Patent ID: 6259220
Filing Date: 2001-07-10
Classification: B05B,F04B

Abstract:
A pressure controller for a pumping system, comprising:a transducer connected to receive a physical indication of pressure in a fluid being pumped, said transducer converting said physical indication into an electrical response;a transducer interface circuit connected to said transducer for sensing said electrical response, said transducer interface circuit having a variable gain responsive to a gain control circuit and producing a transducer interface output which is the multiplicative product of said electrical response and said variable gain, said output providing a pump control signal for the pumping system;a pressure control circuit which provides a pressure control signal representative of the desired pressure at which the pumping system's pressure is to be controlled;wherein said pressure control signal is coupled to said gain control circuit to control the variable gain of said transducer interface circuit, thereby varying said gain to bring the fluid's pressure to the desired pressure.