Shellab 2002-S2E - Manual (Page 3)

INSTALLATION AND OPERATING INSTRUCTIONS
Attach tubing from the gas tank regulators to the fittings marked GAS LINE IN on the rear
panel of the TANK SWITCH. Attach a length of tubing from the fitting marked GAS LINE
OUT to incubator.
OPERATING INSTRUCTIONS
Set regulators to proper operating pressures. Both regulators should be set to 15 psi. It
does not matter which tank is attached to which input fitting. When one tank is empty, the
gas line will change to the other tank automatically. At this time the empty tank can be
replaced. Note: there are no alarms to indicate when the tanks are empty so tank pressure
should be checked on a regular basis to ensure that both tanks do not run empty. When an
empty tank is replaced, simply set the regulator on the partial tank to a value of 15 psi but
never more than 20 psi.
Replacing a tank:
1. Remove regulator from empty tank.
2. Attach regulator to new tank and decrease pressure to 15 psi.
This process will allow you to always keep your FULL tank on stand-by.
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. Ensure that you are using a dual stage regulator.
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.
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.
Section
1