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. The
left digit on the digital CO
2
density indicator blinks, and the 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.
Note:
It is important to accurately measure the temperature inside the incubator when calibrating the
temperature. Particularly, the temperature gauge used must have an accuracy of JIS 0.5 Class or better.
The temperature must be measured at several points.
The temperature setting must not change by more than
±
1.0
o
C during calibration. If these values are
exceeded, an error buzzer will sound, the input data will be ignored, and the incubator will return to the
display mode. If it is necessary to change the temperature by more than 1.0
o
C, perform calibration in
several stages over a period of time.
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