PRESSURE TRANSMITTER HAVING AN ISOLATION ASSEMBLY WITH A TWO-PIECE ISOLATOR PLUG
First Claim
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.
1 Assignment
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Accused Products
Abstract
A pressure transmitter connectable to a process line provides an output responsive to a pressure in the process line. The transmitter includes a housing having a base with a process end coupled to an interior cavity formed in the housing, a sensor for sensing the pressure and 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 includes 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. 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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Citations
15 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An isolation assembly for use with a pressure transmitter to couple a pressure sensor to a process pressure in a process line, the isolation assembly comprising:
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an isolation diaphragm configured to be fluidically coupled to the process pressure in the process line; a connector configured to connect to the process line and to fluidically couple the isolation diaphragm to the process pressure; and an isolator plug configured to be positioned in a process end in a housing assembly of the pressure transmitter, 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 configured to be positioned adjacent a sensor cavity in the transmitter in which the sensor is positioned, the isolator plug further having 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 to thereby couple the process pressure to the sensor of the transmitter, 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. - View Dependent Claims (12, 13, 14, 15)
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Specification