CI-340 Operation Manual rev. 6/7/2017
CID Bio-Science
1554 NE 3
rd
Ave
Camas, WA 98607, USA
Phone: +1 (360) 833-8835
Fax: +1 (360) 833-1914
[email protected]
www.cid-inc.com
1
Introduction
The CI-340 Hand-held Photosynthesis System is the smallest, fastest and highly accurate infrared gas
analyzer available for both field and laboratory photosynthesis measurements. The CI-340 is
lightweight and utilizes a compact solid-state design concept in which the entire system (display,
keypad, computer, data memory, CO
2
/H
2
O gas analyzer, flow control system and battery) is contained
in a single, hand-held durable case. Measurements of photosynthesis, transpiration, stomatal
conductance and internal CO
2
can be taken with minimal sample degradation because the chamber is
connected directly to the CO
2
/H
2
O differential gas analyzer. The short distance between the analyzer
and the leaf chamber decreases the possibility of leaks, water vapor change, or temperature change,
therefore keeping the integrity of the sample high. The unit is designed to perform several
measurements, such as photosynthesis and transpiration rates and stomatal conductance, as well as
measure the absolute and differential CO
2
concentrations of a leaf or plant. The unit can also be
calibrated easily by the user to ensure quality measurements and data, which can be easily transferred
to a computer using the included USB connector. The functions of the CI-340 are described in further
detail in Table 1 and the following sections.
Table 1: Several different functions of the CI-340 with descriptions of each measurement.
Function
Description
Photosynthesis Rate
Rate at which a known area of leaf assimilates CO
2
over time
Transpiration Rate
Rate at which water vapor accumulates on a leaf over time
Stomatal Conductance
Overall water loss of the leaf, determined using transpiration
rate and leaf surface temperature
Absolute Mode
Measures CO
2
concentration (ppm) from a single source (intake
of the instrument)
Calibration
Allows user to check or adjust unit to known standards,
increasing data quality
Data Transfer
Transfers saved data files from unit to a computer
Infrared Gas Analysis (IRGA)
Infrared gas analysis (IRGA) measures heteroatomic trace gases based on the absorption wavelength of
infrared (IR) light as it passes through an air sample. Heteroatomic gas molecules consist of two or
more different atoms (e.g. CO
2
, H
2
O, NH
3
, CO, NO, N
2
O). Monatomic gas molecules consist of a single
atom (e.g. O
2
, N
2
) and do not absorb IR radiation or interfere with determining the concentration of
heteroatomic gases using infrared light. Carbon dioxide (CO
2
) strongly absorbs intermediate infrared
wavelengths. Infrared gas analyzers (IRGAs) measure the reduction in the transmission of infrared
wavelengths caused by the presence of a gas between the radiation source and a detector. The
measured reduction in transmission is a function of the concentration of the gas. IRGAs are commonly
used to measure carbon dioxide and water concentrations, as well as photosynthesis. There are two
main types of IRGA, dispersive and non-dispersive, which differ according to the specificity of the gas
type that is being measured.
Содержание CI-340
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