What does a "door operator" in an elevator system do?

A door operator in an elevator system is specifically responsible for controlling the opening and closing of the elevator doors. This mechanism ensures that the doors operate smoothly and safely, allowing passengers to enter and exit the elevator when it reaches their desired floor. The door operator plays a critical role in maintaining safety, as it is designed to prevent the doors from closing when an obstruction is detected, helping to protect passengers.

The other options pertain to different functions within the elevator system. Regulating elevator speed is handled by the elevator's motor and control system, which ensures a smooth ride and manages acceleration and deceleration. Monitoring passenger weight is a function performed by weight sensors, which can be used for overload protection; the elevator will not operate if the weight exceeds its rated capacity. Detecting emergency situations involves various safety systems that monitor the overall operation and condition of the elevator, but this is distinct from the functionality of the door operator itself.