Hello again, eventually (last Friday) got sorted with a 35litre Dewar and Marathon 850 from Air Liquide.
After safety audit, demonstrating then charging the unit, the technician said to leave it 25-30 minutes until some of the liquid had vaporised before using it, by which time he was miles away.
I have used pulsed (on demand) Oxygen since 2006.
I came to use the unit half hour later and although it was fine on 4lts/min on continuous on pulsed at the same rate (maximum for this unit) all it did was p..fff..tt intermittently irrespective of demand.
I contacted AL Monday morning, who said a replacement would be here Tuesday.
At 15:04 Tuesday an AL van pulled up on our front waited 20 seconds and pulled off again.
At 17:00 she who must be obeyed rang AL who advised the unit would be here Wednesday...................I know it's sounding a bit like the "gasman" by F&S..............but she contacted them again on Wednesday. Girl said it had been scheduled for change Tuesday and she'd ring back, this she did, to advise delivery Thursday
Thursday at 11:20 a phone call, "hullo fellah..........where are yer pal?" gave location "sounds like vhe place I waz on Tuesda" it was, I retorted, why didn’t you get out of your van and knock, I asked "couldn’t see vhe 'ouse numba.........only next dors" (wtf?@#!)
Said idiot, (sorry to insult any idiots reading this) put a 10 second burst into unit, told my beloved to leave it 30 minutes said "the ovva guys a pillock.....dunno wot ees takin abowt" left and became "white van man" again.
Never seen the scruffy unkempt life-form before, certainly not the AP calibre we've been used to.
Again the flow rates on continuous are fine 1-6lpm, BUT the unit although functioning (i.e. delivering Oxygen) at 4lpm on demand, gives little O2 when compared with 300 or 400 ltr cylinders with a Conserver or my POC at the same flow rate.
Could any other users please give their experiences of the marathon re: demand flows and from LOX units in general; as on continuous flow I'm getting 3.5-4 hours