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NR-LITE2 Net Radiometer

1. Introduction

The NR-LITE2 is a high-output thermopile sensor that measures the algebraic

sum of

incoming and outgoing all-wave radiation (both short-wave and long-

wave components). Incoming radiation consists of direct (beam) and diffuse

solar radiation plus long-wave

irradiance from the sky. Outgoing radiation

consists of reflected solar radiation plus the

terrestrial long-wave component.

The NR-LITE2 is equipped with PTFE-coated (polytetrafluoroethylene) sensor

surfaces. This results in a robust design

which provides easy maintenance and

good sensor stability. However, this design is slightly

less accurate than the

more traditional radiometers which use plastic domes.

This manual provides information only for CRBasic data loggers.

For retired Edlog data logger support, see an older manual at

www.campbellsci.com/old-manuals

2. Precautions

•

READ AND UNDERSTAND the

Safety

section at the front of this

manual.

•

Although the NR-LITE2 is rugged, it is also a highly precise scientific

instrument and should be handled as such.

•

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.

•

When installing the NR-LITE2, use only the support arm to rotate the NR-

LITE2. Using the sensor head to rotate the instrument may damage it.

3. Initial Inspection

•

Upon receipt of the NR-LITE2, 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 the cable. Check this information against the shipping

documents to ensure the correct product and cable length are received.

•

Refer to Section

3.1

Ships With

(p. 1)

, to ensure that parts are included.

3.1 Ships With

(1) WRR traceable calibration certificate

(1) Mounting arm from original manufacturer

(1) Bird stick from original manufacturer

NOTE

Содержание NR-LITE2

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: ...onmental 6 7 Installation 6 7 1 Siting Considerations 6 7 2 Mounting 7 7 3 Wiring 8 7 4 Data Logger Programming 9 7 4 1 Input Range and Integration 10 7 4 2 Calibration Factor 10 8 Operation 10 8 1 Electrical Properties 10 8 2 Spectral Properties 11 8 3 Directional Cosine Response 11 8 4 Sensitivity to Wind Speed 12 9 Maintenance and Troubleshooting 12 9 1 Maintenance 13 9 2 Troubleshooting 13 App...

Страница 6: ...he Net Radiation Sensor Mounting Kit 8 7 3 NR LITE2 to data logger connections 9 8 1 Electrical circuit for the NR LITE2 Net Radiometer 11 8 2 Cosine response of a typical net radiometer 12 Tables 7 1 Wire Color Function and Connections to the Data Logger 9 B 1 Wiring for CR3000 Example B 1 B 2 Wiring for CR1000X Example B 2 CRBasic Examples B 1 CR3000 Example Program without Wind Speed Correction...

Страница 7: ...ls 2 Precautions READ AND UNDERSTAND the Safety section at the front of this manual Although the NR LITE2 is rugged it is also a highly precise scientific instrument and should be handled as such 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 When installing the NR LITE2 use only the suppo...

Страница 8: ...asy way to program your data logger to measure the pyranometer and assign 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 shows using Short Cut to program the NR LITE2 1 Open Short Cut and click Create New Program 2 Double click the data logger model 3 In the Available Senso...

Страница 9: ...k the Wiring tab Click OK after wiring the sensor 5 Repeat steps three and four for other sensors you want to measure Click Next 6 In Output Setup type the scan rate a meaningful Table Name and Data Output Storage Interval Click Next ...

Страница 10: ... converted to a single output signal This output represents the net radiation which can be interpreted as meaning the radiative energy that is seen at the surface and is expressed in Watts per square meter W m 2 The NR LITE2 is designed for continuous outside use The sensor surfaces are coated with PTFE This ensures sensor stability long life and easy maintenance compared to the more usual radiome...

Страница 11: ...and CR9000 X 6 1 Spectral Spectral range 0 2 to 100 µm Detector type Thermopile Detector protection PTFE coating Detector profile Conical 6 2 Directional Directional error 0 to 60 C at 1000 W m 2 30 W m 2 Sensor asymmetry 5 typical 10 worst case 6 3 Mechanical Housing material Anodized aluminum Cable material Polyurethane Sensor weight 200 g 7 oz Physical dimensions FIGURE 6 1 Sensor 8 0 cm 3 1 in...

Страница 12: ...r reflections will be cast on it at any time of day from obstructions such as trees buildings the mast or structure on which it is mounted 1 in FIGURE 7 1 2 To avoid shading or reflection effects and to promote spatial averaging the NR LITE2 should be mounted at least 1 5 m above the ground or crop surface It is recommended that the NR LITE2 be mounted to a separate vertical pipe at least 25 ft fr...

Страница 13: ...lock 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 FIGURE 7 2 4 Perform a coarse leveling of the sensor using the sensor bubble level 5 in FIGURE 7 1 5 Tighten the four screws on top of the mounting bracket to properly secure the support arm so that it does not rotate FIGURE 7 2 Do not attempt to rotat...

Страница 14: ...ensor Mounting Kit 7 3 Wiring The NR LITE2 can be measured with a differential or single ended terminal on the data logger a differential terminal is recommended FIGURE 7 3 provides the NR LITE2 wiring Data logger connections are shown in TABLE 7 1 Support Arm Mounting Bracket Pole Support Arm Mounting Bracket Crossarm ...

Страница 15: ... supplied wire 7 4 Data Logger Programming Short Cut is the best source for up to date data logger programming code If your data acquisition requirements are simple you can probably create and maintain a data logger program exclusively with Short Cut If your data acquisition needs are more complex the files that Short Cut creates are a great source for programming code to start a new program or ad...

Страница 16: ...ed in the data logger program Always cross check to ensure that the serial number of the NR LITE2 and the number on the calibration certificate are identical The serial number and sensitivity are also shown on a small label attached to the connecting arm near the head of the sensor itself When using Short Cut to generate a program you are prompted for the calibration factor Input the factor listed...

Страница 17: ...mptions are made The downward facing sensor has the same sensitivity However since the two sensors may not be perfectly symmetrical this assumption may not always be true but differences are small The NR LITE2 sensitivity is the same for both solar and infrared radiation 8 3 Directional Cosine Response The measurement of the radiation falling on a surface also known as irradiance or radiative flux...

Страница 18: ...ity is less than 1 of reading per meter per second wind speed and the effect is essentially independent of the radiation level Net radiation readings can be corrected for wind speed sensitivity using the following equation which was developed by Jerry Brotzge at the Oklahoma Climate Survey Wind Sensitivity equation for the NR LITE2 Rn cor Rn obs U 5 m s 1 Rn cor Rn obs 1 0 A U 5 0 U 5 m s 1 Where ...

Страница 19: ...ve range on the voltmeter 3 With the lamp switched off read the sensor output signal allow a minute or so for the signal to fully stabilize 4 Switch on the lamp The sensor should now produce a higher positive reading 5 Turn the lamp off again the signal should slowly return to its original level proving the sensor s sensitivity to light 6 Turn the sensor upside down The signal value should reverse...

Страница 20: ...d and blue wires The impedance reading should be close to 2 3Ω If it is virtually zero a short circuit is indicated If it is infinite the thermopile is damaged If your readings are not as expected check the following 1 Under full sunlight the expected radiation value is about 1000 W m 2 Under lamps it may be greater For indoor climate studies smaller values are to be expected unless solar radiatio...

Страница 21: ...the CRBasic 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 t...

Страница 22: ...l Reference 1L Jumpered to Black Shield CRBasic Example B 1 CR3000 Example Program without Wind Speed Correction CR3000 Declare Variables and Units Public BattV Public NR_Wm2 Units BattV Volts Units NR_Wm2 W meter 2 Define Data Tables DataTable Hourly True 1 DataInterval 0 60 Min 10 Average 1 NR_Wm2 FP2 False EndTable DataTable Daily True 1 DataInterval 0 1440 Min 10 Minimum 1 BattV FP2 False Fals...

Страница 23: ...lue Signal Reference 2L Jumpered to Black Shield CRBasic Example B 2 CR1000X Example Program with Wind Speed Correction CR1000X Declare Variables and Units Public BattV Public WS_ms Public WindDir Public NR_Wm2 Public CNR_Wm2 Units BattV Volts Units WS_ms meters second Units WindDir Degrees Units NR_Wm2 W m 2 Units CNR_Wm2 Watts meter 2 Define Data Tables DataTable Hourly True 1 DataInterval 0 60 ...

Страница 24: ...f WindDir 360 Then WindDir 0 NR LITE2 Net Radiometer dynamic wind speed correction measurement NR_Wm2 and CNR_Wm2 Note that the calibration factor in the Volt_Diff instruction is specific to each sensor VoltDiff NR_Wm2 1 mv200 2 True 0 60 63 29 0 If WS_ms 5 Then CNR_Wm2 NR_Wm2 1 0 021286 WS_ms 5 Else CNR_Wm2 NR_Wm2 EndIf Call Data Tables and Store Data CallTable Hourly CallTable Daily NextScan End...

Страница 25: ...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 de South Africa Location Stellenbosch South Africa Phone 27 21 8809960 Email sales campbellsci co za Website www campbellsci co za Southeast Asia Location Bangkok Thailand Phone 66 2 719 3399 Email thitipongc campbellsci...

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