Campbell Scientific LI190SB User Manual
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LI190SB Quantum Sensor
Revision: 3/08
Copyright © 1982-2008
Campbell Scientific, Inc.
Warranty and Assistance
The LI190SB QUANTUM SENSOR 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
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
LI190SB 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
2. Specifications ..............................................................2
3. Installation....................................................................3
4. Wiring............................................................................4
5. Programming ...............................................................5
5.1 Input Range...............................................................................................7
5.2 Example Programs....................................................................................8
5.2.1 CR1000 Example Program.............................................................8
5.2.2 CR10X Example Program ..............................................................9
5.3 Output Format Considerations................................................................10
6. Maintenance and Calibration....................................11
7. Troubleshooting ........................................................11
8. Acknowledgements...................................................11
Figures
1-1. LI190SB Spectral Response....................................................................1
2-1. LI190SB Quantum Sensor.......................................................................2
3-1. CM225 Pyranometer Mounting Stand and CM202 Crossarm................ 3
3-2. 015 Pyranometer Mounting Arm.............................................................4
3-3. 025 Crossarm Stand and 019ALU Crossarm..........................................4
4-1. LI190SB Schematic.................................................................................5
5-1. Differential Measurement Connection.................................................... 6
5-2. Single-ended Measurement Connection..................................................6
Tables
4-1. Connections to Campbell Scientific Dataloggers....................................5
5-1. Multiplier Required for Flux Density and Total Fluxes..........................7
5-2. Wiring for Example Programs ................................................................8
i
LI190SB Quantum Sensor
1. General Description
The LI190SB quantum sensor measures photosynthetically active radiation
(PAR) in the 400 to 700 nm waveband. The unit of measurement is µmoles
per second per square meter (µmol s
The quantum sensor is designed to measure PAR received on a plane surface.
The indicated sensor response (Figure 1-1) is selected because it approximates
the photosynthetic response of plants for which data are available. A silicon
photodiode with an enhanced response in the visible wavelengths is used as the
sensor. A visible bandpass interference filter in combination with colored
glass filters is mounted in a cosine corrected head.
Measuring PAR within plant canopies, greenhouses, controlled environment
chambers, confined laboratory conditions, or at remote environmental
monitoring sites are all typical applications for this sensor.
During the night the LI190SB may output a slightly negative value, caused by
RF noise. Negative values may be set to zero in the datalogger program.
A Calibration Certificate is shipped with each sensor that includes a serial
number and calibration constant. The calibration constant is unique for each
sensor, and is used to compute the multiplier for the measurement instruction
in the datalogger program.
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FIGURE 1-1. LI190SB Spectral Response
1
LI190SB Quantum Sensor
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2. Specifications
Stability: <±2% change over a 1 year period
Response Time: 10 μs
Temperature
Dependence: 0.15% per °C maximum
Cosine Correction: Cosine corrected up to 80° angle of incidence
Operating
Temperature: -40 to 65°C
Relative Humidity: 0 to 100%
Detector: High stability silicon photovoltaic detector (blue
Sensor Housing: Weatherproof anodized aluminum case with acrylic
Size: 0.94” dia x 1.00” H (2.38 x 2.54 cm);
Weight: 1 oz. (28 g)
enhanced)
diffuser and stainless steel hardware
NOTE
Calibration: ±5% traceable to the U.S. National Institute of
Standards Technology (NIST)
Sensitivity: Typically 5 μA per 1000 μmoles s
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Linearity: Maximum deviation of 1% up to 10,000 μmoles s
Shunt Resistor: 604 ohms
Light Spectrum
Waveband: 400 to 700 nm
®
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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FIGURE 2-1. LI190SB Quantum Sensor
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