O2 Cell Calibration – Menu Page 19

O2 Cell Calibration is used to calibrate the oxygen sensor. The oxygen sensor is calibrated using air (20.9% O₂) as the reference. If the oxygen cell output is outside of a 30% band then the message REPLACE O₂ CELL! will appear near the bottom of the screen. When calibrating the O₂ sensor, no special gas is required, only fresh ambient air.  It is better to perform this calibration in an office or outside to be sure that the process gas does not influence the ambient air.  After the pump has been on for long enough for the readings to stabilize (approximately one minute), press the Enter key to begin the calibration process. A calibration complete message will appear when the calibration is finished.