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    • 7. 发明专利
    • Automatic zero point correction device for pressure sensor, pressure control device and pressure type flow control device
    • 压力传感器自动零点校正装置,压力控制装置和压力型流量控制装置
    • JP2005010108A
    • 2005-01-13
    • JP2003177135
    • 2003-06-20
    • Fujikin IncTadahiro OmiTokyo Electron Ltd忠弘 大見東京エレクトロン株式会社株式会社フジキン
    • OMI TADAHIROSUGIYAMA KAZUHIKOHINO SHOICHITAKAHASHI EIJISAEGUSA SHINIKEDA SHINICHINISHINO KOJIDOI RYOSUKEUENOYAMA TOYOMISUGITA KATSUYUKI
    • G01L19/02G01L19/00G01L19/04
    • G01L19/02G01L9/065G01L19/0023G05D7/0635
    • PROBLEM TO BE SOLVED: To provide a pressure sensor capable of detecting accurately the pressure regardless of its using period by correcting automatically the temporal zero point drift of the pressure sensor, and a pressure control device and a flow control device using it. SOLUTION: This pressure sensor using a semiconductor pressure-sensitive element for measuring liquid pressure is operated as follows: a sensor output voltage from the pressure sensor is outputted to the outside through an amplifier; the sensor output voltage is inputted into a temporal zero point drift correction means of the pressure sensor through a D/A converter; it is determined whether the sensor output voltage is larger than a set value or not by a sensor output determination means in the temporal zero point drift correction means; an operation condition of the pressure sensor is determined by an operation condition determination means in the temporal zero point drift correction means; and when the sensor output voltage is larger than the set value and the operation condition of the pressure sensor is under the operation condition set beforehand, a zero point correction voltage having the same voltage as the sensor output voltage and the reverse polarity thereto is inputted into an offset terminal of the amplifier through the D/A converter and the temporal zero point drift of the pressure sensor is deleted. COPYRIGHT: (C)2005,JPO&NCIPI
    • 要解决的问题:提供一种能够通过自动校正压力传感器的时间零点漂移以及使用该压力传感器的压力控制装置和流量控制装置来精确地检测压力而不管其使用周期的压力传感器。 解决方案:使用半导体压敏元件测量液体压力的压力传感器如下操作:来自压力传感器的传感器输出电压通过放大器输出到外部; 传感器输出电压通过D / A转换器输入压力传感器的时间零点漂移校正装置; 通过时间零点漂移校正装置中的传感器输出确定装置确定传感器输出电压是否大于设定值; 压力传感器的操作条件由时间零点漂移校正装置中的操作条件确定装置确定; 并且当传感器输出电压大于设定值并且压力传感器的操作条件处于预先设置的操作条件下时,将具有与传感器输出电压相同的电压和与其相反极性的零点校正电压输入到 通过D / A转换器的放大器的偏移端子和压力传感器的时间零点漂移被删除。 版权所有(C)2005,JPO&NCIPI