COMBUSTIBLE GAS SENSING ELEMENT WITH CANTILEVER SUPPORT

• US 20180024091A1
• Filed: 07/31/2017
• Published: 01/25/2018
• Est. Priority Date: 04/19/2016
• Status: Active Grant

• Current Assignee: Industrial Scientific Corporation (Fortive Corp.)
• Original Assignee: Industrial Scientific Corporation (Fortive Corp.)
• Inventors: Wang, Chuan-Bao, Salvetti, Kathryn, Wang, Yong
• Granted Patent: US 10,533,965 B2
• Time in Patent Office: Days
• CPC Class Codes: G01N 27/4075 Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts
• CPC Class Codes: G08B 21/16 Combustible gas alarms
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A catalytically activated combustible gas sensing element includes a filament of resistance wire forming a coil, wherein a first end of the resistance wire is attached to a first support post and a second end of the resistance wire is attached to a second support post, a cantilever support supporting the coil, wherein the cantilever support is attached to a third support post, and a catalytic bead substantially surrounding the coil and cantilever.

Claims

1. A catalytically activated combustible gas sensing element, comprising:

a filament of resistance wire forming a coil, wherein a first end of the resistance wire is attached to a first support post and a second end of the resistance wire is attached to a second support post;

a cantilever support supporting the coil, wherein the cantilever support is attached to a third support post; and

a catalytic bead substantially surrounding the coil and cantilever.

2. The gas sensing element of claim 1 wherein the resistance wire is coated via chemical vapor deposition with an insulating material preventing winds of the coil from electrically conducting through an exterior surface of the wire.

3. The gas sensing element of claim 1 wherein the cantilever support is attached to the resistance wire.

4. The gas sensing element of claim 3 wherein the cantilever support is attached to the resistance wire by soldering.

5. The gas sensing element of claim 3 wherein the cantilever support is attached to a single coil of the resistance wire.

6. The gas sensing element of claim 3 wherein the cantilever support is attached to more than one, but not all coils of the resistance wire.

7. The gas sensing element of claim 3 wherein the cantilever support is attached to all coils of the resistance wire.

8. The gas sensing element of claim 1 wherein the cantilever support is disposed within, but does not contact the resistance wire.

9. The gas sensing element of claim 1 wherein the cantilever support is disposed below the resistance wire.

10. The gas sensing element of claim 1 wherein the cantilever support is disposed above the resistance wire.

11. The gas sensing element of claim 1 further comprising a bead enveloping the cantilever support and the resistance wire.

12. The gas sensing element of claim 11 wherein the bead comprises a catalytic material.

13. The gas sensing element of claim 12 wherein the catalytic material comprises one or both of platinum or palladium.

14. The gas sensing element of claim 11 wherein the bead comprises a ceramic material.

15. The gas sensing element of claim 11 wherein the bead comprises an inner layer of a porous oxide-supported precious metal catalyst and an outer layer of a porous oxide-supported catalytic material.

24. The gas sensing element of claim 1 further comprising a bead enveloping the cantilever support and the resistance wire.

25. The gas sensing element of claim 24 wherein the bead comprises a catalytic material.

26. The gas sensing element of claim 25 wherein the catalytic material comprises one or both of platinum or palladium.

27. The gas sensing element of claim 24 wherein the bead comprises a ceramic material.

28. The gas sensing element of claim 24 wherein the bead comprises an inner layer of a porous oxide-supported precious metal catalyst and an outer layer of a porous oxide-supported catalytic material.

16. A catalytically activated combustible gas sensing element comprising:

a filament of resistance wire forming a coil, wherein the resistance wire is of a diameter equal to or less than 0.5 millimeters, wherein a first end of the resistance wire is attached to a first support post and a second end of the resistance wire is attached to a second support post; and

a cantilever support adapted to support the coil, wherein the cantilever support is attached to a third support post;

wherein the resistance wire can withstand more than eight drops of one meter onto concrete without breakage.

17. The gas sensing element of claim 16 wherein the cantilever support is attached to the resistance wire.

18. The gas sensing element of claim 17 wherein the cantilever support is attached to a single coil of the resistance wire.

19. The gas sensing element of claim 17 wherein the cantilever support is attached to more than one, but not all coils of the resistance wire.

20. The gas sensing element of claim 17 wherein the cantilever support is attached to all coils of the resistance wire.

21. The gas sensing element of claim 16 wherein the cantilever support is disposed within, but does not contact the resistance wire.

22. The gas sensing element of claim 16 wherein the cantilever support is disposed below the resistance wire.

23. The gas sensing element of claim 16 wherein the cantilever support is disposed above the resistance wire.

29-97. -97. (canceled)