초록 ▼

A process control instrument adapted to provide an output indicative of a parameter of a process fluid is disclosed. The process control instrument is designed to be attachable to a flange having a first passageway filled with process fluid. A body of the process control instrument has an opening ad

A process control instrument adapted to provide an output indicative of a parameter of a process fluid is disclosed. The process control instrument is designed to be attachable to a flange having a first passageway filled with process fluid. A body of the process control instrument has an opening adjacent to the first passageway adapted to receive process fluid from the first passageway. An isolation diaphragm is positioned in the opening of the body and separates the opening and the first passageway from a second passageway. A weld ring positioned in the opening is adapted to evenly distribute an attachment force across a support surface such that damage to the isolation diaphragm is minimized.

대표청구항 ▼

[ What is claimed is:] [17.] A transmitter for providing an output indicative of a pressure of a process fluid, the transmitter adapted to be attached via an attachment force to a flange having a first passageway adapted to be filled with process fluid, the transmitter comprising:a body having an op

[ What is claimed is:] [17.] A transmitter for providing an output indicative of a pressure of a process fluid, the transmitter adapted to be attached via an attachment force to a flange having a first passageway adapted to be filled with process fluid, the transmitter comprising:a body having an opening adapted to be positioned adjacent to the first passageway and adapted to receive process fluid from the first passageway when the transmitter is attached to the flange, the body also having a second passageway filled with a first fluid and extending from a location adjacent the opening to a sensing means for providing a pressure related output, the body also providing a substantially planar circumferential support surface in the opening surrounding the second passageway;an isolation diaphragm positioned in the opening of the body and adapted to separate the opening and the first passageway from the second passageway and thereby adapted to prevent process fluid from entering the second passageway, the isolation diaphragm being attached to and at least partially covering the support surface surrounding the second passageway;a seal positionable against the flange; andweld ring means positioned in the opening for attaching the isolation diaphragm to the support surface, for supporting the seal against the flange when the transmitter is attached to the flange, and for providing a substantially planar contact surface adapted to evenly distribute the attachment force across the support surface when the attachment force increases to a level which deforms the weld ring means.