Advantages of Hall Effect Sensor | disadvantages of Hall Effect Sensor
This page covers advantages and disadvantages of Hall Effect Sensor. It mentions Hall Effect Sensor advantages or benefits and Hall Effect Sensor disadvantages or drawbacks. It is also known as Hall Sensor.
What is Hall Effect Sensor?
• When current is flowing through the length of a conductor, and a magnetic field is applied across the width of conductor, the field generates a force which causes electrons/holes to accumulate asymmetrically on the opposite sides. This is known as "Hall Effect".
• Hall effect sensor components contain amplifier circuitry in addition to sensing element. It uses open collector output and a comparator/schmitt trigger to provide some hysteresis.
• The figure-1 depicts hall effect current sensing >>.
• There are four variants of hall effect sensor viz. unipolar hall sensor, bipolar hall sensor, omnipolar hall sensor and linear hall sensor.
Benefits or advantages of Hall Effect Sensor
Following are the benefits or advantages of Hall Effect Sensor:
➨It uses robust solid state components.
➨It can be miniaturized for surface mount applications.
➨It is available at very low cost.
➨It offers fast response and there is no contact bounce.
➨It is extremely durable with almost unlimited lifetime.
➨It's performance is not significantly affected due to dust or dirt unlike optical switch.
Drawbacks or disadvantages of Hall Effect Sensor
Following are the drawbacks or disadvantages of Hall Effect Sensor:
➨It requires separate magnet for its operation. It should be mounted such that it does not affect other components.
➨The open collector output is limited to about 20mA or less.
➨It may be vulnerable to magnetic fields.