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PRESSURE TRANSMITTER HAVING AN ISOLATION ASSEMBLY WITH A TWO-PIECE ISOLATOR PLUG

  • US 20150020600A1
  • Filed: 07/19/2013
  • Published: 01/22/2015
  • 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 having a base with a process end coupled to an interior cavity formed in the housing;

    a sensor for sensing the pressure;

    an isolating assembly mounted at the process end of the housing and isolating fluid in the process line from the interior cavity, the isolating assembly comprising;

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

    an isolator plug positioned in the process of the housing adapter, the isolator plug having a lower plug portion providing a first end surface adjacent the isolation diaphragm, an upper plug portion 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.

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