The original electromechanical point level switch, Bin-Dicator® diaphragm-type level controls were the first to enjoy general usage in the industry. Bin-Dicator® controls eliminate bin overflow. empty bins, clogged conveyors, choked elevators and resultant damage and waste. Bindicator offers a Model "A" Bin-Dicator® for light, heavy or explosive materials, Auto-Bin-Dicator® with a stainless steel diaphragm for exterior, side of bin mounting, and Bantam Bin-Dicator® for bins, hoppers and chutes of limited size. How the Bin-Dicator®works: The Bin-Dicator® control is pressure actuated switch for use with free flowing bulk materials at atmospheric pressures.Actuation of the switch is the result of pressure exerted by the bulk material against the diaphragm assembly. De-actuation or switch release is a result of the bulk material clearing away from the diaphragm.