TARGAS-1 Operation Manual V. 1.02
53
Settings 1 Menu
Device Mode
To select the operational mode of the TARGAS-1
RB
To set the r
b
factor for cuvette. The initial value recorded at the PP Systems’
factory is written on the “Tested” label affixed to the PLC handle.
RS Fact
To set the RS factor for leaf photosynthesis
Zero
Change/view the settings associated with the zero (zero type and time interval
for performing zeros).
Graph
To set the range Y Axis for the graph in the Injection Process.
Reset Abs
To indicate that absorber material has been replaced and reset.
Back Button
Returns to the Main Menu.
Right Arrow
Continues to the Settings 2 Menu screen.
Device Mode Settings
This function allows the user to change/view the Device Mode used by the TARGAS-1. The TARGAS-1
has one CO
2
IRGA and one H
2
O IRGA. In Absolute mode and Closed mode, gas is sampled
continuously from the GAS IN port and CO
2
and H
2
O concentration is updated every 1.0 second. In the
Differential mode and the PLC modes, gas is sampled alternately from the GAS IN port which represents
the reference gas, and the PLC port which represents the analysis gas. At the default gas switching
frequency of 5 seconds, the reference readings CO2r and H2Or will be updated every 10 seconds; the
analysis readings CO2a and H2Oa will also be updated every 10 seconds, but at 5 seconds after the
reference values are updated. Other values such as temperature, flow and calculations are always
updated every 1.0 second. The switching frequency can be adjusted in the Settings 3 menu as Ref On
Time and An On Time.
