Proximity Switch & Limit Switch Operate In TSTC Automatic Doors

The core difference between a proximity switch and a limit switch lies in their triggering methods, the former senses the approach of an object and requires no contact, while the latter is activated by physical collision and pushing from an object, which means contact is a must. As a result, their applications focus on different automation scenarios.

Although both are used to "detect the position of an object and trigger a signal", their application scenarios are completely distinct due to the difference in triggering methods.

▪ Proximity Switch. It is suitable for non-contact, high-speed, and clean scenarios. Its core advantages are no wear and fast response, making it ideal for situations where objects are not supposed to be collided with or where objects move at high speeds.

▪ Limit Switch: It is applicable to contact, low-speed, and harsh scenarios. Its key strengths are durability and resistance to harsh environments, so it is suitable for situations where objects must be in place (requiring physical confirmation) or where the environment is dirty and messy.

How to choose between a proximity switch and a limit switch? The key criterion is to determine whether "contact" is allowed. If the object is vulnerable to collision (such as precision parts or the human body) or collision may affect accuracy, a proximity switch should be selected. If "physical confirmation of being in place" is required (such as equipment limiting or heavy-load scenarios), a limit switch is the right choice.

Applications of Proximity Switches and Limit Switches in TSTC Automatic Doors

Their main function is to monitor whether the door leaves are open, so as to control the operation of the automatic doors. The specific cases are as follows.

▪ TSTC 2 wing Revolving Door (Sliding Door + Revolving Door + Showcase) . A limit switch is installed in the top frame of the showcase to determine whether the showcase is locked or not. If the showcase is locked, the sliding door can operate normally, and if the showcase is not locked, the sliding door will stop running for safety reasons.

▪ TSTC Automatic Sliding Door with Panic Breakout System . A proximity switch is mounted on the top door frame to detect whether the sliding door leaf is pushed open. When the movable door leaf is pushed open, the proximity switch will be triggered, then the motor stops running, and the sliding door ceases to slide.

To more details, please contact our technical department .