The oxygen cells supplied by drager generally contains s shelf life of 15 months or usage time of 12 months (whichever is earlier). The life of O2 cell greately depends upon the O2 contact hours.
Here, you have not mentioned about which O2 cell you are talking. Is it on-line cell or side-stream monitoring oxygen cell. It has been observed that sidestream o2 cells are totall non-reliable in their performance after 4 months (although they carry usage life of 6 months).
