7404-10 Operations Manual
Rev A 7/25/2014
Page 37 of 82
The CO
2
gas supply should be 99.5% pure and
should not contain a siphon tube. Gas pressure
to the unit must be regulated to less than 30
psig. Failure to do so could cause tubing to
burst.
Built In Gas Guard System (GASG302)
An optional built in gas guard system is available to allow two tanks of CO2 to be
connected to an incubator requiring approximately 15 psig of gas pressure. The unit is
designed to automatically switch from the primary tank to the secondary tank when low
gas pressure of approximately 10 psig is detected on the primary tank. This allows for a
continuous supply of CO2 to an incubator after the primary tank is empty. In addition,
the user is notified of a tank empty scenario via an audible and visual alarm.
The CO
2
gas supplies must be equipped with two stage regulators to ensure that the
incoming gas to the unit is regulated to appropriate levels. The high pressure stage
should have a 0-2000 psig range, and the low pressure gauge should adjust from 0-30
psig. When connecting the gas supplies, adjust each tank output to 20-25 psig. If the
appropriate regulators are not available, contact CARON customer service to purchase
them.
Once the cylinder regulators are installed and adjusted on each tank, connect the outlet
of the regulator on Tank 1 to the hose barb fitting labeled Tank 1 on the back of the unit.
Repeat the process for Tank 2. Turn on the regulated gas supplies and check the
connections closely for leaks.
To access the internal Gas Guard,
Settings
Button
