公开(公告)号：US20200096404A1

公开(公告)日：2020-03-26

申请号：US16137930

申请日：2018-09-21

Applicant: Rosemount Inc.

Inventor： Paul Ryan Fadell ,  Scott Robert Thompson ,  Nathan Darrel Stokes

IPC: G01L9/12

Abstract: A transmitter for measuring a process pressure includes a pressure sensor and a temperature sensor providing an input temperature signal. A first remote pressure sensitive diaphragm couples to the transmitter by a first capillary tube filled with a fill fluid having a density as a function of fill fluid temperature. An input circuit is operably connected to at least the pressure sensor and provides an intermediate pressure signal at least roughly representative of the process pressure. A correcting circuit is coupled to the temperature sensor and to the input circuit. The correcting circuit processes the intermediate pressure signal by compensating for the fill fluid density as a function of the temperature and provides a compensated output more closely representative of the process pressure. The correction circuit further performs an initial height determination based upon a pressure measurement made while no pressure is applied to the first diaphragm.

公开(公告)号：US10816424B2

公开(公告)日：2020-10-27

申请号：US16137930

申请日：2018-09-21

Applicant: Rosemount Inc.

Inventor： Paul Ryan Fadell ,  Scott Robert Thompson ,  Nathan Darrel Stokes

IPC: G01L9/00 ,  G01L9/12 ,  G01L19/04

Abstract: A transmitter for measuring a process pressure includes a pressure sensor and a temperature sensor providing an input temperature signal. A first remote pressure sensitive diaphragm couples to the transmitter by a first capillary tube filled with a fill fluid having a density as a function of fill fluid temperature. An input circuit is operably connected to at least the pressure sensor and provides an intermediate pressure signal at least roughly representative of the process pressure. A correcting circuit is coupled to the temperature sensor and to the input circuit. The correcting circuit processes the intermediate pressure signal by compensating for the fill fluid density as a function of the temperature and provides a compensated output more closely representative of the process pressure. The correction circuit further performs an initial height determination based upon a pressure measurement made while no pressure is applied to the first diaphragm.