Pressure sensor, pressure controller and temp drief corrector of pressure type flow controller

开发一种压力传感器、压力控制装置及流量控制装置，可以自动地修正压力传感器的温度漂移，且即使温度变动，仍可正确地检测出压力。本发明的压力式流量控制装置的温度漂移修正装置是在压力式流量控制装置上使用的温度漂移修正装置，该压力式流量控制装置在节流装置4与控制阀22之间设有检测上游侧压力P#-[1]用的上游侧压力传感器10，在根据上游侧压力P#-[1]运算通过节流装置4的流量的同时，还通过控制阀22的开闭来控制通过节流装置4的流量，该压力式流量控制装置的温度漂移修正装置由测定流体温度的温度传感器14、存储流体温度T与上游侧压力传感器10的输出漂移的关系的存储机构64、以及温度漂移修正机构构成，其中，温度漂移修正机构是在流体温度T发生变化的情况下，根据存储机构64的数据运算上游侧压力传感器10的输出漂移量，根据该运算输出漂移量消除上游侧压力传感器10的输出漂移，从而修正温度漂移。利用该结构，可自动地修正压力传感器的温度漂移，进行正确的流量控制。 A pressure sensor, a pressure controller and a flow controller in which the pressure can be detected accurately regardless of temperature variation by correcting temperature drift of the pressure sensor automatically. The temperature drift corrector of a pressure type flow controller comprises an upstream side pressure sensor (10) interposed between orifice (4) and a control valve (22) and detecting the upstream side pressure P . The pressure type flow controller for controlling flow rate at the orifice (4) by opening/closing the control valve (22) while operating the flow rate at the orifice (4) based on the upstream side pressure P comprises a temperature sensor (14) for measuring the fluid temperature, a memory means (64) for storing the relation between the fluid temperature T and the output drift of the upstream side pressure sensor (10), and means for correcting temperature drift by operating the output drift of the upstream side pressure sensor (10) from the data of the memory means (64) when the fluid temperature T is varied and eliminating the output drift of the upstream side pressure sensor (10) by the output drift thus operated. According to the arrangement, temperature drift of the pressure sensor is corrected automatically and accurate flow control is ensured.