A field device system for use in an industrial process includes a field device configured to couple to the industrial process and monitor or control the industrial process. The method provides a hybrid software and hardware solution to take advantage of the useful attributes of both. The length of the regenerative materials is L which meets the requirement of X\u2212L>0. The methods use a thermal bond oxide or a combination of a thermal and deposited oxide. The shank of the bolt is such that, in use, the shank of the bolt projects beyond the security nut in its installed position, and the key having an aperture to receive the projecting end of the bolt shank. Apparatus include in particular designs for trapping particles in SMR’s for extended measurement periods.