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Pressure transmitter having an isolation assembly with a two-piece isolator plug

  • US 9,689,769 B2
  • Filed: 07/19/2013
  • Issued: 06/27/2017
  • Est. Priority Date: 07/19/2013
  • Status: Active Grant
First Claim
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1. A pressure transmitter connectable to a process line and providing an output responsive to a pressure in the process line, the transmitter comprising:

  • a housing including a housing adapter having a sensor cavity formed in the housing, the housing adapter providing an opening to the sensor cavity;

    a sensor in the sensor cavity for sensing the pressure;

    an isolating assembly mounted at a process end of the housing adapter and isolating fluid in the process line from the sensory cavity, the isolator assembly mounted in the opening of the housing adapter, the isolating assembly comprising;

    an isolation diaphragm configured to be fluidically coupled to the process pressure in the process line;

    an isolator plug positioned in the housing adapter, the isolator plug having a lower plug portion providing a first end surface adjacent the isolation diaphragm, an upper plug portion aligned with and abutting the lower plug portion and providing a second end surface distally spaced from the first end surface and adjacent a sensor cavity in which the sensor is positioned, a connection mechanism connecting the lower and upper plug portions, and a capillary filled with isolation fluid and extending from the first end surface through the lower and upper plug portions to the second end surface thereby coupling the pressure through the isolation diaphragm and the capillary to the sensor cavity and the sensor, wherein the upper plug portion is formed from a first material and the lower plug portion is formed from a second material having higher corrosion resistance than the first material, wherein the capillary extends through the lower isolation plug portion and the upper isolation plug portion;

    a sensor mount, carried by the upper plug portion and located at least partially in a bore extending inwardly from the second end surface, which mounts the sensor in the sensor cavity, wherein the capillary extends through the lower plug portion, the upper plug portion, which fluidically couples to the sensor through the sensor mount; and

    a connector configured to mount the isolator plug in the housing adapter and couple to process piping.

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