Method of measuring a pressure of a pressurized fluid fed through a diaphragm pump and accumulated in a vessel, and miniature pump system effecting the measurement

摘要

A method and system for determination of a pressure of the pressurized fluid with the use of a diaphragm pump responsible for accumulating the pressurized fluid in the vessel. The pump has a pump cavity and a diaphragm with a piezoelectric element which is actuated by an application of a voltage to displace the diaphragm for pumping a fluid into the vessel. The method comprises the steps of: (a) deactivating the diaphragm by removal of the voltage to the piezoelectric element so as to stop pumping the fluid and accumulating the pressurized fluid into the vessel; (b) introducing the pressurized fluid only from the vessel back into the pump cavity so as to cause a displacement of the diaphragm by the pressurized fluid; (c) deriving an electrical signal indicative of the displacement of the diaphragm; and (d) translating the electrical signal into a corresponding pressure value indicative of the pressure of the pressurized fluid in the vessel.