[Locococo]

Originally Posted by Kuntizella

..... but it was only used 5 hours ( belonged to a patient).

It really depends in what time the 5 hours were taken. Oxycons are made for working 24/7. If those 5 hours were taken in weeks/month the inside granulate material gets wet and does not dry enough while just running 1 hour. That's the worst for any oxycon. The chirping just says that your oxycon is still working but no more on a level of 5L/hr.
A used oxycon with 5000 hrs can be more powerfull because it's clear the machine was running on a regular basis.

Elke