CID BioScience Handheld Photosynthesis system.

£ 20,969.45 (inc VAT)£ 17,474.54 (exc VAT)


SKU : CI-340 Category :


The CI-340 Handheld Photosynthesis System is a portable, single-handed tool that measures photosynthesis, respiration, transpiration, stomatal conductance, PAR and internal CO?2. Light-weight and durable, the CI-340 was designed for field use. The optional accessory modules allow researchers to control CO2, H2O, temperature, light intensity, and measure chlorophyll fluorescence, while the ten different customized chambers accommodate any leaf size, including conifer needles and cacti. Direct chamber connection to the CO2/H2O gas analyzer reduces measurement delay and enables rapid measurement of gas exchange with minimal delays.

Harvest Agri Ltd is the UK distributor for CID BioScience of USA and will be happy to provide more details, answer queries and provide service. See Contact us. However, please feel free to check their excellent website at “” or contact them directly at 01 (360) 833 8835 or by email at

Technical Data

  • Lightweight and optimized for single-handed operation
  • Stable analyzers for accurate CO2 and H2O measurements
  • Accommodates open and closed system measurements
  • Infrared, non-contact leaf temperature measurement
  • Ten interchangeable chambers customized for different leaf types
  • Custom soil respiration chamber
  • Control modules for light, temperature control, CO2 / H2O supply and chlorophyll fluorescence measurement

Chlorophyll fluorescence and photosynthesis measured simultaneously


Ecologists use the CI-340 to measure  seasonal changes in photosynthetic rate  as a response to temperature shifts.

Agronomists use the CI-340 to measure water status of crop plants across  related genotypes.

Horticulturalists use the CI-340 to  measure changes in leaf physiology  as a result of drought stress.

  • To see a full list of application resources including published research with the CI-340 Handheld Photosynthesis System, please visit:

Theory of Operation

Theory of Operation


Photosynthesis is the formation of carbohydrates from CO2 and a source of hydrogen (as water) in the chlorophyll-containing tissues of plants exposed to light. Photosynthetic rate is determined by measuring CO2 before and after it enters the leaf chamber to calculate the rate of CO2 assimilation by a known leaf area.
See the calculation.


Transpiration is the movement of water vapor from leaf tissue into the atmosphere. Transpiration rate is determined by measuring water vapor before and after it enters the leaf chamber to calculate the rate of water vapor flux per one-sided leaf area.
See the calculation.

Stomatal Conductance

Stomatal conductance refers to the openness of the leaf stomata determines the rate of CO2 assimilation into the leaf and water vapor exits the leaf through the stomata. Stomatal conductance is calculated by measuring transpiration rate as a function of leaf temperature.
See the calculation.

Open or Closed System

The CI-340 is easily operable as either an open and closed system. In open system measurement, the incoming gas is drawn from the ambient, or control-module altered, air and the exhaust returns to the external atmosphere. During closed system measurements, the air is recirculated from the exhaust back into the chamber.
See the calculation.

Absolute and Differential Readings

The CI-340 is designed to measure both absolute and differential readings. In Absolute Mode, the CI-340 measures gas concentrations from a single source. For differential measurements, the concentration of gases from both the inlet of the chamber and the chamber exhaust are measured.



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£ 20,969.45 (inc VAT)£ 17,474.54 (exc VAT)

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