LWBottom Compute albedo albedo SWBottom SWTop Compute net radiation Rn Rs_net Rl_net CallTable cnr4_data CallTable cnr4_ts NextScan EndProg ...

Page 52: ...Appendix B Example Programs B 14 ...

Page 53: ... vapor in the air which is a major contributor to the far infrared radiation TABLE C 1 Typical output signals of CNR4 under different meteorological conditions Explanation can be found in the text 1 2 3 4 5 6 7 8 9 10 Day night Cloudy clear 20ºC 20ºC Pyrgeo meter Up Pyrgeo meter low Pyrano meter up Pyrano meter low Pt 100 sky T ground T d cloud 20 0 0 0 500 0 150 20 20 20 d cloud 20 0 0 0 500 0 15...

Page 54: ...ith alternating cloud fields 180 170 160 150 140 130 120 110 100 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 19 00 00 20 00 00 21 00 00 22 00 00 23 00 00 0 00 00 pyrgeometer U_emf Sensitivity W m Temp YSI 44031 C Upper Pyrgeometer Day with Alter...

Page 55: ...ccount in the table In column 4 one might expect to see 0 to 50 for all positions that are showing 0 in column 5 the 0 values may in reality be 20 to 20 The resulting sky temperature is indicated in column 9 Under cloudy conditions this sky temperature is equal to ambient temperature Under clear conditions the sky temperature is lower than the ambient temperature The ground temperature in column 1...

Page 56: ...Appendix C CNR4 Performance and Measurements under Different Conditions C 4 4 1 8 10 67 5 CG3 upper E e Temperatur Sky C 1 4 1 8 10 67 5 CG3 lower E e Temperatur Ground C 2 ...

Page 57: ...determined and therefore are not specified D 1 General Information The primary reason for heating the sensor is to avoid 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 During a rain event this will probably not lead to significant errors because with an ...

Page 58: ...measurement inputs The heater power can be controlled by the datalogger program For example the datalogger program can turn on the heater only when the light level falls below 20 W m2 or if a measurement of air humidity is available when the dew point of the air falls to within 1ºC of the sensor body temperature Do not use the datalogger s switched 12 V channel to simultaneously power the heater a...

Page 59: ...onal CNF4 Heater Ventilator Unit to CNR4 1 The CNF4 heater ventilator unit comes with the following the heater ventilator the white solar shield three pan head screws with washers and four flat head screws as shown in FIGURE D 1 FIGURE D 1 CNF4 package contents ...

Page 60: ... unto the bottom of the CNR4 sensor using the three pan head screws and washers as shown in FIGURE D 2 Make sure that the pyranometer and the pyrgeometer windows are not scratched during the installation FIGURE D 2 Attaching the CNF4 to CNR4 using pan head screws and washers ...

Page 61: ...shown in FIGURE D 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 D 4 and FIGURE D 5 FIGURE D 3 Making sure the cables are clear from the edges FIGURE D 4 CNF4 solar shield and four flat head screws ...

Page 62: ... 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 location See FIGURE D 6 below FIGURE D 6 Affixing the sensor label to CNF4 5 Connect the heater ventilator power control cable and the mounting rod to the CNF4 as shown in FIGURE D 7 FIGURE D 7 Connecting ...

Page 63: ... m 164 ft cables TABLE D 1 Datalogger Connections for Differential Measurement with Heater Ventilator Control Function Wire Color CR6 CR1000 CR3000 Pyranometer Up Signal Red Differential Input H Pyranometer Up Reference Blue1 Differential Input L Pyranometer Down Signal White Differential Input H Pyranometer Down Reference Black1 Differential Input L Pyrgeometer Up Signal Grey Differential Input H...

Page 64: ...h or low respectively The program can be modified to include the conditional statements to control the heater and ventilator based upon the environmental parameters such as light level and dew point temperature CRBasic Example D 1 CR3000 Datalogger Program with Heater Ventilator Control CR3000 Series Datalogger CNR4 program This program measures CNR4 four component net radiometer This program also...

Page 65: ...WTopC Downwelling long wave radiation with temperature correction Public LWBottomC Upwelling long wave radiation with temperature correction Public Rs_net short wave net radiation Public Rl_net long wave net radiation Public albedo Albedo Public Rn total net radiation Units logger_temp degC Units batt_volt volts Units SWTop W m 2 Units SWBottom W m 2 Units LWTop W m 2 Units LWBottom W m 2 Units cn...

Page 66: ...s_net IEEE4 False Average 1 Rl_net IEEE4 False Average 1 albedo IEEE4 False Average 1 Rn IEEE4 False EndTable 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_mult cnr4_mult 2 pyranometer_dn_mult cnr4_mult 3 pyrgeometer_up_mult cnr4_mult 4 pyrgeometer_dn_m...

Page 67: ...tilator motor The value should be around 30 Ω cable resistance should add about 0 026 Ω per 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 cover at the bottom side of the ventilator unit by prying it open with a small flat head screw driver or by pulli...

Page 68: ...Appendix D CNF4 Heater Ventilator D 12 ...

Page 69: ......

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