[Gill Envy]

Greetings ISC folks, some grave concerns have been brought to light that a structural failure of an o2 sensor could lead to co2 bypass in the head. While I've dismantled a retired o2 sensor to see if I could create this problem and found it to quite difficult to reproduce with the batch of cells I have, it does bring up the question that tolerances in manufacturing uniformity or prolonged exposure to caustic moist environments could lead to the tape and housing of the cell to part below the membrane without apparent cause, creating a path of lesser resistance for exhaled air to bypass the scrubber.

Does ISC have any comment on this? Any recommendations for ways to be extra, extra sure this will not happen, as I could see, however rare it might be, that such an occurance would create a sudden and unintuitive life threatening emergency. any suggestions would be greatly appreciated. It seems to me that the easiest precaution would be to find some way of further sealing the two end housing caps of the sensors together. It seems that this issue should ultimately be addressed by the cell manufacturer. A vulcanizing product or plastic solder might just do the trick. your consideration is greatly appreciated.

Sincerely,