Indian Council of Agricultural Research
(Agricultural Knowledge Management Information System)

ICAR-Central Plantation Crops Research Institute, Kudlu P.O., Kasaragod-671124, Kerala (
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Instrument Details
Instrument/Facility Name: Portable Photosynthesis System
Make                                   : LICOR
Model                                  : LI6400XT
Specification   :CO2 Analyzer Range: 0-3100 μmol mol-1,H2O Analyzer Range: 0-75 mmol mol-1,Light Measurement Range: 0 to > 3000 μmol m-2 s-1

Click to View1. CO2 Analyzer Range: 0-3100 μmol mol-1; Accuracy:Maximum deviation: ± 5 μmol mol-1 from 0 to1500 μmol mol-1 ± 10 μmol mol-1 from 1500 to 3100 μmol mol-1; Sensor: Solid state. 2. H2O Analyzer Range: 0-75 mmol mol-1, or 40 °C dew point; Accuracy: Maximum deviation: ± 1.0 mmol mol-1 from 0-75 mmol mol-1. 3. Temperature Sensor Type: 3-wire thermistor; Range: -10 to 50 °C; Accuracy: Maximum error < ± 0.5 °C; Leaf Temperature; Thermocouple:Type: E;Range: ± 50 °C of reference;Reference: Optical housing block thermistor. 4. Air Flow Flow rate: 0 to 700 μmol s-1 5. Pressure Pressure Range: 65 to 115 kPa absolute 6. System Console Processor: 400 MHz Intel XScale; Power Requirement: 10.5 to 15 VDC 4A 7. Light Measurement Range: 0 to > 3000 μmol m-2 s-1.; Resolution: < 1 μmol m-2 s-1 .;Calibration Accuracy: ± 5% of reading, traceable to NIST.

  Working Principles
Click to ViewThe LI-6400XT is an open system, which means that measurements of photosynthesis and transpiration are based on the differences in CO2 and H2O in an air stream that is flowing through the leaf cuvette. The LI-6400 improves upon traditional open systems by having the gas analyzers in the sensor head. This eliminates plumbing-related time delays, and allows tight control for responding to leaf changes. For example, if stomata close, the control system immediately detects the drop in water vapor and can compensate. Similarly, a sudden change in light level will cause an immediate change in photosynthetic rate, which will be detected as a change in the CO2 concentration. The speed of detection is not a function of the system’s flow rate, as in traditional systems, since the sample IRGA is in the cuvette. There is a second advantage of having the IRGAs in the sensor head. The traditional system has the potential for concentration changes (because of water sorption and CO2 diffusion) as the air moves from the reference IRGA to the chamber, and again from the chamber back to the sample IRGA. This is not a problem for the LI-6400, because the IRGA measurements are made after the air has travelled through the tubing.

  User Instructions
Portable System to measure PR, Stomatal Conductance.Follow the user manual instructions.

  Contact Us
Contact No. 04994232090
Email Id

  Portable Photosynthesis System Charges
Procedure Name
National LAB/R&D
Photosynthesis Measurements
Prior confirmation may be obtained from the Institute before taking DD / sending samples.

Additional Rs 100/-towards postal charges if result are to be posted
The Demand Draft should be in favour of "ICAR-Unit-CPCRI Kasaragod"
Letter, DD & Samples send to "The Director, ICAR-CPCRI, Kudlu P.O Kasaragod - 671 124. Kerala"