The Standard in

Plant Stress Measurement



Highly Portable Ambient Photosynthesis System that is easy to use and measures CO2 to +/- 1 μmol

The LCi-SD is our smallest, lightest and most user-friendly portable photosynthesis measurement system ever. It allows access to field sites previously considered unsuitable for conventional gas exchange systems.


  • Very Easy to use - automated IRGA zero calibration and other automated housekeeping functions allows reliable use with minimal training
  • Ultra compact - weighs only 2kg or 5lbs.
  • Measures CO2 to  +/-1 μmol or +/- 1 ppm
  • Measures H2O to +/- 1 mmol  or 1000 ppm
  • IRGA near the measuring chamber
  • Also measures:
    • Leaf temperature
    • Chamber temperature
    • Barometric pressure
    • Q (PAR or light level)
  • USB and removable SD data card data output
  • The LCi-SD is a portable ambient photosynthesis measuring system. This system is very easy to use yet repeatable, accurate and reliable. CO2 is measured to 1 ppm or 1 μmole, and H2O is measured to 0.1 mbars or 1 mmole. The range for CO2 measurement is 0-2000 μmoles, and the range for H2O measurement is 0-75.5 mmoles. The system has an auto-zero calibration that occurs after every photosynthesis measurement. Measured values are corrected for atmospheric pressure and IRGA drift. Various special measuring chambers are available for Arabidopsis, conifers, narrow leaves, and soil respiration. Flow rate is adjustable, PAR is measured, leaf temperature is measured, and battery charge life is at least 8 hours.

  • Measurement range and technique:



    0-2000 ppm, 1 ppm resolution

    Infrared gas analysis, differential open system, auto zero, automatic atmospheric pressure and temperature compensation.


    0-75 mbar, 0.1 mbar resolution

    Two laser trimmed, fast response water vapor sensors.


    0-3000 μmols/m2-sec.

    Silicon photocell.

    Chamber temperature:

    -5 to 50 degrees C.

    Precision thermistor

    +/- 0.2 degrees C accuracy.

    Direct leaf temperature:

    -5 to 50 degrees C

    Self positioning microchip thermistor / Energy balance / manually positioned thermistor.

    Flow rate to leaf chamber:

    100 to 500 ml /min.

    Gas connections:

    3 mm barbed.

    Warm up time:

    5 minutes at 20 degrees C.


    240 x 64 dot matrix super twist graphic LCD.

    Recorded data:

    Removable SD cards typically store 16 million sets of data on a 1Gb card.


    2.8Ah 12V lead acid battery

    Up to 10 hours life between charges.

    Battery charger:

    Universal input voltage, Intelligent control.

    Data output:


    SD Data card:

    1-2 Gigabyte

    USB connection:


    Functions as mass storage device.

    RS232 output:

    9 Pin "D" type.

    User-selectable rates of up to 230,400 baud for computer or printer connection.



    Operating temperature range:

    5 to 45 degrees C.

    Dimensions H x W x D:

    Console: 240 x 125 x 140 mm.

    Plant leaf chamber: 300 x 80 x 75 mm.


    Console: 2.4kg.

    Plant leaf chamber: 0.6kg.

  • PDF document.

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Opti-Sciences, Inc.     8 Winn Avenue      Hudson NH 03051       USA      (603)883-4400


Opti-Sciences, Inc.

8 Winn Ave

Hudson, NH 03051, USA

Phone: (603) 883-4400

Fax: (603) 883-4410