A system and method for that allows one part of an atomic layer deposition process sequence to occur at a first temperature while allowing another part of the ALD process sequence to occur at a second temperature. The air jets and sifting screens are arranged in a cross sectionally stair step pattern in which the tread of each stair is the screen and the riser of the each stair has the air jet located thereon. The home screen is divided into a plurality of simultaneously displayed panels, with a first panel displays a rate of change of continuously monitored analyte levels in interstitial fluid, a second panel simultaneously displays a current analyte level and an analyte trend indicator, and a third panel displays status information of a plurality of components of the device. Individual rollers are constructed using hard plastic cages which are adhesively bonded in toroidal foam volumes to prevent lateral scrunching or distortion of rollers during use. The FIR includes a track and hold circuit and a summing circuit that provides operational advantages to the FIR filter.