Method and apparatus for flexible temperature sensor having coiled element
One example of the present subject matter includes a first elongate section having a first flexible conductor enveloped by a first jacket; a second elongate section having a second flexible conductor enveloped by a second jacket; and an sensor section having an elongate flexible tubular shape, the sensor section housing a resistance temperature detector element which is at least partially coiled and which is resistance welded to the first flexible conductor at a first weld and to the second flexible conductor at a second weld; wherein the sensor section at least partially envelops and overlaps the first elongate section and the second elongate section, with a first band crimping the sensor section to the first elongate section, and a second band crimping the sensor section to the second elongate section, and with the first and second welds disposed between the first and second bands.
1. An apparatus, comprising:
a first elongate section having a first flexible conductor enveloped by a first polytetrafluoroethylene jacket;
a second elongate section having a second flexible conductor enveloped by a second polytetrafluoroethylene jacket; and
an sensor section having an elongate flexible tubular shape, and including polytetrafluoroethylene material, the sensor section housing a resistance temperature detector element which is at least partially coiled and which is resistance welded to the first flexible conductor at a first weld and to the second flexible conductor at a second weld;
wherein the sensor section at least partially envelops and overlaps the first elongate section and the second elongate section, with a first band crimping the sensor section to the first elongate section, and a second band crimping the sensor section to the second elongate section, and with the first and second welds disposed between the first and second bands,
wherein the sensor section has no core for support and the apparatus is adapted to enable sensor flex in use.
2. The apparatus of claim 1 , wherein the at least partial coil of the resistance temperature detector element is coiled around a center axis of the sensor section housing.
3. The apparatus of claim 2 , where the at least partial coil of the resistance temperature detector element includes a plurality of spaced apart coils.
4. The apparatus of claim 3 , wherein the plurality of spaced apart coils are free floating within the sensor section housing.
5. The apparatus of claim 3 , wherein the plurality of spaced apart coils have a winding pitch of from about 0.005 inches to about 0.200 inches.
6. The apparatus of claim 1 , wherein the resistance temperature detector element is soldered to the first conductor and the second conductor.
7. The apparatus of claim 1 , wherein a surface of at least the first jacket includes abrasions.
8. The apparatus of claim 1 , wherein the sensor section housing is at least partially melted.
9. The apparatus of claim 1 , further wherein the first flexible conductor is formed of an alloy that includes aluminum.
10. An apparatus, comprising:
a first conductor having a first insulative jacket;
a sensor section having an annular shape, the sensor section housing a resistance temperature detector element which includes a plurality of spaced apart coils arranged in a helix which are electrically connected to the first conductor and which are interference fitted to an interior wall of the sensor section housing; and
a second conductor having a second insulative jacket, the second conductor electrically connected to the resistance temperature detector element,
wherein the sensor section housing is connected to the first insulative jacket and to the second insulative jacket, and wherein the plurality of spaced apart coils have a winding pitch of from about 0.005 inches to about 0.200 inches and wherein the sensor section has no core for support and is adapted to be flexible in use.
11. The apparatus of claim 10 , wherein the resistance temperature detector element is soldered to the first conductor and the second conductor.
12. The apparatus of claim 10 , wherein the plurality of spaced apart coils are free floating within the sensor section housing.
13. The apparatus of claim 12 , wherein the sensor element is welded to the first conductor with a first weld and the second conductor with a second weld.
14. The apparatus of claim 13 , wherein the sensor section at least partially envelops and overlaps the first insulative jacket and the second insulative jacket, with a first band crimping the sensor section to the first insulative jacket, and a second band crimping the sensor section to the second insulative jacket.
15. The apparatus of claim 14 , wherein the first and second welds are disposed between the first and second bands.
16. The apparatus of claim 10 , wherein the sensor section housing includes polytetrafluoroethylene.
17. The apparatus of claim 16 , wherein the first insulative jacket includes a polytetrafluoroethylene jacket which envelopes the first conductor, and the second insulative jacket includes a polytetrafluoroethylene jacket which envelopes the second conductor.
18. The apparatus of claim 10 , wherein the spaced apart coils are not touching one another.
19. The apparatus of claim 10 , wherein the sensor section housing includes perfluoroalkoxy fluorocarbon.
20. The apparatus of claim 19 , wherein the sensor section housing is at least partially melted.