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Enabling better global research outcomes in soil, plant & environmental monitoring.

CI-340 Photosynthesis System

The CI-340 Handheld Photosynthesis System features a new design concept and compact solid-state structure.

The entire system: the display, key pad, computer, data memory, CO2/H2O gas analysers, flow control system and battery are contained in a single, hand-held chassis. Everything required to measure photosynthesis, transpiration, stomatal conductance, PAR and internal CO2 is conveniently included in one easy to operate instrument. Because the chamber is connected directly to the CO2/H2O differential gas analysers, there is virtually no delay when measuring CO2/H2O in the chamber. These features make the CI-340 not only the smallest, but the fastest and most accurate Handheld Photosynthesis System available for field applications.

– World’s lightest and most portable complete Photosynthesis System.
– Measures photosynthesis, transpiration, stomatal conductance, and internal CO2 concentration in open or closed environments.
– Control heat, light, water and gas exchange for precise data.
– 9 custom chambers suiting any application, including conifer needles.
– Soil Respiration Chamber available.

CI-340 Handheld Photosynthesis System Features

  • An entire photosynthesis system in one handheld case
  • Lightweight and truly portable
  • Stable analyser for accurate CO2 and H2O measurements
  • Open and closed system measurements
  • 9 interchangeable chambers for different types of leaves
  • Soil respiration chamber and plant canopy attachment available
  • Modular attachments include light, temperature control, CO2/H2O supply and chlorophyll fluorescence measurement
  • Automatically controls light, temperature, and CO2/H2O concentrations in the leaf chamber
  • Infrared non-contact leaf temperature measurement
  • Measures chlorophyll fluorescence and photosynthesis simultaneously

The CI-340 is a highly technologically advanced photosynthesis system. It contains a pump along with a mass airflow sensor. A built-in microprocessor regulates the airflow rate, which is set by the user. The measurement process begins with an air/gas sample passing a solid-state CO2 analyser. The output of the analyser is amplified, sampled by an analogue-to-digital (A-D) converter, and sent to the microprocessor. The processor averages these readings and corrects them for any non-linearity present in the analyser. A relative value of CO2 concentration is continually updated by the microprocessor. Each reading reflects sampling taken every second during a specified time period. This can be determined by setting the time interval. The rate at which samples are saved in memory is determined by the “sampling rate” or the time interval input at the beginning of each measurement session.


Main System

Main Unit: On board IRGA for CO2/H2O Analysis, Flow Control, Display and Key Board, Leaf Chamber attachment facility and Battery.
Display: LCD 40 x 6 characters or 320 x 60 pixel
Data Storage: 4 MB Internal FLASH RAM
Data output: USB or RS232C PC Link Cable
Flow Rate: 100 ~ 1000 cm2 min-1 (1 lpm)
Power supply: 7.2 VDC, 3.2 mAh for 5 hours continuous use, extended hours of use with additional batteries.
AC Adapter / Battery Charger supplied.
Weight: 1.5 Kg (3 Lbs) with Battery
Dimension: 450 mm x 53 mm x 48 mm

CO2 Analyser

Sensor: Low power Non-Dispersive Infrared Gas Analyser. No sensitivity to motion, Stable analyser for accurate CO2 measurements
Chopping frequency: 1Hz
Sensors response time: 35 seconds
Source life: 5000 hours
Measuring Range: 0 to 2000 ppm (Standard) – 0 to 3000 ppm (Optional)
Resolution: 0.1 ppm
Repeatability: ±0.1 ppm (short term)
Accuracy: < ± 2% up to 3000 ppm
Sample cell: 100 mm x 10.2 mm (3.94” L x 0.40” Dia)
Warm-up time: Approximately 3 minutes

H2O Analyser

Sensor Type: Humidity Sensitive Capacitor.
Stable Analyser for accurate H2O measurements
Measuring Range: 0 to 100%
Resolution: 0.1%
Accuracy: ±2% at 10% RH, ±3.5% at 95% RH
Response time: <15 sec

PAR Measurement

Sensor Type: Filtered GaAsP – Photodiode
Measuring Range: 0 ~ 2500 µmol m-2s-1
Accuracy: ±5 µmol m-2s-1
Response time: 400 ~ 700nm

Chamber Temperature Measurement

Sensor Type: Thermocouple
Measuring Range: – 15 ~ 50°C
Accuracy: ±0.1°C

Leaf Temperature Measurement

Sensor Type: Infrared Sensor
Measuring Range: – 10 ~ 50°C
Accuracy: ±0.3°C

Specifications are subject to change.