Campbell Scientific CMP6-L, CMP11-L, CMP21-L User Manual
CMP6 -L, CMP11-L, and
CMP21-L Pyranometers
Revision: 9/13
Copyright © 2006-2013
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 (435) 227-9000. 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 repair@campbellsci.com or faxed to
(435) 227-9106. 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
3.2 Calibration Certificate..........................................................................2
4. Quick Start................................................................... 2
4.1 Siting ....................................................................................................2
4.2 Mounting..............................................................................................3
4.3 Datalogger Programming / Wiring.......................................................5
5. Overview......................................................................6
5.1 Models..................................................................................................6
5.2 Construction.........................................................................................6
6. Specifications .............................................................7
6.1 Pyranometers........................................................................................7
6.2 CVF3 Ventilation Unit.........................................................................8
7. Installation...................................................................9
7.1 Mounting to a Tripod or Tower............................................................9
7.2 Wiring ................................................................................................11
7.2.1 CMP6, CMP11, and CMP21 Thermopile Schematic..................12
7.2.2 CMP6 and CMP11 Wiring..........................................................12
7.2.3 CMP21 Wiring............................................................................13
7.3 Programming......................................................................................14
7.3.1 Solar Radiation Measurements ...................................................14
7.3.1.1 Input Range ......................................................................15
7.3.1.2 Multiplier..........................................................................15
7.3.1.3 Offset................................................................................16
7.3.1.4 Output Format Considerations .........................................16
7.3.2 CMP21 Internal Thermistor Measurement .................................16
7.3.3 Example Programs......................................................................17
7.3.3.1 CR1000 Example Program for Measuring a CMP6.........17
7.3.3.2 CR1000 Example Program for Measuring a CMP11.......18
7.3.3.3 CR1000 Example Program for Measuring a CMP21.......19
7.3.3.4 CR10X Example Program for Measuring a CMP6..........20
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Table of Contents
8. Maintenance ..............................................................22
8.1 Cleaning Domes ................................................................................ 23
8.2 Changing the Desiccant..................................................................... 23
8.3 Check Sensor Output......................................................................... 24
8.4 Recalibration ..................................................................................... 24
9. Troubleshooting........................................................25
Appendix
A.
CVF3 Heater/Ventilator ...........................................A-1
A.1 General Information ........................................................................ A-1
A.2 Siting ............................................................................................... A-1
A.3 CVF3 Installation ............................................................................ A-2
A.4 Wiring.............................................................................................. A-4
A.5 CVF3 Heater/Ventilator Maintenance............................................. A-5
Figures
Tables
4-1. Pyranometer installation...................................................................... 3
4-2. Pyranometer mounted horizontally for the Northern Hemisphere
(left) and Southern Hemisphere (right)............................................ 3
4-3. Two views of a pyranometer mounted at an angle for the Northern
Hemisphere...................................................................................... 4
4-4. Pyranometer mounted at an angle for the Southern Hemisphere......... 4
4-5. SCWin Short Cut Program Generator ................................................. 5
6-1. Dimensions of the CMP6, CMP11, and CMP21................................. 8
6-2. Dimensions of the CVF3..................................................................... 8
7-1. CM245 bracket with 2.125” u-bolts positioned to mount the
pyranometer horizontally on a crossarm.......................................... 9
7-2. CM245 bracket with 1.5” u-bolts positioned to mount pyranometer
at a 40° angle on a vertical pipe..................................................... 10
7-3. Exploded view of the pyranometer mounting.................................... 11
7-4. CMP6, CMP11, and CMP21 thermopile detector schematic ............ 12
8-1. Reading is reduced if dome is not dry or clean.................................. 23
8-2. Changing the desiccant...................................................................... 24
A-1. Transparent view of CVF3 shows air flow...................................... A-1
A-2. Pyranometer mounted to the CVF3 ................................................. A-2
A-3. CVF3 installed onsite ...................................................................... A-3
A-4. Fastening cover on CVF3................................................................ A-4
A-5. CVF3 filter replacement.................................................................. A-5
6-1. CMP-series Specifications................................................................... 7
7-1. CMP6 and CMP11 Differential Connections to Campbell
Scientific Dataloggers.................................................................... 12
7-2. CMP6 and CMP11 Single-Ended Connections to Campbell
Scientific Dataloggers.................................................................... 13
7-3. CMP21 Differential Connections to Campbell Scientific
Dataloggers .................................................................................... 13
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Table of Contents
7-4. CMP21 Single-Ended Connections to Campbell Scientific
Dataloggers.....................................................................................14
7-5. Multipliers Required for Flux Density and Total Fluxes ...................15
7-6. CR1000 Wiring for CMP6 Example Program ...................................17
7-7. CR1000 Wiring for CMP11 Example Program .................................18
7-8. CR1000 Wiring for CMP21 Example Program .................................19
7-9. CR10X Wiring for CMP6 Example Program ....................................21
A-1. CVF3 Wiring................................................................................... A-4
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Table of Contents
iv
CMP6-L, CMP11-L, and CMP21-L
Pyranometers
1. Introduction
CMP-series pyranometers are designed for continuous outdoor monitoring of
solar radiation intensity. A flat spectral sensitivity from 285 to 2800 nm
enables accurate measurements in natural sunlight, under plant canopies, and in
green houses or buildings. When inverted, these pyranometers can measure
reflected solar radiation. Uses include monitoring global horizontal irradiance
(GHI) and plane of array irradiance (POA). Diffuse sky radiation can also be
measured with the use of a shade mechanism.
CMP-series pyranometers are manufactured by Kipp & Zonen, and cabled by
Campbell Scientific.
Before using these pyranometers, please study:
• Section 2, Cautionary Statements
• Section 3, Initial Inspection
• Section 4, Quick Start
More details are available in the remaining sections.
2. Cautionary Statements
• CMP-series pyranometers are rugged, but they should be handled as
precision 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, consult with a
Campbell Scientific applications engineer.
3. Initial Inspection
Check the contents of the shipment. If there is a shortage (see Section 3.1,
Ships With), contact Campbell Scientific. If any damage has occurred during
transport, immediately file a claim with the carrier and contact Campbell
Scientific to facilitate repair or replacement.
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.
1
CMP6-L, CMP11-L, and CMP21-L Pyranometers
3.1 Ships With
(2) Bolts for mounting from original mfg
(1) Instruction Manual from original mfg
(1) Sun Shield from original mfg
(2) Nylon washers from original mfg
3.2 Calibration Certificate
Each pyranometer is shipped with an instruction manual provided by Kipp &
Zonen that contains information concerning its construction, spectral
sensitivity, cosine response, and a simple sensor check out procedure. Included
with the sensor and manual is a calibration certificate with the sensor
sensitivity value and serial number.
NOTE
4. Quick Start
NOTE
4.1 Siting
Cross check this serial number against the serial number on your
pyranometer to ensure that the given sensitivity value
corresponds to your sensor.
Appendix A, CVF3 Heater/Ventilator, provides the installation
procedure for the CVF3 ventilation unit.
The pyranometer is usually installed horizontally for global horizontal
measurements. However, the pyranometer can be installed at any angle for
POA measurements and in the inverted position for reflected measurements. In
all cases it will measure the solar flux incident on the sensor surface.
Site the pyranometer to allow easy access for maintenance while ideally
avoiding any obstructions above the plane of the sensing element. It is
important to mount the pyranometer such that a shadow 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 and latest sunset has an elevation not
exceeding 5°. Diffuse solar radiation is less influenced by obstructions near
the horizon. For instance, an obstruction with an elevation of 5° over the
whole azimuth range of 360° decreases the downward diffuse solar radiation
by only 0.8%.
2
The sensor should be mounted with the cable pointing towards the nearest
magnetic pole (e.g., in the Northern Hemisphere point the cable toward the
North Pole); see FIGURE 4-1 through FIGURE 4-4.
4.2 Mounting
CMP6-L, CMP11-L, and CMP21-L Pyranometers
See Section 7.1, Mounting to a Tripod Tower, for more information.
CM245 Adjustable
Angle Mounting
Stand
CM2XX-Series
Crossarm
FIGURE 4-1. Pyranometer installation
FIGURE 4-2. Pyranometer mounted horizontally for the Northern
Hemisphere (left) and Southern Hemisphere (right)
3
CMP6-L, CMP11-L, and CMP21-L Pyranometers
FIGURE 4-3. Two views of a pyranometer mounted at an angle for the
Northern Hemisphere
4
FIGURE 4-4. Pyranometer mounted at an angle for the Southern
Hemisphere
CMP6-L, CMP11-L, and CMP21-L Pyranometers
4.3 Datalogger Programming / Wiring
The simplest method for programming the datalogger to measure a CMP6 or
CMP11 is to use Campbell Scientific's SCWin Short Cut Program Generator
(see FIGURE 4-5). Wire the pyranometer according to the wiring diagram
generated by Short Cut.
NOTE
The CMP21 is not included in Short Cut. Refer to Section 7,
Installation, for wiring and programming information if not
using Short Cut.
FIGURE 4-5. SCWin Short Cut Program Generator
5
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