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Isolation system for process pressure measurement

A pressure and isolation membrane technology, applied in the direction of measuring devices, measuring fluid pressure, instruments, etc.

Active Publication Date: 2015-05-27
ROSEMOUNT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Often these field applications are subject to stringent and changing environmental conditions which challenge the designers of such transmitters

Method used

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  • Isolation system for process pressure measurement
  • Isolation system for process pressure measurement
  • Isolation system for process pressure measurement

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Embodiment Construction

[0013] Some aspects and embodiments of the present invention arise from a unique understanding of problems that have plagued the art of isolation system design. In particular, industrial process fluid pressure transmitters that measure hot industrial fluids such as steam typically exhibit large errors under both "steady state" and transient conditions. These measurement errors are common in process fluid pressure measurement transmitters that measure gauge or absolute pressure using a single diaphragm isolator. Additionally, these measurement errors also exist in remote seal systems and differential pressure measurement systems.

[0014] When measuring very hot process fluids with a single isolated gauge or absolute pressure transmitter, the electronics and temperature compensating sensor are often located away from the resilient metal process fluid isolation diaphragm. This is especially true when measured at process fluid temperatures that are substantially higher than typi...

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Abstract

A process fluid pressure transmitter includes a pressure sensor, transmitter electronics, and an isolation system. The pressure sensor has an electrical characteristic that changes with pressure. The transmitter electronics are coupled to the pressure sensor to sense the electrical characteristic and calculate a pressure output. The isolation system includes a base member, and isolation diaphragm, and a fill-fluid. The isolation diaphragm is mounted to the base member and interposed between the pressure sensor and a process fluid. The fill-fluid is disposed between the isolation diaphragm and the pressure sensor. The base member and the isolation diaphragm are constructed from different materials such that the coefficient of thermal expansion of the isolation diaphragm is larger than the coefficient of thermal expansion of the base member.

Description

[0001] This application is a divisional application. The original application of this application is a PCT patent application entering the Chinese national phase. The PCT application number of the original application is PCT / US2009 / 046060, and the filing date is June 3, 2009; the international publication number of the original application is WO2009 / 0152004, and the international publication date is December 17, 2009; the Chinese patent application number of the original case: 200980121145.4, entered the Chinese national phase on December 6, 2010. The full text of the original specification is provided below for reference. Background technique [0002] Industrial process pressure transmitters measure the pressure of industrial process fluids such as slurries, liquids, steam, or gases in chemical, pulp, oil, gas, pharmaceutical, food, and / or other fluid handling equipment. Industrial process fluid pressure transmitters are often placed near the process fluid, or in field appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L19/00G01L19/06
CPCG01L19/0046G01L19/0645
Inventor 大卫·A·布罗登
Owner ROSEMOUNT INC