Magnetic field sensing for tamper identification

Details Magnetic field sensing for tamper identification Magnetic field sensing for tamper identification

G - Physics

01

R

G01R 33/02 (2006.01) G01R 11/24 (2006.01) G01R 33/07 (2006.01) H02J 13/00 (2006.01)

Patent

CA 2427553

The present technology involves a method and apparatus for detecting and reporting magnetic fields in the proximity of a utility meter as an approach to determining tampering of such meter. The sensitivity level of the magnetic field sensors may be adjustable allowing either remote or local sensitivity adjustments to a magnetic field sensor to compensate for variations in the electromagnetic environments of different meter installation sites. Alternatively, the output of each magnetic field sensor may be connected to the input of an adjustable threshold circuit. When the output voltage of the magnetic field exceeds a predetermined threshold voltage, a magnetic event signal is generated. Threshold adjustments to the adjustable threshold circuit may be performed locally at the meter site or remotely from a station. The output of each magnetic field sensor may be monitored by a locally or remotely programmable magnetic sensor output monitor. Such magnetic sensor output monitor generates a magnetic event signal when a predetermined number of magnetic sensors have been activated.

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