Patent ID: 6543466
Filing Date: 2003-04-08
Classification: G05D,Y10T

Abstract:
A mass flow controller, comprising:a flow input port located on a lower end of the controller; a flow output port located on the lower end of the controller; a sensor unit in fluid connection with the input port and the output port; a first channel for carrying a first amount of fluid from the input port to the output port; a second channel for carrying a second amount of fluid through the sensor unit, wherein the second amount is less than the first amount; an orifice assembly coupled to the output port, wherein the orifice assembly has at least one orifice opening; a magnetic field generator coupled between the orifice assembly and the sensor, wherein the magnetic field generator, in response to the sensor unit, generates a magnetic flux in a direction from the sensor unit to the orifice assembly to allow flow through the at least one orifice opening; and a bypass assembly coupled between the sensor unit and the orifice assembly, wherein the bypass assembly comprises grooves to allow fluid to flow through, and wherein the magnetic flux travels through the bypass assembly.