Product Name : PS-1210-101Normally Open Door Contact Sensor
A proximity sensor consists of two parts: a magnetic part which contains a permanent magnet inside; and a sensor part which contains a reed switch. When these two magnetic parts get close enough, by electromagnetic induction,it will connect the electrical circuit. And this distance is called "detection distance." Usually, one of these two parts is installed on a stable position, and the other one is installed on a moveable object to connect or disconnect the circuit. This proximity sensor can be used in various scopes. It is used widely in household application such as refrigerator, light switch, water dispenser, house alarm service, washing machine, vending machines. It can also be applied on vehicles such as car doors and car lights. And it can also be used in exquisite medical equipments.