hello dear all!
i have a problem wit a PB companion 492A oxygen concentrator:
it only deliver 40% o² at 4L/mn.then afer 2 or 3 minutes it shut down with service alarm on .
the compressor seems to be ok but i wonder how to test the valves or if it is "safe" to open them , according to the age of the machine (1996).
does some one has some workshop tips about it ?
i have also problems with old Devilbiss 505 , no O² flow at all , compressor good , no idea of what to check first.
thanks for reading
jean-michel
