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C-1

Appendix C. CVF4 Ventilation Unit

C.1 General Information

Ventilation of radiometers improves the reliability and accuracy of the

measurement by reducing dust, raindrops and dew on the dome. With

thermopile-based instruments ventilation stabilizes the temperature of the

radiometer and suppresses thermal offsets. The integrated heater can be used to

disperse precipitation and melt frost, or even melt snow and ice in cold

climates.

CVF4 is a low power, low maintenance ventilation unit. The only part that

needs maintenance is the removable air inlet filter, which should be checked at

regular intervals and cleaned or replaced when necessary.

The flow that the CVF4 creates is unique. At the top of the pyranometer dome

the flow is high and it swirls to improve the air distribution over the dome. The

position of the heaters and the cover material ensure only half the heating

power is needed to melt frost and snow compared to older ventilation units.

CVF4 is designed to be used with Kipp & Zonen:

•

CMP / SMP pyranometers

•

CGR 4 pyrgeometer

•

CUV 5 total UV radiometer

CVF4 can be mounted on the 2AP and SOLYS 2 sun trackers.

CVF4 replaces the successful and widely used CVF3 ventilation unit.

The CVF4 is meant to run continuously. The heater can either be powered on

continuously for cold regions or be switched on by a Campbell Scientific data

logger to remove dew in the morning and be switched off afterwards. In that

case, the heater could operate for a period of time before and after sunrise. This

saves power in situations where power is limited, such as PV operated systems.

The CVF4 is manufactured by Kipp & Zonen and cabled by

Campbell Scientific. The wiring of a CVF4 purchased from

Campbell Scientific is different than the wiring of a CVF4

purchased directly from Kipp & Zonen.

C.2 CVF4 Components

FIGURE

C-1

and FIGURE

C-2

show the components of the CVF4. It is

shipped with a cover, power cable, eight washers, four screws, Allen wrench,

and five spare filters (FIGURE

C-3

NOTE

Содержание CMP10

Страница 2: ...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...

Страница 3: ...ping 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 9...

Страница 4: ...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...

Страница 5: ...ounting to a Tripod or Tower 10 7 3 Wiring 11 7 4 Programming 13 7 4 1 Solar Radiation Measurements 13 7 4 1 1 Input Range 13 7 4 1 2 Multiplier 14 7 4 1 3 Offset 14 7 4 1 4 Output Format Considerations 15 7 4 2 CMP21 Internal Thermistor Measurement 15 8 Maintenance Troubleshooting 15 8 1 Maintenance 15 8 1 1 Changing the Desiccant 16 8 1 2 Check Sensor Output 17 8 2 Recalibration 17 8 3 Troublesh...

Страница 6: ... 2 CVF4 Components bottom view C 2 C 3 CVF4 Ventilation Unit and Ships With Kit C 3 C 4 Crossarm and Nu Rail Crossover Fitting Mounted to Mast exploded view C 4 C 5 CM220 Right Angle Mounting Bracket attached to CM200 series crossarm C 4 C 6 Mounting CVF4 feet to a mounting stand C 5 C 7 Mounting the pyranometer to the CVF4 C 5 C 8 CVF4 Mounted to CVF4 Mounting Stand pyranometer not shown C 6 C 9 ...

Страница 7: ...iii CRBasic Examples B 1 CR1000X Example Program for Measuring a CMP6 B 1 B 2 CR1000X Example Program for Measuring a CMP10 or CMP11 B 2 B 3 CR1000X Example Program for Measuring a CMP21 B 3 C 1 CVF4 Example Program C 10 ...

Страница 8: ...recision scientific instruments Care should be taken when opening the shipping package to not damage or cut the cable jacket If damage to the cable is suspected contact Campbell Scientific Pyranometers purchased from Campbell Scientific have different wiring than pyranometers purchased directly from Kipp Zonen 3 Initial Inspection Check the contents of the shipment If there is a shortage see Secti...

Страница 9: ... the data logger to measure the pyranometer and assign data logger wiring terminals Short Cut is available as a download on www campbellsci com It is included in installations of LoggerNet PC200W PC400 or RTDAQ The following procedure also describes using Short Cut to program the pyranometer 1 Open Short Cut and click Create New Program 2 Double click the data logger model 3 In the Available Senso...

Страница 10: ...CMP6 CMP10 CMP11 and CMP21 Pyranometers 3 4 Repeat step three for other sensors 5 In Output Setup type the scan rate meaningful table names and the Data Output Storage Interval ...

Страница 11: ...rovided in TABLE 5 1 Refer to Section 6 Specifications p 5 for accuracy and performance information for each model TABLE 5 1 Model Comparison Characteristic CMP6 CMP10 CMP11 CMP21 ISO Classification First Class Secondary Standard Secondary Standard Secondary Standard Internal thermistor Dome dew prevention method1 Drying cartridge with desiccant Section 8 1 1 Changing the Desiccant p 16 Internal d...

Страница 12: ...me free from ice and dew see Appendix C CVF4 Ventilation Unit p C 1 In some applications the CVF4 may also reduce the deposition of dust on the dome and therefore reduce the cleaning interval frequency 6 Specifications Features Double glass dome Integrated bubble level is visible without removing sun shield Measures reflected solar radiation when inverted Desiccant filled drying cartridge prevents...

Страница 13: ...ure 40 to 80 C Temperature dependence of sensitivity 4 10 to 40 C 1 10 to 40 C 1 20 to 50 C Sensitivity 5 to 20 µV W m 2 7 to 14 µV W m 2 Typical signal output for atmospheric applications 0 to 20 mV 0 to 15 mV Weight 0 6 kg 1 3 lb without cable 0 9 kg 2 lb with 10 m 33 ft cable Impedance1 20 to 200 Ω 10 to 100 Ω 1 Impedance is defined as the total electrical impedance at the radiometer output con...

Страница 14: ...t on the sensor surface Site the pyranometer to allow easy access for maintenance while ideally avoiding any obstructions or reflections above the plane of the sensing element It is important to mount the pyranometer such that a shadow or reflection will not be cast on it at any time If this is not possible try to choose a site where any obstruction over the azimuth range between earliest sunrise ...

Страница 15: ...6 CMP10 CMP11 and CMP21 Pyranometers 8 FIGURE 7 1 Pyranometer installation FIGURE 7 2 Pyranometer mounted horizontally for the Northern Hemisphere left and Southern Hemisphere right CM2XX Series Crossarm h ...

Страница 16: ...CMP6 CMP10 CMP11 and CMP21 Pyranometers 9 FIGURE 7 3 Two views of a pyranometer mounted at an angle for the Northern Hemisphere FIGURE 7 4 Pyranometer mounted at an angle for the Southern Hemisphere ...

Страница 17: ...S can be adjusted to any angle from horizontal to vertical If mounting the pyranometer at an angle ensure that the crossarm is leveled horizontally before placing the bracket at its proper angle Refer to the 015ARM CM225 CM255 CM255LS CM260 and CM265 Solar Radiation Sensor Mounts manual for more information Do the following to level the pyranometer horizontally FIGURE 7 5 1 Attach the mounting sta...

Страница 18: ...en in TABLE 7 1 CMP6 CMP10 and CMP11 and TABLE 7 2 CMP21 Solar radiation can be measured by using either differential or single ended analog terminals The differential measurement has better noise rejection and is therefore recommended For differential measurements a user supplied jumper wire needs to be connected between the low side of the differential input and ground to keep the signal in comm...

Страница 19: ...ction Differential Data Logger Connection Terminal Single Ended Data Logger Connection Terminal White Pyranometer Signal High 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 Blue Pyranometer Signal Reference U configured for differential input1 2 DIFF L differential low analog voltag...

Страница 20: ...e Programs p B 1 7 4 1 Solar Radiation Measurements Solar radiation can be reported as an average flux density W m 2 or daily total flux density MJ m 2 The appropriate multipliers are listed in TABLE 7 3 Programming examples are given for both average and daily total solar radiation The pyranometers output a low level voltage ranging from 0 to a maximum of up to 20 mV in natural light depending on...

Страница 21: ...late the multiplier to give the readings in W m 2 M 1000 c Where M multiplier c sensor output in µV W m 2 Other units can be used by adjusting the multiplier as shown in TABLE 7 3 TABLE 7 3 Multipliers Required for Flux Density and Total Fluxes Units Multiplier Output Processing W m 2 M Average MJ m 2 M t 0 000001 Totalize kJ m 2 M t 0 001 Totalize cal cm 2 M t 0 0239 0 001 Totalize cal cm 2 min 1...

Страница 22: ...onverts resistance to temperature in degree Celsius Temperature 1 A B ln resistance C ln resistance 3 273 15 Where A B and C are coefficients for the Steinhart Hart equation The coefficients for the Steinhart Hart equation are specific to the thermistor contained in your CMP21 A calibration certificate that lists these coefficients is shipped with each CMP21 pyranometer 8 Maintenance Troubleshooti...

Страница 23: ...ge and opaque Replace the desiccant granules when they become translucent normally after several months Refill packs of desiccant are shipped with the pyranometer and can be purchased from Campbell Scientific The drying cartridge uses the content of one refill pack FIGURE 8 2 shows the replacement process When changing the desiccant ensure that Surfaces touching the rubber O ring are clean Dirt in...

Страница 24: ...hooting Symptom NAN 9999 or radiation values around 0 1 Check that the sensor is wired to the differential terminal specified by the measurement instruction 2 Verify that the range code is correct for the data logger type 3 Measure the impedance across the white and black sensor wires This should be around 100 ohms plus the cable resistance typically 0 1 ohm m 1 If the resistance is low there may ...

Страница 25: ...RBasic program This program 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 the new CRBasic program open the DEF file located in the C campbellsci SCWin folder and copy the wiring information which is at the beginning of the DEF file 3 Go into the CR...

Страница 26: ...BLE B 1 CR1000X Wiring for CMP6 Example Program Wire Color Description CR1000X Jumper1 White Solar Signal 1H Black Solar Signal 1L Clear Shield 1 Jumper 1L to with user supplied 26 AWG or larger wire CRBasic Example B 1 CR1000X Example Program for Measuring a CMP6 CR1000X Series Data Logger Public PTemp Public Batt_Volt Public CMP6_Irr Units CMP6_Irr W m2 DataTable TenMin 1 1 DataInterval 0 10 Min...

Страница 27: ...am Wire Color Description CR1000X Jumper1 White Solar Signal 2H Black Solar Signal 2L Clear Shield 1 Jumper 2L to with user supplied 26 AWG or larger wire CRBasic Example B 2 CR1000X Example Program for Measuring a CMP10 or CMP11 CR1000X Series Data Logger Public PTemp Public Batt_Volt Public CMP11_Irr Units CMP11_Irr W m2 DataTable TenMin 1 1 DataInterval 0 10 Min 10 Minimum 1 Batt_Volt FP2 0 Fal...

Страница 28: ...Wiring for CMP21 Example Program Wire Color Description CR1000X Jumper1 White Solar Signal 3H Blue Solar Signal 3L Yellow Voltage Excitation VX1 Black Temp Signal 15 SE Brown Signal Reference Clear Shield 1 Jumper 3L to with user supplied 26 AWG or larger wire CRBasic Example B 3 CR1000X Example Program for Measuring a CMP21 CR1000X Series Data Logger Public PTemp Public Batt_Volt Public CMP21_Irr...

Страница 29: ...ter Multiplier M 1000 c where c 8 65 VoltDiff CMP21_Irr 1 mV200C 3 True 10000 60 1000 8 65 0 CMP21 Thermistor Measurement BrHalf Vs_Vx 1 mV5000 15 Vx1 1 2500 True 0 250 1 0 0 Rs 1000 Vs_Vx 1 Vs_Vx CMP21_T_C 1 1 0295e 3 2 391e 4 LN Rs 1 568e 7 LN Rs 3 273 15 Convert CMP21 temp to Kelvin CMP21_T_K CMP21_T_C 273 15 CallTable TenMin NextScan EndProg ...

Страница 30: ...s needed to melt frost and snow compared to older ventilation units CVF4 is designed to be used with Kipp Zonen CMP SMP pyranometers CGR 4 pyrgeometer CUV 5 total UV radiometer CVF4 can be mounted on the 2AP and SOLYS 2 sun trackers CVF4 replaces the successful and widely used CVF3 ventilation unit The CVF4 is meant to run continuously The heater can either be powered on continuously for cold regi...

Страница 31: ...F4 Components top view no cover FIGURE C 2 CVF4 Components bottom view Heater Ventilator Cover Nut Pyranometer Mounting Holes Heater CVF4 Cable Connector Pyranometer Cable Slot Cover Nut Connector Box Mounting Feet Cover Nut Mounting Feet Filter Cover ...

Страница 32: ...ounting hardware The CVF4 is mounted to a crossarm by using the CVF4 Mounting Stand and either the CM220 Right Angle Mounting Bracket or the 1 inch by 1 inch Nu Rail Crossover Fitting Refer to the Kipp Zonen Instruction Manual if mounting the CVF4 to a SOLYS 2 Solar Tracker or to a CM 121C Shadow Ring Tools required for mounting to a tripod or tower are Allen wrench supplied with the CVF4 8 mm 5 1...

Страница 33: ...e Mounting Bracket FIGURE C 5 or a 1 inch by 1 inch Nu Rail Crossover Fitting FIGURE C 4 to the crossarm FIGURE C 5 CM220 Right Angle Mounting Bracket attached to CM200 series crossarm U bolt Washers CM210 Bracket included with crossarm U bolt Nuts Nu Rail Crossover Fitting CM200 series Crossarm U bolts CM220 Right Angle Bracket U bolt for Attaching the CVF4 Mounting Stand U bolt for Attaching the...

Страница 34: ...ng holes 4 Fasten the CVF4 feet to the mounting stand by using the supplied washers and screws FIGURE C 6 FIGURE C 6 Mounting CVF4 feet to a mounting stand 5 Loosely mount the pyranometer on the CVF4 by using the mounting screws and washers Do not fully tighten the pyranometer two mounting screws FIGURE C 7 FIGURE C 7 Mounting the pyranometer to the CVF4 Pyranometer Mounting Screw Nylon Washer Lev...

Страница 35: ...necessary 8 Route the pyranometer cable through the cable notch 9 Fit the white cover onto the CVF4 and secure it with the cover nuts see FIGURE C 8 FIGURE C 8 CVF4 Mounted to CVF4 Mounting Stand pyranometer not shown 10 Attach the power cable to the CVF4 connector 11 Route the cables along the underside of the crossarm to the tower tripod mast and to the instrument enclosure 12 Secure the cables ...

Страница 36: ...red for pulse input1 P pulse input C control port or P_SW pulse switch closure input Clear Shield analog ground 1 U and C terminals are automatically configured by the measurement instruction TABLE C 2 CVF4 4 Pin Wiring Wire Color Description Power Supply Connection Data Logger Connection Red Ventilator Power 12V White Heater Power 12V Black Power Ground G Green Tachometer Signal U configured for ...

Страница 37: ...Appendix C CVF4 Ventilation Unit C 8 C 4 1 Schematics FIGURE C 9 8 Pin Schematic ...

Страница 38: ... the CVF4 heater is switched using one SPST Single Channel Solid State Relay FIGURE C 10 In the beginning of the program the sensitivity of the CMP11 is entered as a constant Wiring for the example is shown in Table C 3 TABLE C 3 Wiring for Program Controlling CVF4 Heater Function CMP11 Wire Color 109 Wire Color CVF4 Wire Color Relay Power Supply Terminal CR1000X Terminal CMP11 Signal High White 1...

Страница 39: ...Series Data Logger Example program for CVF4 Declare Public Variables Public PTemp batt_volt Public GH_Irradiance_CMP11 Public CVF4_Tach Public SolarPos 5 Public Airtemp Public TimeArray 9 Declare Constants Const CMP11_Sensitivity 12 5 Const Latitude 41 767561 Const Longitude 111 85592 Const Altitude 1358 Define Aliases Alias SolarPos 1 SolarAzimuth Alias SolarPos 2 SunElevation Alias SolarPos 3 Ho...

Страница 40: ...per revolution Control the CVF4 Heater If SunElevation 10 AND SunElevation 10 Then PortSet C1 1 Else PortSet C1 0 EndIf CallTable Ten_Min NextScan EndProg C 6 CVF4 Heater Ventilator Maintenance 1 Refer to Section 8 1 Maintenance p 15 for the pyranometer maintenance 2 Inspect the area directly under the fan to ensure that it is free from leaves snow or other obstructions that can inhibit air flow 3...

Страница 41: ...Discoloration of the plastic cover does not affect the operation of the CVF4 The cover only needs to be cleaned for aesthetic reasons FIGURE C 11 CVF4 filter replacement NOTE Ventilator Diagonal Line Cover Diagonal Line Filter Filter Cover ...

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