公开(公告)号：US09857259B2

公开(公告)日：2018-01-02

申请号：US14501310

申请日：2014-09-30

Applicant: Rosemount Inc.

Inventor： David Andrew Broden ,  Charles Ray Willcox ,  Donald Edward Harasyn

IPC: G01L9/00 ,  G01L11/02 ,  G01L19/06

CPC classification number: G01L9/0075 ,  G01L9/0072 ,  G01L11/025 ,  G01L13/025 ,  G01L19/0038 ,  G01L19/0084 ,  G01L19/0681

Abstract: A capacitance-based pressure sensor for measuring a process variable includes a metal sensor body, a diaphragm disposed within a cavity of the metal sensor to form a deflectable capacitor plate, and an insulator extending through the metal sensor body from an end wall to the cavity. The pressure sensor further includes an isolation tube in fluid connection with the cavity, the isolation tube extending into the insulator through the end wall, a stationary capacitor plate on a surface of the insulator in the cavity, the stationary capacitor plate spaced from the diaphragm, and an electrical lead wire connected to the stationary capacitor plate and extending through the insulator parallel to the isolation tube and exiting the insulator at the end wall. A fill fluid is within the isolation tube and the cavity to apply pressure to the diaphragm.

公开(公告)号：US20150090040A1

公开(公告)日：2015-04-02

申请号：US14039233

申请日：2013-09-27

Applicant: Rosemount Inc.

Inventor： Mark Stephen Schumacher ,  David Andrew Broden

IPC: G01L19/06

CPC classification number: G01L19/06 ,  G01L19/0084 ,  G01L19/0636 ,  G01L19/0645 ,  G01L19/149 ,  Y10T29/49117

Abstract: A pressure measurement system is provided. The system includes a pressure sensing probe extendable into a process fluid and having a pressure sensor with an electrical characteristic that varies with process fluid pressure. A mineral insulated cable has a metallic sheath with a distal end attached to the pressure sensing probe and a proximal end. The mineral insulated cable includes a plurality of conductors extending within the metallic sheath and being spaced from one another by an electrically insulative dry mineral. The proximal end of the metallic sheath is configured to be sealingly attached to a process fluid vessel.

Abstract translation: 提供压力测量系统。 该系统包括可扩展到过程流体中的压力传感探头，并具有具有随过程流体压力而变化的电特性的压力传感器。 矿物绝缘电缆具有金属护套，其远端连接到压力感测探针和近端。 矿物绝缘电缆包括在金属护套内延伸并通过电绝缘干燥矿物彼此间隔开的多个导体。 金属护套的近端构造成密封地附接到过程流体容器。