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A method and apparatus for detecting a fluid; said method comprising providing one or more oscillators transmitting electromagnetic energy; providing one or more resonant circuits receiving electromagnetic energy from the oscillators; bringing the fluid and the one or more resonant circuits into con

A method and apparatus for detecting a fluid; said method comprising providing one or more oscillators transmitting electromagnetic energy; providing one or more resonant circuits receiving electromagnetic energy from the oscillators; bringing the fluid and the one or more resonant circuits into contact with each other so that the receptions of electromagnetic energy of the resonant circuits are changed; and detecting changes of the transmissions of the oscillators by changes in one or more characteristics thereof upon the changes in the receptions of the electromagnetic energy of the resonant circuits; and use thereof for the detection of fluid levels, empty containers, and leak of fluids from containers and bodies containing said fluids; e.g. for monitoring collection of drain fluid from a human or for monitoring leak of fluid from a human suffering from urinary and/or fecal incontinence. Further, a method and apparatus for detecting a temperature, and sensing devices for sensing an external parameter, in particular a fluid or a temperature.

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A method and apparatus for detecting a fluid; said method comprising providing one or more oscillators transmitting electromagnetic energy; providing one or more resonant circuits receiving electromagnetic energy from the oscillators; bringing the fluid and the one or more resonant circuits into con

A method and apparatus for detecting a fluid; said method comprising providing one or more oscillators transmitting electromagnetic energy; providing one or more resonant circuits receiving electromagnetic energy from the oscillators; bringing the fluid and the one or more resonant circuits into contact with each other so that the receptions of electromagnetic energy of the resonant circuits are changed; and detecting changes of the transmissions of the oscillators by changes in one or more characteristics thereof upon the changes in the receptions of the electromagnetic energy of the resonant circuits; and use thereof for the detection of fluid levels, empty containers, and leak of fluids from containers and bodies containing said fluids; e.g. for monitoring collection of drain fluid from a human or for monitoring leak of fluid from a human suffering from urinary and/or fecal incontinence. Further, a method and apparatus for detecting a temperature, and sensing devices for sensing an external parameter, in particular a fluid or a temperature. se line includes a positive sense signal line, a negative sense signal line, and a trim sense signal line. 8. The apparatus as in claim 1, further comprising: said at least one sense line passes through said second opening. 9. An inductor built into a printed circuit board (hereinafter PC board), comprising: a first electrically conducting trace of said PC board serving as a positive output bus of a power supply built on said PC board; a second electrically conducting trace serving as a negative output bus of said power supply; a ferromagnetic core placed around said first trace and said second trace to form a first inductor by said first trace passing through a first opening in said ferromagnetic core, and to form a second inductor by passage of said second trace through a second opening in said ferromagnetic core; a plurality of sense lines to measure voltage levels in a load to which electrical power is delivered by said positive output bus and said negative output bus, and said plurality of sense lines pass through the said first opening in said ferromagnetic core. 10. The inductor of claim 9, further comprising: said plurality of sense lines includes one sense line to measure negative potential at a load energized by said power supply. 11. The inductor of claim 9, further comprising: said plurality of sense lines includes one sense line to measure positive potential at a load energized by said power supply. 12. The inductor of claim 9, further comprising: said plurality of sense lines includes one sense line to measure potential between a positive connection and a negative connection at a load energized by said power supply. 13. The inductor of claim 9, further comprising: said plurality of sense lines includes a first sense line to measure a negative potential, a second sense line to measure a positive potential, and a third sense line to measure a potential intermediate between said negative potential and said positive potential, all at a load energized by said power supply. 14. An inductor on a PC board, comprising: a positive first trace in said PC board; a negative second trace in said PC board; said first trace passing through a first opening in a ferromagnetic core; said second trace passing through a second opening in said ferromagnetic core; means for arranging an electric current to flow from said first trace, through said first opening in said ferromagnetic core, and back along said second trace through said second opening in said ferromagnetic core, to thereby place inductance made by passage of said first trace and said second trace through said ferromagnetic core in said electric current flow; and means for passing a plurality of sense lines through a said opening in said ferromagnetic core, said plurality of sense lines to measure a voltage level in a load to which electrical power is delivered by said positive output bus and said negative output bus. 15. The inductor of claim 14, further comprising: means for including one sense line of said plurality of sense lines to measure negative potential at a load energized by said power supply. 16. The inductor of claim 14, further comprising: means for including one sense line of said plurality of sense lines to measure positive potential at a load energized by said power supply. 17. The inductor of claim 14, further comprising: means for including one sense line of said plurality of sense lines to measure potential between a positive connection and a negative connection at a load energized by said power supply. 18. The inductor of claim 14, further comprising: means for including in said plurality of sense lines a first sense line to measure a negative potential, a second sense line to measure a positive potential, and a third sense line to measure a potential intermediate between said negative potential and said positive potential, all at a load energized by said power supply. 19. A method for mak