Campbell Scientific LI200X-L User Manual
LI200X Pyranometer
Revision: 6/10
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Copyright © 1994-2010
Campbell Scientific, Inc.
Warranty and Assistance
The LI200X PYRANOMETER is warranted by Campbell Scientific, Inc. to
be free from defects in materials and workmanship under normal use and
service for twelve (12) months from date of shipment unless specified
otherwise. Batteries have no warranty. Campbell Scientific, Inc.'s obligation
under this warranty is limited to repairing or replacing (at Campbell Scientific,
Inc.'s option) defective products. The customer shall assume all costs of
removing, reinstalling, and shipping defective products to Campbell Scientific,
Inc. Campbell Scientific, Inc. will return such products by surface carrier
prepaid. This warranty shall not apply to any Campbell Scientific, Inc.
products which have been subjected to modification, misuse, neglect, accidents
of nature, or shipping damage. This warranty is in lieu of all other warranties,
expressed or implied, including warranties of merchantability or fitness for a
particular purpose. Campbell Scientific, Inc. is not liable for special, indirect,
incidental, or consequential damages.
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) 753-2342. 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 “Declaration of Hazardous Material
and Decontamination” form and comply with the requirements specified in it.
The form is available from our website at
completed form must be either emailed to repair@campbellsci.com
435-750-9579. Campbell Scientific will not 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.
www.campbellsci.com/repair
. A
or faxed to
LI200X Table of Contents
PDF viewers note: These page numbers refer to the printed version of this document. Use
the Adobe Acrobat® bookmarks tab for links to specific sections.
1. General Description.....................................................1
1.1 Specifications............................................................................................1
2. Installation....................................................................2
3. Wiring............................................................................4
4. Programming ...............................................................5
4.1 Example Programs....................................................................................6
4.1.1 CR1000 Example Program .............................................................6
4.1.2 CR10X Example Program ..............................................................7
4.2 Total Solar Radiation................................................................................9
5. Maintenance .................................................................9
6. Calibration ..................................................................10
7. Troubleshooting ........................................................10
Appendix
A. LI200S Pyranometer................................................ A-1
A.1 LI200S Pyranometer........................................................................... A-1
A.1.1 Wiring ....................................................................................... A-1
A.2 Unmodified Pyranometers .................................................................. A-1
A.2.1 Wiring ....................................................................................... A-1
A.3 Input Range......................................................................................... A-2
A.4 Multiplier ............................................................................................ A-2
Figures
1-1. LI200X Pyranometer...............................................................................2
2-1. CM225 Pyranometer Mounting Stand and CM202 Crossarm ................3
2-2. 015ARM Pyranometer Mounting Arm ...................................................3
2-3. 025 Crossarm Stand and 019ALU Crossarm ..........................................4
3-1. LI200X Schematic...................................................................................5
A.2-1. Unmodified Pyranometer Wiring Schematic.................................. A-1
i
LI200X Table of Contents
Tables
3-1. Connections to Campbell Scientific Dataloggers ................................... 4
4-1. Multipliers Required for Average Flux and Total Flux Density
in Sl and English Units .................................................................... 6
4-2. Wiring for Example Programs................................................................ 6
A.4-1. Multipliers Required for Average Flux and Total Flux
Density for SI and English Units for a LI200S Pyranometer ...... A-2
ii
LI200X Pyranometer
1. General Description
The LI200X measures incoming solar radiation with a silicon photovoltaic
detector mounted in cosine-corrected head. The detector outputs current; a
shunt resistor in the sensor cable converts the signal from current to voltage,
allowing the LI200X to be measured directly by Campbell Scientific
dataloggers. The LI200X is calibrated against an Eppley Precision Spectral
Pyranometer to accurately measure sun plus sky radiation. Do not use the
LI200X under vegetation or artificial lights, because it is calibrated for the
daylight spectrum (400 to 1100 nm).
During the night the LI200X may read slightly negative incoming solar
radiation. This negative signal is caused by RF noise. Negative values may be
set to zero in the datalogger program.
For more theoretical information on the silicon photovoltaic detector see Kerr,
J. P., G. W. Thurtell, and C. B. Tanner: An integrating pyranometer for
climatological observer stations and mesoscale networks. J. Appl. Meteor., 6,
688-694.
1.1 Specifications
Stability: < ±2% change over a 1 year period
Response Time: 10 µs
Cosine Correction: Cosine corrected up to 80°
Operating
Temperature: -40 to +65 °C
Temperature
Dependence: 0.15% per °C
Relative Humidity: 0 to 100%
Detector: High stability silicon photovoltaic detector (blue
enhanced)
Sensor Housing: Weatherproof anodized aluminum case with acrylic
diffuser and stainless steel hardware
Size: 0.94" dia x 1.00" H (2.38 cm dia x 2.54 cm H)
Weight: 1 oz. (28 g)
Accuracy: Absolute error in natural daylight is ±5% maximum;
±3% typical
Sensitivity: 0.2 kW m
Linearity: Maximum deviation of 1% up to 3000 W m
Shunt Resistor: Adjustable, 40.2 to 90.2 Ω, factory set to give the above
sensitivity
-2
mV-1
-2
Light Spectrum
Waveband: 400 to 1100 nm
1
LI200X Pyranometer
NOTE
The black outer jacket of the cable is Santoprene
®
rubber. This
compound was chosen for its resistance to temperature extremes,
moisture, and UV degradation. However, this jacket will
support combustion in air. It is rated as slow burning when
tested according to U.L. 94 H.B. and will pass FMVSS302.
Local fire codes may preclude its use inside buildings.
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2. Installation
FIGURE 1-1. LI200X Pyranometer
The LI200X should be mounted such that it is never shaded by the
tripod/tower or other instrumentation. The sensor should be mounted with the
cable pointed towards the nearest magnetic pole, e.g. in the Northern
Hemisphere point the cable towards the North Pole.
Mounting height is not critical for the accuracy of the measurement. However,
pyranometers mounted at heights of 3 m or less are easier to level and clean.
To ensure accurate measurements, the LI200X should be mounted using
LI2003S base/leveling fixture. This base incorporates a bubble level and three
adjustment screws. The LI200X and base/leveling fixture are attached to a
tripod or tower using one of three mounting configurations (see Figure 2-1
through 2-3).
Tools required for installation on a tripod or tower:
Small and medium Phillips screwdrivers
5/32” Allen wrench for NU-RAIL (Figure 2-3)
1/2” open end wrench for 015ARM or CM225 (Figures 2-1, 2-2)
Tape measure
UV-resistant wire ties
Side-cut pliers
Compass
Step ladder
2
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