I don't mean sensors directly attached to the machine. My experience is with NMR spectrometers, which work based on the same principle as MRI machines and have the same superconducting magnets that require liquid helium and nitrogen. And those essentially always have an oxygen sensor in the room somewhere, but not connected to the spectrometer itself.
Yes - that’s what I mean too. GE located theirs in the scanner control room. The other vendors didn’t have them.
I’m going to confirm this as I’m doubting myself now, but the GE one would fail every few years as the sensors have a limited life. It was ear splittingly obvious that they had one.
