Technical information

PHOTOSYNTHESIS, TRANSPIRATION AND STOMATAL CONDUCTANCE
3/31/2008 Rev. 4.3 7-5
Note: The tubing accessory should not be kinked or restricted during operation. A replacement
tube can be used; it should be of vinyl or polyurethane material and approximately 5” long. Tygon
B-44-3 is normally used because it does not absorb much moisture.
Figure 7-2 (top). Tubing schematic for a closed system. Figure 7-3 (bottom). Tubing schematic for
an open system. A supplied filter should be connected between the inlet and the tubing.
The closed system recirculates the air in the system; the open system sends a constant flow of external
air into the system. There are five available sizes of leaf chambers to conduct experiments for the
open system method (Table 7-1). Generally, the manufacturer recommends choosing a chamber large
enough to contain the leaf environment (i.e., using a leaf larger than the chamber area would produce
inaccurate results).
Determine the best size chamber (Table 7-1) for the measurements to be taken. Proceed to insert and
attach the leaf chamber to the CI-340. Refer to the LEAF CHAMBER — CARE AND USE chapter
for proper applications of the leaf chamber(s). Then press the
or and key(s) to
begin the measurement process.
Table 7-1. Open system chamber sizes:
Chamber Types Window Size (W x L mm) Window Area (cm
2
)
Square 25 x 25 6.25
Narrow Rectangular 65 x 10 6.5
Wide Rectangular 55 x 20 11
Small Cylindrical 25 x 90 22.5