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Appendix C. CNF4 Heater/Ventilator

C-9

the CNR4 should be connected to the 12V terminal. An A21REL-12 can be

used to switch 12V to reduce current consumption. An example program that

measures the CNR4, controls the heater/ventilator using measurements

provided by the EE181 temperature and relative humidity sensor, measures the

tachometer, and uses the A21REL-12 to switch 12V power is provided at

www.campbellsci.

/downloads/cnr4-cnf4-example-program

C.5 CNF4 Heater/Ventilator Maintenance

C.5.1 Testing the Heater

The optional CNF4 consists of a heater and a ventilator. To check the heater

unit, measure the resistance between the two heater wires (green and yellow).

The resistance value of the heating resistor inside should be around 15

Ω

(cable

resistance should add about 0.026

Ω

per each foot of cable). An infinite

resistance reading indicates the likelihood of a broken wire, or cable.

C.5.2 Testing the Ventilator

To check the ventilator, first measure the impedance of the ventilator 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 malfunctions, 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

pulling it straight out. Inspect the fan inside for any object that might impede

the fan rotation. Upon completing the inspection, put the filter and the cover

back in place.

C.5.3 Replacing the Filter for the Ventilator

The filter needs to be checked for every 6 to 12 months. Remove the black

cover at the bottom side of the ventilator by prying it open with a small flat-

head screw driver or by pulling it straight out. Inspect the filter for dust and

particles that might impede the air flow into the ventilator. The filter can be

cleaned with warm clean water, or can be replaced with the new one. You can

purchase the replacement filters from Campbell Scientific.

Содержание CNR4

Страница 2: ......

Страница 3: ...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 can be give...

Страница 4: ......

Страница 5: ...digital 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 marke...

Страница 6: ......

Страница 7: ...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 cl...

Страница 8: ......

Страница 9: ...ions 9 7 2 Mounting 9 7 3 Wiring 11 7 4 Data Logger Programming 14 7 4 1 Sensor Sensitivity 15 7 4 2 Internal Temperature Sensors Programming 15 8 Operation 16 8 1 Short wave Solar Radiation Measureme...

Страница 10: ...dy 10 7 2 Attaching the CNR4 onto the mounting rod using vertical pole or horizontal crossarm 10 7 3 The CNR4 sensor with SOLAR and TEMP cables 12 7 4 The marks on the end of the CNR4 S for SOLAR cabl...

Страница 11: ...rsus CNR4 thermistor temperature in C 18 8 2 Resistance values versus CNR4 Pt 100 temperature in C 19 B 1 Typical output signals of CNR4 under different meteorological conditions Explanation can be fo...

Страница 12: ......

Страница 13: ...y 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 t...

Страница 14: ...0W PC400 or RTDAQ The following procedure also describes programming with Short Cut 1 Open Short Cut and create a new program 2 Double click the data logger model 3 In the Available Sensors and Device...

Страница 15: ...ab to see how the sensor is to be wired to the data logger Click OK after wiring the sensor 5 Repeat steps three and four for other sensors Click Next 6 In Output Setup enter the scan rate Data Output...

Страница 16: ...ally for optimal accuracy Two temperature sensors a thermistor and a Pt 100 are integrated with the CNR4 body The temperature sensor is used to provide information to correct the infrared readings for...

Страница 17: ...reduces formation of dew and melts frost Separate outputs of short wave and long wave infrared radiation for better accuracy and more thorough quality assurance Solar shield reduces thermal effects o...

Страница 18: ...n Requirements for data acquisition Radiation components Thermistor Pt 100 temperature Four probes with unique sensitivity values Please refer to the calibration sheets or label on the bottom of the s...

Страница 19: ...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...

Страница 20: ...re 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 Uncertain...

Страница 21: ...as trees buildings or the mast or structure on which it is mounted If the instrument is h metres above the surface 99 of the input of the lower sensors comes from a circular area with a radius of 10h...

Страница 22: ...unting 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 incomin...

Страница 23: ...o spring loaded levelling screws one on the front and the other on the back of the bracket 7 Route the sensor cable to the instrument enclosure 8 Use the UV resistant cable ties included with the trip...

Страница 24: ...ential terminals are not available single ended measurements can be used The acceptability of a single ended measurement can be determined by comparing the results of single ended and differential mea...

Страница 25: ...Black Pyranometer Bottom Reference U configured for differential low analogue input1 2 DIFF L differential low analogue voltage input 2 analogue ground Grey Pyrgeometer Top Signal U configured for di...

Страница 26: ...ured for voltage excitation2 EX VX voltage excitation N A Black Thermistor Reference analogue ground N A Green PRT Pt 100 Signal N A U configured for differential high analogue input2 DIFF H different...

Страница 27: ...by the manufacturer They show the sensor serial number and sensitivity values for four individual probes one copy for pyranometers and another copy for pyrgeometers The serial number and sensitivity v...

Страница 28: ...ed in Section 8 3 Internal Temperature Sensors Measurements p 17 In the four separate components mode configuration measuring two short wave radiation signals and two long wave signals all signals are...

Страница 29: ...eter sensing element and has therefore the same temperature as the pyrgeometer sensor surface The calculation of the long wave far infrared irradiance E is done according to Equation 8 2 For the pyrge...

Страница 30: ...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 v...

Страница 31: ...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 57 108 96 109 35 109 73 110 12 110 51 110 90 111 28 30 31 32 33 34 35 36 37 38 39 40 41 42 43 4...

Страница 32: ...the net long wave far infrared radiation will be negative Net Long wave Radiation E upper Pyrgeometer E lower Pyrgeometer 8 5 In Equation 8 5 E is calculated according to Equation 8 2 According to Equ...

Страница 33: ...lar 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 p...

Страница 34: ...meter 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...

Страница 35: ...urer 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...

Страница 36: ...od and then comparing the results For comparison of pyranometers one should use a clear day For comparison of pyrgeometers one should compare the nighttime results If the deviations are greater than 6...

Страница 37: ...can now be edited for additional refinement Once the file is edited with CRBasic Editor Short Cut can no longer be used to edit the program it created 2 To add the Short Cut wiring information into t...

Страница 38: ......

Страница 39: ...vapour in the air which is a major contributor to the far infrared radiation TABLE B 1 Typical output signals of CNR4 under different meteorological conditions Explanation can be found in the text 1 2...

Страница 40: ...th 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...

Страница 41: ...count 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 co...

Страница 42: ...Appendix B CNR4 Performance and Measurements under Different Conditions B 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...

Страница 43: ...determined and therefore are not specified C 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 do...

Страница 44: ...the data logger not to an analogue ground near the measurement inputs The heater power can be controlled by the data logger program For example the data logger program can turn on the heater only when...

Страница 45: ...nal 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 sc...

Страница 46: ...unto the bottom of the CNR4 sensor using the three pan head screws and washers as shown in FIGURE C 2 Make sure that the pyranometer and the pyrgeometer windows are not scratched during the installati...

Страница 47: ...hown in FIGURE C 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 C 4 and FIGURE C 5 FIGURE C...

Страница 48: ...ial 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 anodized aluminium base so that the label is in a visible loca...

Страница 49: ...ons for Differential Measurement with Heater Ventilator Control Function Wire Colour Data Logger Terminal Pyranometer Up Signal Red U configured for differential input1 DIFF H differential high analog...

Страница 50: ...not in use and tie them around the TEMP cable using a cable tie or electrical tape to avoid possible damage to the Pt 100 due to electrical short circuit Do not use the data logger switched 12 V to si...

Страница 51: ...check the ventilator first measure the impedance of the ventilator motor The value should be around 30 cable resistance should add about 0 026 per each foot of cable If the correct resistance value i...

Страница 52: ...cennes France Phone 0033 0 1 56 45 15 20 Email info campbellsci fr Website www campbellsci fr Germany Location Bremen Germany Phone 49 0 421 460974 0 Email info campbellsci de Website www campbellsci...

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