This shows that the relationship between the sensitivity of the Hall effect is proportional to the magnetic induction intensity of the external magnetic field. The Hall element belongs to this active magnetoelectric conversion device, is a magnetistlectifact component. It is based on the principle of Hall effect. It is made of integrated packaging and assembly process. It is convenient to convert magnetic input signals into electrical signals in practical applications, while also have an industrial application actual application easy to operate and reliability. Requirements. The Hall switch is made of this feature of the Hall element. Its input is characterized by magnetic induction strength B, and when the B value reaches a certain degree (such as B1), the trigger inside the Hall switch flip, The output level of the Hall switch also flips. The output is generally used in transistor output, and other sensors are similar to NPN, PNP, normally open, normally closed, latch (bipolar), and dual signal output. The Hall switch has a risk of contact, low power, long service life, high response frequency, and an epoxy resin blocking is integrated, so it can work reliably in various harsh environments. 
When the magnetic object is proximally proximally, the Hall element on the switch detecting surface changes the internal circuit state of the switch due to the Hall effect, thereby identifying that there are magnetic objects in the vicinity, and then control The pass or break of the switch. The detection object of this proximity switch must be a magnetic object.