Products

LI-3000C Portable Area Meter
Non-Destructive Leaf Area Measurement in the Field or Laboratory
The LI-3000C combines an easy to use readout console with the proven scanning technology of the LI-3000C sensor head to provide a powerful system for portable, non-destructive leaf area measurements. It utilizes an electronic method of rectangular approximation to provide > 1 mm resolution. Leaf area, leaf length, average width, and maximum width are logged by the readout console as the scanning head is drawn over a leaf. Files can be viewed on the display or output to a computer using the new LI-3000C applications software.
Why the LI-3000C Portable Area Meter?

Simple, Fast and Accurate

Proven Technology

Non-destructive measurements

Can be used for detached leaves

Lightweight

NEW! Windows Interface Software

LI-3100C Area Meter

LI-3100C Portable Area Meter
The LI-3100C Area Meter is designed for efficient, exacting measurements of both large and small objects. User-selectable area resolution of either 1 mm² or 0.1 mm² is available without having to change optics. This versatility provides the flexibility necessary for diverse project requirements.

Area, Length, Maximum Width, Average Width
A single lens provides adjustable resolution of 0.1 or 1 mm²
High accuracy and repeatability, and fast, continuous operation for large quantities of samples with individual or cumulative area recorded
Large (25 cm wide, 2.5 cm thick with 1 mm² resolution) or small (<1 cm² area when using 0.1 mm² resolution) leaves or other objects, including needles
Quiet belt system with adjustable press roller to flatten curled leaves
Data are shown on the instrument LED display or on the computer screen using Windows® software to collect and store data via RS-232 or USB

Why the LI-3100C Area Meter?

Simple, Fast and Accurate
Proven Technology
Choice of resolutions
Windows^® Interface Software
Data stored directly to a computer

LAI-2000 Plant Canopy Analyser

LAI-2000 Plant Canopy Analyser
For Direct, Rapid, Non-Destructive LAI Measurements
Why Measure Leaf Area Index (LAI)?
Leaf Area Index (LAI) is the ratio of the foliage area to the ground area. The measurement of LAI is of fundamental importance in agricultural and ecological research because LAI is a measure of plant growth; it directly affects the interception and absorption of light by the canopy and it influences the heat balance and evaporation from the landscape.

Why should you consider the LAI-2000 to measure Leaf Area Index?

The LAI-2000 is the premier LAI instrument in the world.
Saves time and labor
Provides on-site evaluation of LAI data
Can be used for short or tall canopies (i.e. grass to forest)
Used for broad canopies (i.e. forest), small isolated canopies (i.e. individual trees) or row crop canopies
Calculates foliage inclination angle and other relevant parameters
Can be used under a variety of sky conditions, including sunny conditions
Either of three modes of operation can be chosen, depending on the canopy

The LAI-2000 calculates Leaf Area Index (LAI) and other canopy structure attributes from radiation measurements made with a “fish-eye” optical sensor (148° field-of-view). Measurements made above and below the canopy are used to determine canopy light interception at 5 angles, from which LAI is computed using a model of radiative transfer in vegetative canopies.

Product Category : Gas Analyser ‎(5)

LI-8100

LI-8100 Automated Soil CO2 Flux System
Introduced in 2003, the LI-8100 Automated Soil CO2 Flux System provides researchers sophisticated flux monitoring instrumentation in a dedicated system that is integrated and easy to use. The LI-8100 System provides unparalleled versatility with two short-term survey and two long-term chambers available, in addition to the ability to multiplex up to 16 long-term chambers. Modular by design, the LI-8100 System's flexibility allows researchers to build custom systems from a selection of available components.

LI-8100

LI-7500 Open Path CO2/H2O Gas Analyzer

LI-7500 Open Path CO2/H2O Gas Analyzer
A Novel Design In an Analyzer for Eddy Covariance Studies
The smooth, simple, aerodynamic profile of the LI-7500 Open Path CO2/H2O Gas Analyzer belies the innovations within - optics, electronics, and software - that allow fast, precise measurements of in situ densities of CO2 and H2O in turbulent air structures. In eddy covariance studies, these data are used in conjunction with sonic anemometer turbulence data to determine the fluxes of CO2 and H2O. Applications include determining the carbon dioxide and water vapor budgets of agricultural or natural landscapes such as forest canopies, grasslands, deserts, oceans, etc. for global change and ecological studies.
budgets of agricultural or natural landscapes such as forest canopies, grasslands, deserts, oceans, etc. for global change and ecological studies.

LI-7000: The Next Generation CO2/H2O Gas Analyzer

The LI-7000 CO₂/ H₂O Gas Analyzer is a high performance, dual cell, differential gas analyzer. It uses a dichroic beam splitter and two separate detectors to measure infrared absorption by CO₂ and H₂O in the same gas stream. At the heart of the LI-7000 is an innovative optical bench that can be dismantled and cleaned by the user without the need for factory recalibration.

LI-820 CO2 Gas Analyzer

LI-820 CO2 Gas Analyzer
Ideal For Continuous CO2 Monitoring Applications
The LI-820 CO2 Analyzer is a low cost, low maintenance CO2 analyzer designed for continuous monitoring applications. It is an absolute, non-dispersive infrared (NDIR) gas analyzer based upon a single path, dual wavelength, infrared detection system. It can be used in a wide range of environmental conditions.
The interchangeable optical benches can be easily cleaned by the user; simply remove the source and detector headers and swab out the optical path (a cleaning kit is included with the LI-820). This reduces down-time due to contamination, and eliminates the need for factory recalibration.

LI-840 CO2/H2O Gas Analyzer

LI-840 CO2/H2O Gas Analyzer
For Continuous Monitoring of CO2 and H2O
Specifically designed for continuous monitoring of CO2 and H2O over a wide range of environmental conditions, the LI-840 is an absolute, non-dispersive, infrared (NDIR) gas analyzer based on a single, interchangeable optical path, and a dual wavelength infrared detection system.
Why the LI-840?
The only gas analyzer in the world that can measure CO2 and H2O simultaneously using NDIR technology at this price range
High accuracy due to automatic temperature and pressure compensation
High stability with low zero and span drift
CO2 corrected for band broadening due to presence of water vapor
Sensitivity to water vapor is < 0.1 ppm CO2/ppt H2O
Optical path that can be easily cleaned by the user (cleaning kit included with the LI-840) without requiring factory recalibration
An optical bench provides CO2 measurement range of 0-3000 ppm and an H2O measurement range of 0-80 ppt
< 1 ppm signal noise at 370 ppm for CO2 and < 0.01 ppt at 10 ppt for H2O
Wide operating temperature range of -20 to +45 °C
Compact, lightweight design with low power consumption
Maximum flow rate of 1 liter/minute

Product Category : Light Meter ‎(5)

LI-200 Pyranometer Sensor

LI-200 Pyranometer Sensor

The LI-200 Pyranometer is designed for field measurement of global solar radiation in agricultural, meteorological, and solar energy studies. In clear, unobstructed daylight conditions, the LI-COR pyranometer compares favorably with first class thermopile-type pyranometers (1, 4), but is priced at a fraction of the cost.
Patterned after the work of Kerr, Thurtell and Tanner (2), the LI-200 features a silicon photovoltaic detector mounted in a fully cosine-corrected miniature head. Current output, which is directly proportional to solar radiation, is calibrated against an Eppley Precision Spectral Pyranometer (PSP) under natural daylight conditions in units of watts per square meter (W m^-2). Under most conditions of natural daylight, the error is < 5% (2).

LI-190 Quantum Sensor

LI-190 Quantum Sensor

During photosynthesis, plants use energy in the region of the electromagnetic spectrum from 400-700 nm. The radiation in this range, referred to as Photosynthetically Active Radiation (PAR), can be measured in energy units (watts m^-2) or as Photosynthetic Photon Flux Density (PPFD), which has units of quanta (photons) per unit time per unit surface area. The units most commonly used are micromoles of quanta per second per square meter (mmol s-1 m^-2). Plant scientists, horticulturists, ecologists, and other environmental scientists use the LI-190 Quantum Sensor to accurately measure this variable.
Accurate measurements are obtained under all natural and artificial lighting conditions because of the computer-tailored spectral response of the LI-190. Colored glass filters are used to tailor the silicon photodiode response to the desired quantum response. An interference filter provides a sharp cutoff at 700 nm, which is critical for measurements under vegetation where the ratio of infrared to visible light may be high. A small response in the infrared region can cause an appreciable measurement error. This sensor, developed from earlier work (1), was pioneered by LI-COR and has become the standard for PPFD measurement in most photosynthesis-related studies.
The LI-190 is also used in oceanography, limnology, and marine science as a reference sensor for comparison to underwater PAR measured by the LI-192 Underwater Quantum Sensor and LI-193 Spherical Underwater Quantum Sensor.

LI-210 Photometric Sensor

LI-210 Photometric Sensor

Measures Illuminance as Related to the CIE Standard Observer Curve

The LI-210 Photometric Sensor utilizes a filtered silicon photodiode to provide a spectral response that matches the CIE curve within ± 5% with most light sources. This photodiode and filter combination is placed within a fully cosine-corrected sensor head to provide the proper response to radiation at various angles of incidence.
Some of the applications for the LI-210 Photometric Sensor include interior and industrial lighting, outdoor illuminance, passive solar energy, architecture and lighting models, illumination engineering, and biological sciences that require illuminance measurements. The LI-210 is a research grade photometric sensor that is very reasonably priced.
Photometry refers to the measurement of visible radiation (light) with a sensor having a spectral responsivity curve equal to the average human eye. This curve is known as the CIE Standard Observer Curve (photopic curve). Photometric sensors are used to measure lighting conditions where the eye is the primary receiver, such as illumination of work areas, interior lighting, television screens, etc. Although photometric measurements have been used in the past in plant science, PPFD and irradiance are the preferred measurements.

LI-192 Underwater Quantum Sensor

LI-192 Underwater Quantum Sensor

Underwater or atmospheric Photosynthetic Photon Flux Density (PPFD) can be accurately measured using the LI-192 Underwater Quantum Sensor. The LI-192 is cosine corrected and features corrosion resistant, rugged construction for use in freshwater or saltwater and pressures up to 800 psi (5500 kPa, 560 meters depth).
Underwater PAR Measurement
Accurate measurement of Photosynthetically Active Radiation (PAR, 400-700 nm) in aquatic environments is accomplished using either the LI-192 Underwater Quantum Sensor or the LI-193 Spherical Quantim Sensor.
Limnologists, oceanographers and biologists conducting aquatic productivity studies and vertical profiling have used these sensors extensively.
For extremely turbid conditions, radiation levels with resolution to 0.01 µmol s^-1 m^-2 can be measured with the LI-192 or LI-193 Spherical Quantim Sensor.
the The LI-193 use computer-tailored filter glass to achieve the desired quantum response. Calibration is traceable to NIST

LI-193 Spherical Quantum Sensor

LI-193 Spherical Quantum Sensor

Underwater PAR From All Directions

The LI-193 Underwater Spherical Quantum Sensor gives an added dimension to underwater PAR measurements as it measures photon flux from all directions. This measurement is referred to as Photosynthetic Photon Flux Fluence Rate (PPFFR) or Quantum Scalar Irradiance. This is important, for example, when studying phytoplankton, which utilize radiation from all directions for photosynthesis.
The LI-193 features a high sensitivity optical design and compact, rugged construction (3400 kPa, 350 meters depth, 3400 kPa = 493 psi).
The graph at right indicates the typical angular response of the LI-193 Spherical Quantum Sensor. The low response on the bottom of the sensor is due to light blockage by the detector housing. The error due to this low response is not significant in most cases because of the small portion of upwelling radiation compared to the total radiation.

Product Category : Photosynthesis ‎(1)

LI-6400XT Portable Photosynthesis System

LI-6400 XT Portable Photosynthesis System
Photosynthesis
The LI-6400 was the first photosynthesis measurement system to put the CO2 and H2O gas analyzers in the sensor head. These dual path, non-dispersive infrared analyzers feature an open path design with the optical bench of the sample analyzer open directly to the leaf chamber mixing volume. Leaf dynamics are measured in real time, preventing confounding correlations between gas exchange and changes in environmental driving variables.
Fluorescence
The field-installable Leaf Chamber Fluorometer easily attaches to the LI-6400XT sensor head. This integrated system gives the user complete control of the leaf environment for simultaneous collection of gas exchange and chlorophyll fluorescence data from a single, portable unit.
Soil Respiration
Attach the Soil CO2 Flux Chamber to the LI-6400XT System for an additional carbon cycle application. A pre-defined software protocol and automated measurement cycling ensure ease of use and accurate data collection.