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Automatic N
2
(or O
2
) gas cylinder changeover
This incubator switches the gas supply lines when one N
2
(or O
2
) gas cylinder becomes empty.
Note: An automatic switcher for the CO
2
gas supply lines (MCO-21GC) is available as an optional
accessory.
Perform the following procedure
1. Connect 2 gas tubes to connecting ports A/B for N
2
/O
2
gas pipe. Connecting ports A/B for N
2
/O
2
gas
pipes are located on the left back of the Incubator. (Refer to page 9).
2. Connect a N
2
(or O
2
) gas cylinder equipped with a gas pressure regulator to each gas tube. Refer to
page 17 for information on connecting the gas cylinders. (“Gas cylinder A” is the N
2
(or O
2
) gas cylinder
connected to the connecting port A for N
2
/O
2
gas pipe, and “gas cylinder B” is the N
2
(or O
2
) gas cylinder
connected to the connecting port B for N
2
/O
2
gas pipe.)
3. Open the valves of both gas cylinders.
4. The current N
2
(or O
2
) gas supply line is displayed on the Top Display.
5. The incubator detects that there is no more N
2
(or O
2
) gas in a cylinder when the O
2
density in the
chamber does not increase for a while even after opening the N
2
/O
2
gas valve in the Incubator. It
switches the gas supply line when it detects that there is no more gas. At that time, the following
indications of switching the gas cylinder are provided.
Message display field Display of gas supply
When N
2
(or O
2
) gas gas supply line
switches automatically.
Err02: N
2
/O
2
gas Empty is
displayed.
The character for gas supply line
that is empty blinks.
The gas supply line that is
currently being used is displayed
in reverse video.
To silence the buzzer, press the BUZZER Key. The alarm condition is cleared and normal operation
continues.
Current N
2
/O
2
gas supply line
.
1
T e m p 3 7 . 0
o
C C O 2 5 . 0 % A B O 2 5 . 0 % A B
2
3
4
5
S t a t u s
6
O K
7
.
.
.