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9. Maintenance and Recalibration

................................ 29

9.1 Cleaning Windows and Domes .............................................................. 29

9.2 Recalibration .......................................................................................... 29

9.3 Replacing the Drying Cartridge .............................................................. 30

9.4 Replacement Parts .................................................................................. 30

Appendices

A. CNR4 Performance and Measurements under

Different Conditions

............................................. A-1

B. CNF4 Heater/Ventilator

........................................... B-1

B.1 General Information ............................................................................. B-1

B.2 Attaching the Optional CNF4 Heater/Ventilator Unit to CNR4 .......... B-2

B.3 Wiring .................................................................................................. B-6

B.4 Example B, CR3000 Datalogger Program with Heater/Ventilator

Control ............................................................................................. B-7

B.5 CNF4 Heater/Ventilator Maintenance ............................................... B-10

B.5.1 Testing the Heater .................................................................... B-10

B.5.2 Testing the Ventilator ............................................................... B-10

B.5.3 Replacing the Filter for the Ventilator ..................................... B-10

C. CR3000 Program for Measuring Pt-100

Temperature Sensor

............................................. C-1

Figures

2-1. The CNR4 net radiometer with cables and mounting rod, top view ....... 2

2-2. The CNR4 net radiometer with CNF 4 heater/ventilator 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 and TEMP cables ............................... 14

6-2. The marks on the end of the CNR4: S for SOLAR cable, and T for

TEMP cable ....................................................................................... 14

6-3. Labels on the pigtail end of the SOLAR cable...................................... 15

6-4. Labels on the pigtail end of the TEMP cable ........................................ 15

9-1. Replacing the Drying Cartridge ............................................................ 30

A-1. Different measurement conditions and signals .................................. A-2

A-2. Partly cloudy day for the upward facing pyrgeometer ....................... A-2

A-3. Clear day for the downward facing pyrgeometer ............................... A-3

B-1. CNF4 Package Contents ..................................................................... B-2

B-2. Attaching the CNF4 to CNR4 using pan-head screws and washers ... B-3

B-3. Making sure the cables are clear from the edges ................................ B-4

B-4. CNF4 solar shield and four flat-head screws ..................................... B-4

B-5. Attaching the solar shield to CNF4 using four flat-head screws ........ B-5

B-6. Affixing the sensor label to CNF4...................................................... B-5

B-7. Connecting the CNF4 power control cable and the mounting rod ..... B-5

Содержание CNR4

Страница 2: ......

Страница 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...

Страница 4: ......

Страница 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...

Страница 6: ......

Страница 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...

Страница 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...

Страница 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...

Страница 10: ...iv...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 59: ......

Страница 60: ...rta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc i...

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