The Standard in

Plant Stress Measurement



Highly Portable Ambient Photosynthesis System (IRGA) with touch screen control.


Measures all types of plant stress at an affordable price.

The LCi-T 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, with minimal training.


  • Very Easy to use - automated IRGA zero calibration and other automated housekeeping functions allows reliable use with minimal training
  • Ultra compact - weighs only 2kg (5lbs).
  • Measures CO2 to  +/-1 μmol or +/- 1 ppm
  • Measures H2O to +/- 1 mmol  or 1000 ppm
  • IRGA near the measuring chamber
  • USB and removable 32 GB SD data card data output


Also measures:

  • Leaf temperature
  • Chamber temperature
  • Barometric pressure
  • Q (PAR or light level)
  • The LCi-T is a highly portable ambient photosynthesis measuring system (IRGA). 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 mmol. The range for CO2 measurement is 0-2000 μmoles or ppm, and the range for H2O measurement is 0-75.5 mmols or mbars. The system has an auto-zero calibration that occurs after every photosynthesis measurement. The instrument reports "A" or photosynthetic rate, "E" or transpiration and "Gs" or stomatal conductance. Measured values are corrected for atmospheric pressure and IRGA drift with every measurement.

    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 (IRGA), differential open system, auto IRGA zero, automatic atmospheric pressure and temperature compensation.


    0-75 mbar, 0.1 mbar resolution.

    Two laser trimmed, fast response water vapor sensors.

    Measuring Time:

    About 16 Seconds.

    Warm up time:

    5 minutes at 20 oC.

    PAR control by LED Light Source:

    0-2,400 μmols/m2-sec by RGB LED light source or 0-2,500 μmols/m2-sec white LED light source.

    These light sources allow variable spectral variation capability.

    PAR measurement:

    0-3000 μmols/m2-sec.

    Silicon photocell.

    Chamber temperature:

    -5 to 50 oC.

    Precision thermistor

    +/- 0.2 oC accuracy.

    Direct leaf temperature:

    -5 to 50 oC, +/- 0.2 oC

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

    Flow rate to leaf chamber:

    68 to 340 μmols/m2-sec.

    Gas connections:

    3 mm barbed.


    Color 420 X 240 LCD with touch screen.

    Recorded data:

    Stored on removable SD cards.


    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:

    Up to 32 Gigabyte supported.

    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 oC.

    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