Patent ID: 7849750
Filing Date: 2010-12-14
Classification: G01L

Abstract:
1. In a Bourdon pressure gauge which includes a Bourdon tube which is provided in a body and expands by a pressure, a spiral or helical displacement gear which is connected with one end of the Bourdon tube for converting a displacement degree into a circular movement, a shaft which is provided in the body and is connected with the displacement gear and rotates, and a LCD which senses a rotation value of the shaft and displays the senses value, a sensing apparatus of a Bourdon pressure gauge, comprising: a magnet which has a N pole and a S pole at one end between both ends of the shaft which is connected with the displacement gear and rotates; a sensing unit which is provided in the body at a portion corresponding to the magnet and is disposed on at least three portions in circular directions and includes an AMR sensor or hall sensor for sensing the rotation value of the magnet; and a display control unit which receives a sine signal value and a cosine signal value among phase signal values from the sensors of the sensing unit and corrects the phase values and outputs to the LCD.