gravity separator modular precision sizer seed processing GRAVITY SEPARATOR (for your industrial food separating needs) The gravity separator and destoner, also known as an air table, fluidized bed separator or pneumatic separator, separates dry, granular, free-flowing material according to particle density. To effect a separation on any gravity separator, the same principles apply. Once they are understood, it is usually a simple step to adjust a gravity separator to produce optimum separation. The term " gravity separator" is a contraction of the proper name "Specific Gravity Separator," which means, a separator of particles differing in their specific gravities.