Hall Effect sensors work on the principle of Hall effect theory, which states that voltage will be generated when a current-carrying conductor is placed onto a magnetic field. The strength of the generated voltage is perpendicular to the field and current. The Hall element consists of a thin conductor sheet and output connections placed perpendicular to the direction of the current flow, both integrated on a circuit chip. When current passes through conductor plates, the charge carriers flow in a straight line. However, the application of a magnetic field disturbs the straight line flow, with electrons deflecting to one side and positive holes to another side. Placing a meter between the two sides enables taking the measurement of the generated voltage. The voltage is proportional to the strength of the magnetic field. Hall Effect sensors are used in any application where the quantity to be sensed is capable of incorporating a magnetic field. It is the main component in devices that sense temperature, position, current or pressure. Hall Effect sensors are a preferred choice owing to their true solid state, with no moving parts and a long life . They are capable of operation at standstill and at high speeds over 100 kHz. Reed sensors are similar to Hall Effect sensors in use but have moving parts.
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