System and apparatus for sustaining process temperature measurement for RTD lead wire break

Patent metadata

Field	Value
Publication number	US-10310462-B2
Application number	US-201615147231-A
Country	US
Kind code	B2
Filing date	May 5, 2016
Priority date	May 5, 2016
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

Method and apparatus for sustaining process temperature measurement with respect to a lead wire break. A resistance temperature device can include a group of lead wire arms including lead wire arms of a first lead wire type and a second lead wire type. An operation can occur to automatically switch from a first lead wire type configuration to a second lead wire type configuration in the resistance temperature device having the plurality of lead wire arms including the first lead wire type and the second lead wire type, if one or more wire breaks occurs in one or more the lead wire arms.

First claim

The invention claimed is:

1. A method for sustaining process temperature measurement with respect to a lead wire break, said method comprising:
configuring a resistance temperature device to comprise a plurality of lead wire arms including lead wire arms of a first lead wire type and a second lead wire type; and
automatically switching from a first lead wire type configuration to a second lead wire type configuration in said resistance temperature device having said plurality of lead wire arms including said first lead wire type and said second lead wire type, if at least one wire break occurs in at least one arm of said plurality of lead wire arms of said resistance temperature device,
wherein said resistance temperature device includes a controller that is electrically connected to a current source via a first switch and to a current sink via a second switch, and
wherein said automatically switching from the first lead wire type configuration to the second lead wire type configuration includes 4 to 3, 3 to 2, 4 to 2, 2 to 4, 2 to 3, and 3 to 4 configurations based on said controller detecting a break in at least one wire arm of the plurality of wire arms.

2. The method of claim 1 , wherein said resistance temperature device (RTD) configured to be a 2-wire RTD if at least one wire break occurs in at least one arm of said plurality of lead wire arms of said resistance temperature device.

3. The method of claim 1 , wherein said resistance temperature device (RTD) configured to be a 3-wire RTD if at least one wire break occurs in at least one arm of said plurality of lead wire arms of said resistance temperature device.

4. The method of claim 1 , wherein said resistance temperature device (RTD) comprises a 4-wire RTD.

5. The method of claim 1 , wherein said resistance temperature device includes a controller that is electrically connected to said plurality of lead wire arms and to a current source via a first switch and to a current sink via a second switch, wherein said controller assists in automatically switching from said first lead wire type configuration to said second lead wire type configuration.

6. The method of claim 5 , wherein said controller comprises a multiplexing circuit with respect to at least one analog input among said plurality of lead wire arms.

7. An apparatus for sustaining process temperature measurement with respect to a lead wire break, said apparatus comprising:
a resistance temperature device comprising a plurality of lead wire arms including lead wire arms of a first lead wire type and a second lead wire type; and
wherein a first lead wire type configuration automatically switches to a second lead wire type configuration in said resistance temperature device having said plurality of lead wire arms including said first lead wire type and said second lead wire type, if at least one wire break occurs in at least one arm of said plurality of lead wire arms of said resistance temperature device,
wherein said resistance temperature device includes a controller that is electrically connected to a current source via a first switch and to a current sink via a second switch, and
wherein said automatically switching from the first lead wire type configuration to the second lead wire type configuration includes 4 to 3, 3 to 2, 4 to 2, 2 to 4, 2 to 3, and 3 to 4 configurations based on said controller detecting a break in at least one wire arm of the plurality of wire arms.

8. The apparatus of claim 7 , wherein said resistance temperature device includes a controller that is electrically connected to said plurality of lead wire arms.

9. The apparatus of claim 7 , wherein said controller comprises a multiplexing circuit with respect to at least one analog input among said plurality of lead wire arms.

10. The apparatus of claim 7 , wherein said resistance temperature device (RTD) configured to be a 2-wire RTD if at least one wire break occurs in at least one arm of said plurality of lead wire arms of said resistance temperature device.

11. The apparatus of claim 7 , wherein said resistance temperature device (RTD) configured to be a 3-wire RTD if at least one wire break occurs in at least one arm of said plurality of lead wire arms of said resistance temperature device.

12. The apparatus of claim 7 , wherein said resistance temperature device (RTD) comprises a 4-wire RTD.

13. An apparatus for sustaining process temperature measurement with respect to a lead wire break, said apparatus comprising:
a resistance temperature device configured to comprise a plurality of lead wire arms including lead wire arms of a first lead wire type and a second lead wire type, wherein a first lead wire type configuration automatically switches to a second lead wire type configuration in said resistance temperature device having said plurality of lead wire arms including said first lead wire type and said second lead wire type, if at least one wire break occurs in at least one arm of said plurality of lead wire arms of said resistance temperature device; and
a controller that is electrically connected to said plurality of lead wire arms and to a current source via a first switch and to a current sink via a second switch, wherein said controller assists in automatically switching from said first lead wire type configuration to said second lead wire type configuration,
wherein said automatically switching from the first lead wire type configuration to the second lead wire type configuration includes 4 to 3, 3 to 2, 4 to 2, 2 to 4, 2 to 3, and 3 to 4 configurations based on said controller detecting a break in at least one wire arm of the plurality of wire arms.

14. The apparatus of claim 13 , wherein said controller comprises a multiplexing circuit with respect to at least one analog input among said plurality of lead wire arms.

Assignees

• Honeywell Int Inc

Inventors

• Kumar Beeram Chaitanya
• Singh Sarabjit
• Malve Sharath Babu
• Digiulian Anthony F

Classifications

• G05B15/02 Primary

  electric · CPC title

• G01K15/007

  Testing · CPC title

• G01K7/20 Primary

  in a specially-adapted circuit, e.g. bridge circuit · CPC title