Oxygen and CO2 Sensors

I have an N reading on one or more cells during the dive on the primary display individual cell-reading screen.
I am having problems calibrating my Primary and or Backup displays.
I am having problems calibrating my CO2 sensor.
There is a lot of information on the CO2 screen accessed from options. Is there a simple explanation of all the meanings and functions?
Optocon Triple O2 Sensor
Information Regarding Sentinel Cell Health

If you have a problem that is not listed here please contact Tehnical Support using our Contact Form.