The autosorb iQ is a 2 station physisorption and 1 station chemisorption instrument. It contains 2 de-gassing stations and a TCD controller. It operates by measuring the quantity of gas adsorbed onto or desorbed from a solid surface at some equilibrium vapor pressure by the static volumetric method. The data are obtained by a admitting or removing a known quantity of adsorptive gas into or out of the sample cell containing the solid adsorbent at a constant temperature below the critical temperature of the adsorbate. As adsorption or desorption occurs the pressure in the sample cell changes until equilibrium is established. The quantity of gas adsorbed or desorbed at the equilibrium pressure is the difference between the amount of gas admitted or removed and the amount required to fill the space around the adsorbent. The autosorb iQ software allows data to be plotted on screen, produces a user defined report and plot selection. There is a detailed audit trail and 3 access levels programmable by the administrator. There is 5 software selectable adsorptive gas inputs and separate helium and backfill gas inputs.