Field device with improved terminations

• US 9,153,885 B2
• Filed: 09/26/2012
• Issued: 10/06/2015
• Est. Priority Date: 09/26/2012
• Status: Active Grant

• Current Assignee: Rosemount Incorporated (Emerson Electric Company)
• Original Assignee: Rosemount Incorporated (Emerson Electric Company)
• Inventors: Schumacher, Mark S.
• Primary Examiner(s): Duverne, Jean F
• Application Number:
  US13/627,479
• Publication Number:
  US 20140087599A1
• Time in Patent Office: 1,105 Days
• Field of Search: 439/801, 439/607.01, 439/92
• US Class Current: 1/1
• CPC Class Codes: H01R 11/05 the connecting locations having different types of direct connections
• CPC Class Codes: H01R 12/515 Terminal blocks providing connections to wires or cables
• CPC Class Codes: H01R 4/44 Clamping areas on both sides of screw

Abstract

A field device is provided. The field device includes field device electronics configured to couple to a transducer. A plurality of terminals is coupled to the field device electronics and is configured to couple the field device to a process communication loop to allow the field device to communicate over the process communication loop. Each of the plurality of terminals is configured to support multiple conductor attachment types.

Claims

1. A field device comprising:

field device electronics coupled to a transducer;

a plurality of loop terminations coupled to the field device electronics and which electrically connect the field device to a process communication loop to allow the field device to communicate over the process communication loop; and

wherein each of the plurality of loop terminations comprises a plurality of different conductor attachment types to couple to a plurality of different types of loop conductors, the plurality of different types of loop conductors comprising at least one of a spade lug and a stripped end of a wire.

2. The field device of claim 1, wherein each of the plurality of loop terminations includes a threaded fastener that is threadably received in a block having a transverse bore sized to receive the stripped end of the wire.

3. The field device of claim 1, wherein the block is conductive.

4. The field device of claim 2, wherein the block is attached to a printed circuit board.

5. The field device of claim 2, and further comprising a lead attachment bracket disposed between a head of the threaded fastener and the block.

6. The field device of claim 5, and further comprising a clamping plate disposed between the head and the lead attachment bracket.

7. The field device of claim 5, wherein the lead attachment bracket extends upwardly at an angle and has at least one aperture for receiving a test clip.

8. The field device of claim 2, wherein the threaded fastener has a bottom surface configured to engage the stripped end of the wire.

9. The field device of claim 8, wherein the threaded fastener includes a lead engagement member.

10. The field device of claim 9, wherein the lead engagement member deflects to deflect as the threaded fastener is tightened on the stripped end of the wire.

11. The field device of claim 10, wherein the lead engagement member is semicircular.

12. The field device of claim 1, wherein the field device is completely powered through the plurality of loop terminations.

13. The field device of claim 1, wherein the transducer is a process variable sensor and wherein the field device electronics include a loop communication module operably coupled to the plurality of loop terminations to convey a signal representative of a process variable measurement from the process variable sensor over the process communication loop.

14. The field device of claim 1, and further comprising a field-hardened enclosure containing the field device electronics.