Fresh Air Setup and Zero Calibration

 

To skip the Zero procedure and move directly to the Calibration Span procedure, push the p button. If no button is pushed for 30 seconds, the device prompts user to perform a Span calibration before returning to the Normal Operation mode.
1. Press and hold the p button in Normal Operation mode for three seconds.
2. If calibration lockout option is selected, enter password.

ZERO CAL? screen is then displayed.

• If calibration lockout option is NOT selected:

ZERO screen displays.

3. With the device exposed to fresh air, press the  button to confirm the ZERO CAL? screen. A sensor refresh and Zero Calibration will occur.
   
 

Alternatively press the q button to execute a Fresh Air setup (FAS). See Turning ON and Fresh Air Setup for more details.

After Zero calibration completes, the device momentarily displays “ZERO PASS” or “ZERO ERR” along with the flag of any sensor that failed.

 

During zero calibration the O2 sensor is also span calibrated to 20.8% O2 fresh air, adjusting the calibration curve as needed. During span calibration, the O2 sensor's accuracy is checked against a known oxygen gas concentration without adjusting the calibration curve.