34
CALIBRATION
CO
2
calibration
Span setting
Span setting should be done under stable condition of temperature, humidity, and CO
2
density.
1.
Press the calibration key (CAL) once to enter the CO
2
calibration pre-conditioning mode.
2.
Confirm blinking the decimal point in the digital CO
2
density indicator.
3.
Open the outer door and remove the sample air outlet cap on the inner door.
4.
Measure the CO
2
density in the chamber through the sample air outlet on the inner door.
5.
Press the calibration key (CAL) for about 5 seconds again to enter the temperature calibration input
mode.
6.
The left digit on the digital temperature indicator blinks, and the digital CO
2
density indicator goes out.
7.
Press the calibration key (CAL) once again to enter the CO
2
calibration input mode.
8.
The left digit on the digital CO
2
density indicator blinks, and the temperature indicator goes out.
9.
Set the present correct CO
2
density with the digit shift key ( ) and numerical value shift key ( ),
then press the enter key (ENT).
10.
Replace the sample air outlet cap.
11.
The incubator automatically reverts to the display mode.
Note:
This calibration is available when the setting of CO
2
density is 2 % or more.
[Example]
For an internal CO
2
density of 5.0 % (setting) and a measured value of 4.5 %.
1.
Press the calibration key (CAL) once.
2.
Press the calibration key (CAL) for about 5 seconds again.
3.
The “3” on the digital temperature indicator blinks, and the digital CO
2
density indicator goes out.
4.
Press the calibration key (CAL) once again.
5.
The “0” on the digital CO
2
density indicator blinks, and the digital temperature indicator goes out.
6.
Set the present correct CO
2
density (4.5 %) with the digit shift key ( ) and numerical value shift key
( ), then press the enter key (ENT).
7.
The incubator automatically reverts to the display mode.
