The LiftMaster PRE-SENSOR Trailer Presence Sensor is a commercial accessory designed to detect when a truck or trailer is positioned at a loading dock door. By providing a presence signal to compatible door controls or safety systems, it helps facilities manage door operation, dock traffic lights, and interlocks to reduce door damage and improve workflow at warehouses, distribution centers, and manufacturing sites. As a replacement sensor or retrofit upgrade, it supports trailer detection use cases where operators need confirmation that a vehicle is at the dock before opening or moving a door.
Installed near the dock door opening and wired into an appropriate control input, the PRE-SENSOR supplies a status signal for traffic control or automation logic. It is intended for loading dock presence detection and does not serve as primary entrapment protection for a door; use with required photo-eyes and safety edges as specified by codes and the door operator manufacturer. For wiring, mounting location, and setup details, refer to LiftMaster documentation for your specific commercial door operator or dock control to verify compatibility and programming steps.