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🚪 How Automatic Doors Sense and Move

Trace how automatic doors detect approach, separate activation from safety sensing, move through a control sequence, and choose safer responses to faults.

lessons

~12 min

to learn

🤖 Technology

subject

Adults

level

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What you’ll learn

A door is a small control systemExplain how activation, control logic, movement, and safety feedback cooperate in an automatic door.An automatic door is a feedback system rather than a switch. Sensors report conditions, the controller chooses a state, and the operator moves the door.
Different sensors answer different questionsDistinguish motion activation from presence and obstruction sensing.Radar and infrared technologies can serve different roles. The useful distinction is the question a sensor answers and the physical zone it covers.
Fail-safe behavior puts safety firstDescribe fail-safe behavior as a system-level response shaped by safety, accessibility, and egress requirements.Stopping, reversing, holding open, and restricted modes are possible safe responses. The right response depends on the door, the fault, and the building function.

Questions this course answers

What is the main job of an activation sensor?

Activation sensing reports a likely request for passage; presence and obstruction sensing answer different safety questions.

Put the door-control sequence in order

The controller needs an input before it commands movement, and safety sensing continues after movement begins.

Match each sensing or control job to its best description

The jobs overlap in a complete system but are not interchangeable: approach, continued occupancy, and obstruction are distinct conditions.

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