TARGAS-1 Operation Manual V. 1.02
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3).
maxDT
Maximum time for which changes in the chamber CO
2
concentration are
monitored in a given session. This value is defined in CPY – Termination
Settings (Step 3).
Abort Button
Stops the CPY process and returns to CPY – Other Settings (Step 4).
Only the individual CO2 measurements are saved to the USB flash
drive. Process data is discarded.
New Button
Stops the CPY process and returns to CPY – Other Settings (Step 4).
Results are saved to the USB flash drive.
The measurement sequence will terminate when the maxDC or maxDT is reached. If maxDT is reached
first, the message “Time limit” will appear in the status box. If maxDC is reached first, the message “CO2
limit” will appear in the status box.
For more information on the theory and calculation of soil
respiration/canopy assimilation, please refer to Mass Flow
Calculate the mass flow of air (
) entering the cuvette per unit leaf area
The TARGAS-1 mass flowmeter is calibrated to read the volume flow (
(STP). The Ideal Gas molar volume is 22.414 L mol
= projected leaf area (measured in cm
= volume flow (measured in cc min
and all subsequent equations are presented as quantities per unit leaf area. The projected
, and this is the default leaf area used in calculations. However, if measurements
spreadsheet program that allows
recalculation of all gas exchange results with different Leaf Area.
Calculate transpiration rate (
) from the partial pressures of water vapor of the air entering (
out of the cuvette (with the addition of transpired water vapor) is (