US 4,833,922 A · Modular transmitter

Abstract

A transmitter provides an output that is indicative of pressure and has two modular transmitter bodies, one including a sensor, and the other having an isolator diaphragm with a substantially non-compressible fluid that transfers movement of the isolator diaphragm to the sensor. The bodies each have mating passageways to transfer non-compressible fluid from one body to the other and are assembled together using a ring of extrusile material disposed around the mating portions of the passageways to seal the passageways together when the transmitter bodies are assembled. The isolation fluid is filled in the passageway of the bodies before the first and second transmitter bodies are assembled. The assembly can be accomplished without complex procedures and still insure that accurate transmitter operation will be obtained.

Claims11

Dependent claims

A transmitter for providing an output indicative of a pressure of a process fluid, comprising:

a first transmitter body having a first passageway filled with isolation fluid and extending from a first port on the first transmitter body to sensing means disposed in the first transmitter body for providing the output;
a second transmitter body having an isolateer diaphragm therein for isolating the process fluid from isolation fluid filling a second passage extending from the isolator diaphragm to a second port on the second transmitter body;
a ring of a separate extrusile material disposed around one of said first and second ports;
and
means for urging the first and second transmitter bodies together such that the ring of extrusile material is extruded by contacting both bodies, sealingly coupling the ring to both th first and second ports and containing a selected quantity of the isolation fluid in the transmitter for coupling pressure from the isolator diaphragm to the sensing means.

2 more elements

A transmitter for providing an output from a sensor, and having two transmitter bodies, a first of said transmitter bodies comprising a sensor, and a second of said transmitter bodies comprising an isolator diaphragm:

passageway means in the each of said transmitter bodies positioned to be aligned with each other for fluid communication there between when the transmitter bodies are mounted together along an interface between the transmitter bodies;
and
a ring of extrusile material surrounding the aligning passageways in the interface between the transmitter bodies when the transmitter bodies are mounted together, said ring of extrusile material being initially in a first shape, and being extruded under compression load as the transmitter bodies are forced together to provide a seal between the transmitter bodies surrounding the passageways, whereby fluid in the passageways is sealingly trapped in such passageways and air is excluded from such passageways as the transmitter bodies are forced together.

Dependencies are inferred from the claim text.

Modular transmitter

Life of this patent

Modular transmitter

Life of this patent

Abstract

Claims11