Quote: (Originally Posted by
jradomski)

this would not be a problem for oxgen asside from cost.. for diluent unless you go to an expensive capacitive sensor you will have issues with helium screwing up the pressure readings after a period of time..
Hmm, are you sure about this?
Plenty of helium gas pressure sensors around, so far mine on Boris has been perfect (Ive used up to 90% He)