Process transmitter isolation assembly
AssigneeRosemount Inc.
InventorDavid A. Broden
Life of this patent
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Abstract
An isolation assembly for connection to a process transmitter and for mitigating high temperature effects of a process fluid includes a process coupling face having an isolation diaphragm configured to contact process fluid. A transmitter coupling has a pressure coupling configured to couple to a pressure port of the process transmitter. A temperature isolation fluid conduit extends between the process coupling face and the transmitter coupling and carries an isolation fluid which couples a pressure applied to the isolation diaphragm to the pressure coupling to minimize high temperature effects of the process fluid on the process transmitter.
Claims21
An isolation assembly for connection with a process transmitter and for mitigating high temperature effects of a process fluid, comprising:
- a process coupling face having a first isolation diaphragm extending in a first plane and configured to contact process fluid;
- a transmitter coupling having a first pressure coupling extending in a second plane and configured to couple to a first pressure port of the process transmitter;
- a first temperature isolation conduit extending between the process coupling face and the transmitter coupling which couples the first isolation diaphragm to the first pressure coupling such that the thermal conduction path of the process fluid is increased between the process coupling face and the transmitter coupling;
- and
- an isolation fill fluid in the first conduit configured to transfer an applied pressure from the first isolation diaphragm to the first pressure coupling.
A pressure transmitter assembly, comprising:
- a pressure transmitter having an isolation diaphragm configured to couple to a pressure and having an output related to pressure applied to the isolation diaphragm;
- an isolation assembly configured to mount to the isolation diaphragm of the pressure transmitter and having a process coupling isolation diaphragm configured to couple to a process pressure and transfer the process pressure to the pressure transmitter isolation diaphragm;
- and
- wherein the output from the pressure transmitter is compensated based upon temperature characterization of the pressure transmitter and of the isolation assembly.
A method of reducing heat transfer between a process fluid and a pressure transmitter, comprising:
- coupling a process coupling face of an isolation assembly to a process pressure;
- coupling a pressure transmitter to a pressure transmitter coupling of the isolation assembly;
- applying a process pressure to an isolation diaphragm of the isolation assembly and transmitting the applied pressure to an isolation diaphragm of the pressure transmitter through an isolation fluid in the isolation assembly.
A method of characterizing a sensed pressure applied to a pressure transmitter as a function of temperature, comprising:
- coupling a temperature isolation assembly to the pressure transmitter;
- applying a pressure to an isolation diaphragm of the isolation assembly and thereby applying the pressure to an isolation diaphragm of the transmitter by conveying the applied pressure through an isolation fluid in the isolation assembly to the isolation diaphragm of the pressure transmitter;
- changing the temperature of the pressure transmitter and isolation assembly;
- and
- characterizing an output of the pressure transmitter as a function of applied pressure and temperature.
Dependencies are inferred from the claim text.