Patent ID: 6247493
Filing Date: 2001-06-19
Classification: G05D,Y10T

Abstract:
A flow controller comprising,a housing of known volume having an inlet orifice connected to a fluid supply and an outlet delivering a fluid supply, the inlet pressure greater than the outlet pressure, the outlet having a crystalline membrane defining an orifice of precisely known dimensions, the housing supporting reciprocating orifice closure members driven by actuators opening and closing the inlet orifice and the outlet orifice upon command,a pressure and a temperature transducer mounted in the housing, the transducers productive of electrical signals representing pressure and temperature in the housing,a device controller electrically connected to the actuators and receiving the electrical signals from said transducers and from an input set point and flow start and end signals, the device controller signaling the actuators to open and close the inlet orifice and outlet orifice whereby a desired fluid flow through the housing is maintained.