专利汇可以提供Apparatus for measuring the mass flow of gases专利检索,专利查询,专利分析的服务。并且The disclosed apparatus measures the mass rate of flow of gas through an orifice of a flow nozzle under critical flow conditions and comprises a reservoir having an inlet connected to a source of high pressure through a first valve and an outlet connected to a flow nozzle adapted to conduct pressurized gas from said reservoir under critical flow conditions to a region of low pressure downstream of the flow nozzle. The critical flow conditions are established by a second valve mounted downstream of the nozzle orifice. Density and pressure measuring devices are coupled to the reservoir and provide signals representative of the density and pressure, respectively, of the gas flowing through the flow nozzle. The density and pressure signals are applied to a device which calculates the square root of the product of density and pressure to provide a signal proportional to the mass rate of gas flow. In a first embodiment, the second valve is operatively coupled to the calculating device in order that this device provides a signal only when the second valve is opened. In a second embodiment the density measuring device is operatively coupled to the first valve in order to maintain the density of the gas flowing through the flow nozzle at a constant value.,下面是Apparatus for measuring the mass flow of gases专利的具体信息内容。
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