Campbell Scientific NR-LITE2 User Manual

NR-LITE2 Net Radiometer

Revision: 3/13

Copyright © 1998-2013

Campbell Scientific, Inc.

Warranty

“PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC, INC. are
warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in
materials and workmanship under normal use and service for twelve (12)
months from date of shipment unless otherwise specified in the corresponding
Campbell pricelist or product manual. Products not manufactured, but that are
re-sold by Campbell, are warranted only to the limits extended by the original
manufacturer. Batteries, fine-wire thermocouples, desiccant, and other
consumables have no warranty. Campbell’s obligation under this warranty is
limited to repairing or replacing (at Campbell’s option) defective products,
which shall be the sole and exclusive remedy under this warranty. The
customer shall assume all costs of removing, reinstalling, and shipping
defective products to Campbell. Campbell will return such products by surface
carrier prepaid within the continental United States of America. To all other
locations, Campbell will return such products best way CIP (Port of Entry)
INCOTERM® 2010, prepaid. 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 of all other
warranties, expressed or implied. The warranty for installation services
performed by Campbell such as programming to customer specifications,
electrical connections to products manufactured by Campbell, and product
specific training, is part of Campbell’s product warranty. CAMPBELL
EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. Campbell is not liable for any special, indirect,
incidental, and/or consequential damages.”

Assistance

Products may not be returned without prior authorization. The following
contact information is for US and international customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit

www.campbellsci.com to determine which Campbell Scientific company serves

your country.

To obtain a Returned Materials Authorization (RMA), contact CAMPBELL
SCIENTIFIC, INC., phone [phone]. After an applications engineer
determines the nature of the problem, an RMA number will be issued. Please
write this number clearly on the outside of the shipping container. Campbell
Scientific’s shipping 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 web site at www.campbellsci.com/repair. A
completed form must be either emailed to [e-mail] or faxed to
[phone]. Campbell Scientific is unable to process any returns until we
receive this form. If the form is not received within three days of product
receipt or is incomplete, the product will be returned to the customer at the
customer’s expense. Campbell Scientific reserves the right to refuse service on
products that were exposed to contaminants that may cause health or safety
concerns for our employees.

Table of Contents

PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.

1. Introduction.................................................................1

2. Cautionary Statements............................................... 1

3. Initial Inspection .........................................................1

3.1 Ships With............................................................................................2

4. Quickstart .................................................................... 2

4.1 Siting Considerations ...........................................................................2

4.2 Mounting..............................................................................................3

4.3 Use SCWin to Program Datalogger and Generate Wiring Diagram....4

5. Overview......................................................................8

5.1 Electrical Properties .............................................................................8

5.2 Spectral Properties ...............................................................................9

5.3 Directional/Cosine Response ...............................................................9

5.4 Sensitivity to Wind Speed ..................................................................10

6. Specifications ...........................................................11

6.1 Spectral...............................................................................................12

6.2 Directional..........................................................................................12

6.3 Mechanical.........................................................................................12

6.4 Environmental....................................................................................12

7. Operation...................................................................13

7.1 Wiring ................................................................................................13

7.2 Datalogger Programming...................................................................14

7.2.1 Input Range and Integration........................................................14

7.2.2 Calibration Factor .......................................................................14

7.2.3 Example Programs ......................................................................15

7.2.3.1 CR3000 Example Program without Wind Speed

Correction .....................................................................15

7.2.3.2 CR1000 Example Program with Wind Speed

Correction .....................................................................16

7.2.3.3 CR10(X) Example Program without Wind Speed

Correction .....................................................................17

7.2.3.4 CR10X Example Program with Wind Speed

Correction .....................................................................18

8. Maintenance ..............................................................20

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Table of Contents

9. Troubleshooting........................................................20

9.1 Checking Sensor Operation............................................................... 20

9.2 Radiometer Produces No Apparent Output ....................................... 21

9.3 Readings Are Not As Expected ......................................................... 21

Figures

4-1. Siting and mounting diagram for the NR-LITE2................................. 2

4-2. Mounting the NR-LITE2 onto a pole (top) and crossarm (bottom)

via the 26120 Mounting Kit ............................................................. 4

5-1. Electrical circuit for the NR-LITE2 Net Radiometer .......................... 9

5-2. Cosine response of a typical net radiometer ...................................... 10

5-3. NR-LITE2 wind sensitivity ............................................................... 11

6-1. NR-LITE2’s components and dimensions (in millimeters)............... 12

7-1. NR-LITE2 to datalogger connections................................................ 13

Tables

7-1. Datalogger Connections for Differential Measurement..................... 13

7-2. Datalogger Connections for Single-Ended Measurement.................. 14

7-3. Wiring for CR3000 Example............................................................. 15

7-4. Wiring for CR1000 Example............................................................. 16

7-5. Wiring for CR10X Example (without Wind Correction) .................. 17

7-6. Wiring for CR10X Example (with Wind Correction) ....................... 18

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NR-LITE2 Net Radiometer

1. Introduction

The NR-LITE2 is a high-output thermopile sensor which 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.

Before using the NR-LITE2, please study:

• Section 2, Cautionary Statements

• Section 3, Initial Inspection

• Section 4, Quick Start

2. Cautionary Statements

• 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, consult with a
Campbell Scientific applications engineer.

• 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, to ensure that parts are included.

1

NR-LITE2 Net Radiometer

3.1 Ships With

4. Quickstart

4.1 Siting Considerations

(1) WRR traceable calibration certificate
(1) Mounting arm from original manufacturer
(1) Bird stick from original manufacturer
(1) ResourceDVD

Please review Section 7, Operation, for wiring, CRBasic programming, and
Edlog programming.

1. Mount the sensor so that no shadow 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 4-1).

2. To avoid shading effects and to promote spatial averaging, the NR-LITE2

should be mounted at least 1.5 m above the ground surface. It is
recommended that the NR-LITE2 be mounted to a separate vertical pipe at
least 25 ft from any other mounting structures (2 in FIGURE 4-1).

3. Orient the sensor towards the nearest pole to avoid potential problems

from shading (3 in FIGURE 4-1).

2

FIGURE 4-1. Siting and mounting diagram for the NR-LITE2

4.2 Mounting

NR-LITE2 Net Radiometer

The mounting bracket kit, pn 26120, is used to mount the NR-LITE2 directly
to a vertical pipe, or to a CM202, CM204, or CM206 crossarm. Mount the
sensor as follows:

1. Screw in the bird repellent stick, which is shipped with the calibration

documentation (4 in FIGURE 4-1).

2. Attach the 26120 mounting bracket to the vertical mounting pipe, or

CM200-series crossarm using the provided U-bolt (FIGURE 4-2).

3. Insert the sensor’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 (FIGURE 4-2).

4. Perform a coarse leveling of the sensor using the sensor’s bubble level (5

in FIGURE 4-1).

5. Tighten the four screws on top of the mounting bracket to properly secure

the support arm so that it does not rotate (FIGURE 4-2).

CAUTION

Do not attempt to rotate the instrument using the sensor
head or you may damage the sensor — use the support
arm only.

6. Perform the fine leveling using the two spring-loaded leveling screws—

one on the front and the other on the back of the bracket (FIGURE 4-2).

7. Route the sensor cable to the instrument enclosure.

8. Use cable ties to secure the cable to the vertical pipe or crossarm and

tripod/tower.

3