Patent ID: 8138751

Claim:
A rotation sensing device, comprising: a magnetic apparatus comprising a first magnet and a second magnet, the magnet apparatus configured to be mounted to a dial apparatus of a meter; a first magnetic field sensor configured to be mounted to a dial cover, wherein a distance between the first magnet of the magnet apparatus and the first magnetic field sensor is a function of a magnetic field strength of the first magnet and a sensitivity of the first magnetic field sensor; and a second magnetic field sensor configured to be mounted to the dial cover, wherein a distance between the second magnetic field sensor and the first magnet is a function of the magnetic field strength of the first magnet and a sensitivity of the second magnetic field sensor, and wherein the first magnetic field sensor is configured to generate a first signal based upon a sensed magnetic field of the first magnet and the second magnetic field sensor is configured to generate a second signal based upon the sensed magnetic field of the first magnet, and wherein the dial apparatus of the meter comprises a dial hand, and the magnet apparatus is configured to be coupled to the dial hand of the dial apparatus.