he elevator door operator is the assembly that ensures the elevator door opening and elevator door closing mechanism work. The electrical part includes the elevator door motor, motor speed control device, position switch or encoder; the mechanical part includes the door rail, hanging board, door leaf linkage, etc. Elevator Door Sensor is an elevator device that detects a passenger or an object on the doorway which prevents the doors from closing (usually installed for accessibility). http://www.sanjinelevator.com/elevator-door-operator/