Inert gas must be hooked up to the AutoBlock to prevent corrosion to the components in the cabinet of the unit.  The gas must be inert (i.e. Nitrogen or Air) and from a source different from the air in the laboratory.  The input gas should be set to 40 - 100 psi going into the unit.  The Air Inlet Regulator steps this pressure down to 10psi to ensure adequate air flow.