Section 3
Operation 3-5
The Main window displays the CO
2
concentration (ppm), as well as the status of various LI-
820 parameters. There are also three menus used to configure the LI-820, perform zero and
span calibrations, and set up the parameters for recording data. The LI-820 parameters in this
window are as follows:
Parameter Description
Cell Temperature Temperature (°C) in the LI-820 optical cell. This value should
remain near 50 °C when the heater is turned ON.
Cell Pressure Barometric pressure (kPa) measured in the LI-820 optical cell. This
value can be used to correct CO
2
measurements for the effects of
pressure fluctuations on gas density.
Heater Shows status of heater (ON/OFF), which is used to maintain the
optical cell at a constant 50 °C. The heater is turned ON/OFF in the
Settings window.
Pressure Comp.
Shows whether pressure compensation is ON/OFF. When ON, CO
2
measurements are corrected for the effects of pressure fluctuations
on gas density.
Alarms Shows status of High and Low alarms, whose values are set in the
Settings window. Alarms are enabled (ON), or disabled (OFF).
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