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A device, having a container for holding a fluid moving therein and a conductance probe installed therein for providing a conductance signal indicating whether it is in contact with the fluid, features a jiggler arrangement having a jiggler arranged on the conductance probe so as to form a mechanica

A device, having a container for holding a fluid moving therein and a conductance probe installed therein for providing a conductance signal indicating whether it is in contact with the fluid, features a jiggler arrangement having a jiggler arranged on the conductance probe so as to form a mechanical self-cleaning conductance probe, which responds to movement of the fluid, for wiping the conductance probe to keep deposits from building up on the conductance probe. The jiggler arrangement may include one or more grooves thereon so that the jiggler can be loosely fitted on the tip between one or more retaining rings arranged in the one or more grooves. The jiggler arrangement may include one or more retaining rings snap-fit on the tip for loosely arranging and retaining the jiggler on the tip.

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What is claimed is: 1. A device having a container for holding a fluid moving therein and with a conductance probe installed therein for providing a conductance signal indicating whether it is in contact with the fluid, characterized in that the device comprises a jiggler arrangement having a jiggl

What is claimed is: 1. A device having a container for holding a fluid moving therein and with a conductance probe installed therein for providing a conductance signal indicating whether it is in contact with the fluid, characterized in that the device comprises a jiggler arrangement having a jiggler loosely arranged and retained on a tip of the conductance probe responsive to movement of the fluid, for wiping a surface of the conducting element to keep deposits from building up on the same. 2. A device according to claim 1, wherein the jiggler arrangement includes the tip having one or more grooves therein and one or more retaining rings arranged in the one or more grooves so that the jiggler is loosely arranged and retained on the tip. 3. A device according to claim 2, wherein the jiggler is loosely arranged and retained between two retaining rings respectively arranged in two grooves. 4. A device according to claim 1, wherein the jiggler arrangement includes the tip having one or more push-on retaining rings that are snap-fit on the tip so that the jiggler is loosely arranged and retained on the tip. 5. A device according to claim 4, wherein the jiggler is loosely arranged and retained between two retaining rings snap-fit on the tip. 6. A device according to claim 1, wherein the tip is a bare metal tip so as to form a conducting element. 7. A device according to claim 1, wherein the tip is a metal tip wrapped entirely in Teflon or other suitable dielectric so as to form a capacitive element when in contact with the fluid. 8. A device according to claim 1, wherein the jiggler includes one or more radially or axial protruding structures to enhance the responsiveness to the movement of the fluid. 9. A device according to claim 1, wherein the device comprises a probe control for providing an electrical signal to the fluid and sensing the conductance signal from the conductance probe. 10. A device according to claim 1, wherein the device is a hot water boiler including a riser pipe having a tee fitting arranged thereon with a probe control arranged thereon, the probe control having the conductance probe arranged therein and inside the tee fitting that responds to movement of the fluid in the riser pipe. 11. A device according to claim 1, wherein the device is a steam or hot water boiler having a container with a probe control arranged on a side wall thereof; and the probe control having the conductance probe arranged therein and inside the side wall that responds to movement of the fluid in the container. 12. A device according to claim 1, wherein the jiggler has one or more protruding walls, fins or some combination thereof, for enhancing the responsiveness of the jiggler to fluid movement in the container. 13. A device according to claim 12, wherein the one or more protruding walls, fins or some combination thereof, include a circumferential wall having radially extending fins on either or both sides of the jiggler. 14. A device according to claim 13, wherein the radially extending fins are either arched or straight. 15. A device according to claim 1, wherein the jiggler has a disk-like or ring-like shape having an opening for receiving the conducting element of the conductance probe. 16. A device according to claim 1, wherein the jiggler is snap-fit onto the conducting element of the conductance probe and loosely arranged thereon. 17. A device according to claim 1, wherein the device is a boiler having a heating element for boiling water contained therein. 18. A device according to claim 1, wherein the jiggler is made from a material having a specific gravity that allows motion of the fluid to create movement of the jiggler. 19. A device according to claim 18, wherein the jiggler is made from a material having a specific gravity that is substantially similar to the specific gravity of the fluid. 20. A device according to claim 1, wherein the jiggler is made from a material that does not melt up to a predetermined temperature. 21. A device according to claim 1, wherein the jiggler is made from either an electrically conductive material or a non-electrically conductive material.