What is a Hall effect switch?
A Hall effect switch turns on in the presence of a magnetic field and turns off when the magnet is removed. A Hall effect latch turns on (closes) when a positive magnetic field is applied and remains on even when the magnet is removed.
What is the use of hall sensor?
Hall sensors are commonly used to time the speed of wheels and shafts, such as for internal combustion engine ignition timing, tachometers and anti-lock braking systems. They are used in brushless DC electric motors to detect the position of the permanent magnet.
What’s the difference between Hall effect and reed switches?
Reed switches also offer a number of benefits when used in extreme thermal conditions, such as in very hot or cold temperatures. Hall effect sensors begin to suffer in terms of performance and reliability in such conditions, whereas reed switches function perfectly in temperatures from -65 OC to +150 OC (Hall effect sensors: -55 OC to +125 OC).
How are Hall effect sensors used in switches?
For example, Hall effect sensors can detect steel blades of a spinning “fan.” The steel blades of the fan pass between a stationary magnet and stationary sensor. When the steel is between the two, the magnetic field is redirected away from the sensor (blocked) and the switch opens. When the steel moves away, the magnet closes the switch.
What’s the difference between a reed sensor and a Hall sensor?
The reed sensor, on the other hand, is a mechanical switch that is only activated by a voltage pulse to switch a load. If it does not receive this pulse, it does not consume any power. This key difference has a variety of consequences for specific applications of both forms of technology. Both technologies have their own specific uses:
Which is the smallest reed switch in the world?
The reed switch may not be able to match the Hall effect sensor in terms of its minimum size, but Standex produces what it believes is the smallest reed switch in the world with a glass envelope that is just under 4mm long. This enables compact reed design that can compete with Hall effect sensors on size.