公开(公告)号：US20250110001A1

公开(公告)日：2025-04-03

申请号：US18477736

申请日：2023-09-29

Applicant: Rosemount Inc.

Inventor： Charles R. Willcox ,  Nicholas E. Meyer ,  David J. Hillman ,  David M. Strei

IPC: G01L9/04

Abstract: A pressure transmitter for sensing a pressure of a process fluid in an industrial process includes a pressure sensor body fluidically coupled to the process fluid configured to receive an applied pressure related to a pressure of the process fluid. The pressure sensor body has a high pressure region configured to deform in response to the applied pressure and a low pressure region configured to deform in response to the applied pressure. A high range resistor bridge circuit is mounted in the high pressure region having a powered node, a common node and an output node and has a resistance which changes in response to pressure applied to the high pressure region. A low range resistor bridge circuit is mounted in the low pressure region and has a powered node, a common node and an output node and having a resistance which changes in response to pressure applied to the low pressure region. A pressure output circuit couples to the output node of the high range resistor bridge and the output node of the low range resistor bridge and provides an output related to the applied pressure based upon a voltage difference between the output node of the high range resistor bridge and the output node of the low range resistor bridge.

公开(公告)号：US20250109992A1

公开(公告)日：2025-04-03

申请号：US18477759

申请日：2023-09-29

Applicant: Rosemount Inc.

Inventor： David M. Strei ,  Nicholas E. Meyer ,  David J. Hillman

IPC: G01K7/18 ,  G01K1/024

Abstract: A process variable transmitter for sensing a cryogenic temperature in an industrial process includes a cryogenic temperature sensor configured to be thermally coupled to an industrial process. The cryogenic temperature sensor has an electrical resistance which changes in response to changes in a cryogenic temperature and the industrial process is at the cryogenic temperature. Resistance measurement circuitry is electrically coupled to the cryogenic temperature sensor and measures a sensor resistance over a resistance range and responsively provides an output related to temperature based upon the measured resistance. Transmitter output circuitry coupled to the measurement circuitry to transmits information related to the cryogenic temperature to a remote location. The cryogenic temperature sensor comprises a polycrystalline silicon sensor including a dopant such that the cryogenic temperature sensor has an electrical resistance which changes over a cryogenic temperature range which is within the sensor resistance range of the measurement circuitry.