22
SETTING OF CHAMBER TEMPERATURE AND CO
2
DENSITY
Table below shows the basic procedure for setting the chamber temperature and CO
2
density. The
upper limit alarm temperature setting is also shown in the table. Perform key operations in the sequence
indicated in the table. The example in the table is based on the assumption that the desired temperature
is 37
o
C and CO
2
density is 5 %. Adjustment of the upper limit regulator should be executed after the
chamber temperature reaches the stable condition.
Note:
The unit is set at the factory so that the chamber temperature is 37
o
C and CO
2
control is 0 %.
Allow at least 4 hours until the next setting after setting of desired chamber temperature and setting CO
2
density to 0 %, at the time of first start-up or start-up after no use for long term.
Basic operation sequence (Example: Chamber temperature; 37
o
C, CO
2
density; 5 %)
Description of operation
Key operated
Indication after operation
1 Turn the power switch ON.
----
The current chamber temperature is displayed
in temperature indicator.
2 Press set key.
SET
The left digit blinks.
3
By pressing digit shift key and
numerical value shift key, set the
figure to 37.0.
When pressed, the changeable digit is shifted.
When pressed, the figure of settable digit
changes.
4 Press enter key.
ENT
Set temperature is memorized.
Left digit in digital CO
2
density
indicator blinks.
5
By pressing digit shift key and
numerical value shift key, set the
figure to 05.0.
When pressed, the changeable digit is shifted.
When pressed, the figure of settable
digit changes.
6 Press enter key.
ENT
Set CO
2
density is memorized.
7
(Executed after the chamber
temperature reaches the stable
condition)
Adjust upper limit regulator so that
the alarm temp. is 1
o
C higher than
chamber temperature.
In digital CO
2
density indicator, HI is displayed.
In digital temperature indicator, upper limit temp. is
displayed. The upper limit temp. can be changed
by turning upper limit regulator.
8 Press enter key.
ENT
This is the end of set mode and the indicators
display current temperature and CO
2
density.
Note:
●
In each set mode, if the change of the setting is not necessary, pressing set key (SET) skips to next set
mode.
●
When the CO
2
density is set to 00.0, the control is OFF regardless of chamber density.
●
The upper limit temperature set value will change when the regulator is turned even if the unit is not in
set mode, because the alarm circuit is an independent circuit.
●
In each set mode, the indicator returns to the current temperature and CO
2
density display mode
automatically when 90 seconds has passed without any key operation.
●
Do not use Calibration key (CAL) on the control panel under normal conditions. Pressing calibration key
(CAL) leads the calibration mode. Incorrect operation may cause interferences in the basic functions of
the unit. When the calibration mode is activated by mistake, remain untouched any keys for 90 seconds
to automatically restore the current value indication mode.
