ELECTRICAL INTERCONNECT FOR PRESSURE SENSOR IN A PROCESS VARIABLE TRANSMITTER

• US 20160091382A1
• Filed: 09/30/2014
• Published: 03/31/2016
• Est. Priority Date: 09/30/2014
• Status: Active Grant

• Current Assignee: Rosemount Incorporated (Emerson Electric Company)
• Original Assignee: Rosemount Incorporated (Emerson Electric Company)
• Inventors: Haywood, Nicholas John
• Granted Patent: US 9,638,600 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01L 13/00 Devices or apparatus for measuring differences of two or more fluid pressure values
• CPC Class Codes: G01L 19/0069 from the sensor to its support
• CPC Class Codes: G01L 19/0084 to the outside of the housing other details about the housing see G01L19/14
• CPC Class Codes: G01L 19/0092 Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature G01L9/025, G01L9/045, G01L9/065, G01L9/085, G01L9/105, G01L9/125, G01L19/02, G01L19/04 take precedence; measuring two or more variable G01D21/02; temperature sensors with pressure compensation G01K1/26
• CPC Class Codes: G01L 9/0041 Transmitting or indicating the displacement of flexible diaphragms
• CPC Class Codes: G01L 9/0075 using a ceramic diaphragm, e.g. alumina, fused quartz, glass
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details

Abstract

A process fluid pressure sensor assembly includes a pressure sensor configured to sense a pressure of a process fluid. The assembly includes a pressure sensor body formed of an insulating material. The pressure sensor includes a plurality of electrical contact pads which couple to a pressure sensing element of the body of the pressure sensor. An interconnect body is configured to fit over an end of the pressure sensor body. A plurality of electrical connectors carried in the interconnect body are in electrical contact with the plurality of electrical contact pads. A wiring harness attaches to the interconnect body and includes a plurality of wires which are electrically connected to the plurality of electrical connectors.

Claims

1. A process fluid pressure sensor assembly, comprising:

a pressure sensor configured to sense a pressure of a process fluid comprising a pressure sensor body, the pressure sensor including a plurality of electrical contact pads which couple to a pressure sensing element of the pressure sensor;

an interconnect body which fits over an end of the pressure sensor body;

a plurality of electrical connectors carried in the interconnect body which are in electrical contact with the plurality of electrical contact pads; and

a wiring harness attached to the interconnect body comprising a plurality of wires which are electrically connected to the plurality of electrical connectors.

2. The process fluid pressure assembly of claim 1 wherein at least one of the plurality of wires of the wiring harness comprises a coaxial cable.

3. The process fluid pressure assembly of claim 1 wherein the interconnect body includes an opening configured to receive a proximal end of the pressure sensor.

4. The process fluid pressure assembly of claim 1 wherein the plurality of electrical connectors include feet which are configured to electrically contact the electrical contact pads carried on the pressure sensor.

5. The process fluid pressure assembly of claim 4 wherein the feet are bonded to the electrical contact pads.

6. The process fluid pressure assembly of claim 1 wherein the plurality of electrical connectors are electrically connected to the plurality of electrical contact pads by wire bonds.

7. The process fluid pressure assembly of claim 1 wherein the pressure sensor includes a temperature sensing element electrically connected to the plurality of electrical contact pads.

8. The process fluid pressure assembly of claim 1 wherein the pressure sensor comprises an elongate body formed of a single crystal material.

9. The process fluid pressure assembly of claim 1 wherein a proximal end of the wiring harness includes a plurality of RF connectors configured to connect the plurality of electrical wires to transmitter electronics.

10. The process fluid pressure assembly of claim 1 wherein the interconnect body includes a distal lip configured to couple to the pressure sensor.

11. The process fluid pressure assembly of claim 1 wherein the interconnect body includes a potting compounds configured to provide strain relief to the wiring harness.

12. The process fluid pressure assembly of claim 1 wherein the interconnect body includes at least one tab configured to be bonded to a sensor capsule which carries the pressure sensor.

13. The process fluid pressure assembly of claim 1 wherein the plurality of electrical connectors comprise traces which are deposited on the interconnect body.

14. The process fluid pressure assembly of claim 13 wherein the interconnect body includes a plurality of vias for connecting to the plurality of traces.

15. The process fluid pressure assembly of claim 1 wherein the plurality of electrical connectors comprise traces on a circuit board of the interconnect body.

16. The process fluid pressure assembly of claim 15 wherein the circuit board includes a plurality of vias for connecting to the plurality of traces.

17. The process fluid pressure assembly of claim 1 wherein the interconnect body is formed of a plastic.

18. A pressure transmitter configured for subsea operation including transmitter electronics coupled to the pressure sensor assembly of claim 1.

19. The pressure transmitter of claim 18 wherein the transmitter electronics are electrically connected to the plurality of wires of the wiring harness.

20. The pressure transmitter of claim 18 wherein the transmitter electronics couples to a process control loop.

21. The process fluid pressure assembly of claim 1 including a second pressure sensor connected to a second wiring harness by a second interconnect body.

22. The process fluid pressure assembly of claim 21 wherein the pressure sensor and the second pressure sensor are carried in a sensor capsule.