Pressure transmitter with high pressure isolator mounting assembly

A transmitter connectable to a process line and providing an output responsive to a process pressure in the process line with respect to atmospheric pressure, the transmitter comprising:

• a housing forming an inner wall around a hole extending into an interior cavity formed in the housing;
• a sensor for sensing the pressure;
• a circuit coupled to the sensor and providing the output;
• an isolator plug disposed in the hole having:
• a diaphragm therein coupling the process pressure via a first passageway to a distal end of the plug;
• and a second passageway extending from a first surface to a second surface for carrying atmospheric pressure to the sensor.

A transmitter connectable to a process line and providing an output responsive to a pressure in the process line, the transmitter comprising:

• a housing forming a wall around a hole extending into an interior cavity formed in the housing;
• an isolating assembly mounted in the hole isolating fluid in the process line from the interior cavity, the isolating assembly comprising:
• an isolator plug, the isolator plug having a diaphragm for receiving the pressure;
• a connector having a bore extending between first and second spaced ends of the connector;
• the isolator plug including first and second plug portions,
• the first plug portion including a first outer surface having a first outer dimension sized for insertion into the hole formed in the housing and engagement with the wall surrounding the hole;
• and
• the second plug portion including a second outer surface having a second outer dimension sized smaller than the first outer dimension for insertion into the bore of the connector;
• and
• the isolator plug including a stepped surface between the first and second plug portions, the stepped surface having a first mating surface surrounding a first groove, the connector having a second mating surface surrounding a second groove, the connector being disposed such that the first and second grooves open to each other;
• and
• an annular weld joining the first mating surface to the second mating surface.

A transmitter connectable to a process line and providing an output responsive to a pressure in the process line, the transmitter comprising:

• a housing forming an inner wall around a hole extending into an interior cavity formed in the housing;
• an isolator plug, the isolator plug having a diaphragm therein coupling the pressure via a passageway from a diaphragm end to a sensor end thereof;
• a connector having a bore extending from a first end to a second end;
• the isolator plug including:
• first and second plug portions, the first plug portion including a first outer surface having a first outer dimension sized for insertion into the hole formed in the housing and engagement with the wall surrounding the hole, and the second plug portion including a second outer surface having a second outer dimension sized smaller than the first outer dimension for insertion into the bore of the connector;
• and
• a stepped surface between the first and second portions;
• the connector connectable to the process line at the first end and secured to the stepped surface of the isolator plug at the second end;
• an annular weld securing the isolator plug to the connector;
• a sensor for sensing the pressure;
• and
• a circuit coupled to the sensor and providing the output.