Protective system for a multiple channel transformer probe

Details Protective system for a multiple channel transformer probe Protective system for a multiple channel transformer probe

G - Physics

01

P

G01P 3/487 (2006.01) G01D 5/20 (2006.01) G01P 13/00 (2006.01) H01F 27/28 (2006.01) H01F 38/14 (2006.01)

Patent

CA 2691313

The invention provides a transformer probe for sensing movement of a body of magnetic material, having multiple output channels wherein the output in each output channel is substantially unaffected by faults in other output channels. The transformer probe comprises a magnetically energisable pole piece, a sensing circuit comprising an electricai circuit having a portion, remote from the pole piece, which forms first and second transformer primary coils, a first output circuit comprising a first transformer secondary coil, inductively coupled to the first primary coil via a first transformer core, and terminated by a first load resistance, and means for measuring an output signal from the secondary circuit, a second output circuit comprising a second transformer secondary coil, inductively coupled to the second primary coil via a second transformer core and terminated by a second load resistance and means for measuring an output signal from the second secondary coil, and an inductive coupling, or resistive electrical component, connected across each primary coil, having an impedance within the sensing circuit such that a change from a normal circuit condition to an open circuit condition within the first or second output circuit does not significantly affect the voltage across the first and second primary coils.

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