Sanyo MCO-19M Service Manual page 37

<CO2 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 CO2 measured value in the right side of "CO2 Span".
5. Press MENU key and select "OK".
6. Press ENTER key to start CO2 calibration automatically.
Perform CO2 calibration until display CO2 density corresponds to actual CO2 density.
Note) It is impossible to perform CO2 span calibration when setting CO2 density is 0.0
There is a blank in the right side of "CO2 Span" column.
Ex. When CO2 density setting is 5.0% and actual CO2 density is 4.5%;
0 Measure CO2 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 "CO2
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