Sanyo MCO-19M Service Manual page 38

<O2 span calibration>
1. In Top Screen, press MENU key and select "Tools".
2. Press ENTER key to display "Select Tools (1/2)" and select "Temp/CO2/O2 Calibration".
3. Press ENTER key to display "Temp/CO2/O2 Calibration (1/2)".
4. Input a O2 measured value in the right side of "O2 Span".
5. Press MENU key and select "OK".
6. Press ENTER key to start O2 calibration automatically.
Perform O2 calibration until display CO2 density corresponds to actual CO2 density.
Note) It is impossible to perform O2 span calibration when setting O2 density deviates from 18.0~22.0%.
There is a blank in the right side of "O2 Span" column.
Ex. When O2 density setting is 5.0% and actual O2 density is 4.5%;
0 Measure O2 density by sampling port in the front of inner door.
1 In Top Screen, press MENU key and select "Tools".
2 Press ENTER key to display "Select Tools (1/2)" and select "Temp/CO2/O2 Calibration".
3 Press MENU key and select "OK".
4 Press ENTER key to display "Temp/CO2/O2 (1/2)". Input "4.5" in the right side of "O2
Span" column.
5 Press MENU key and select "OK".
6 Press ENTER key to return the display to "Select Tools (1/2)".
Procedures
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MENU key
Tools
OK
OK