FP628 failed oxygen leak check:
Helium leak check passed, all systems check passed; segmental oxygen leak check passed the Combustion and Ballast stagebut failed to pressurize at the aliquote doser stage. When PV7 valve was pinched - the system failed - so leak must be down stream of Ballast output and upstream of PV7- narrowing it atthe aliquote doser section.
The aliquote doser C-flex tubing was replaced with new one, dosing valve was cleaned and o-rings checked, cleaned and regreased. Oxygen segmental leak check still failed only at the aliquote doser stage. Could the aliquote doser metal section with the loopbe blocked rather than leaking? If so how do you unblock it? Reply to DLC6173 RE: LECO Corporation - FP628