Patent ID: 6170512
Filing Date: 2001-01-09
Classification: G05D,Y10T

Abstract:
A flow control device for controlling a flow of a chemical solution supplied by a supply apparatus, the supply apparatus comprising a storage tank for storing the chemical solution, a chemical flow pipe to route the chemical solution into a semiconductor processing room, a pressurizing apparatus to supply gas to the storage tank to make the chemical solution flow into the processing room, the flow control device comprising:a flow sensor installed in the chemical flow pipe for measuring the flow of the chemical solution in the pipe and generating a relative measurement value; anda control unit comprising a set-up apparatus for setting a target value and a processor electrically connected with the flow sensor and the pressurizing apparatus for generating a control signal to the pressurizing apparatus depending on a difference between the target value and the measurement value to adjust the flow of the chemical solution in the chemical flow pipe, until the measurement value reaches the target value.