Shellab SCO10A-2 - Manual (Page 10)

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should be changed and the pan cleaned at least once a week to help control contamination and
to maintain proper surface tension.
5.8 CO
2
Supply System and Control System: The CO
2
system is rated for input pressures between
5 to 40 PSI which should never be exceeded at any time
Humidity Pan
PLUMBING DIAGRAM (figure 2)
A. The CO
2
inlet fitting is located at the back of the unit near the top (see Figure 2). It is marked CO
2
TO CHAMBER. A supply hose with in-line CO
2
filter (supplied with your accessories) connects from
the fitting to a CO
2
tank regulator.
B. It is highly recommended that a good quality 0-60 PSI output range DUAL STAGE pressure
regulator be used on the CO
2
tank. The dual stage regulator will have two pressure gauges. The
high pressure gauge (0-4000 PSI) will indicate the pressure within the tank. The low pressure gauge
(0-60 PSI) will indicate the output pressure on the supply hose to the incubator. Do not use single
stage regulators. They will not supply a stable pressure. Just because a regulator has two gauges
does not mean that it is a dual stage regulator. Insure that you are using a dual stage CO
2
regulator.
C. It is normal for the high pressure gauge on your regulator to start out reading 800 to 1000 PSI with a
full tank. The reading will drop to 500 to 800 PSI quickly and will stay there for most of the duration of
the tank. At the end of use the pressure will drop quickly to zero to indicate that the tank is
completely empty. Pure CO
2
is in a liquid state in the tank, and a constant vapor pressure is
generated in the tank above the liquid level. The CO
2
is drawn off of the top as a gas. The same
vapor pressure is maintained as long as any liquid is left in the tank. When the last of the liquid has
evaporated into gas then the pressure will drop rapidly as the gas is drawn off.
D. Only medical grade CO
2
should be used in your incubator. The use of any lesser grade may
damage your incubator and void your warranty.