Liftmaster LMTBUL Through Beam Photo Eye Monitor

Product Description

The LIFTMASTER LMTBUL is a through beam photo eye monitor designed for use in commercial and residential gate and door access control systems. Through beam photo eyes operate by projecting an infrared beam between a transmitter and receiver mounted on opposite sides of an opening. When an obstruction breaks the beam, the system responds to prevent the gate or door from closing. The LMTBUL monitors this beam status and integrates with compatible access control operators to provide reliable obstruction detection and safety compliance.

This unit is suited for installation on swing gates, slide gates, and overhead door applications where a dedicated photo eye monitoring circuit is required. It is commonly installed by gate system technicians, licensed electricians, and access control professionals in parking facilities, commercial properties, and secured entryways. The accessory format allows it to be added to existing operator setups where enhanced safety monitoring is needed.

Key Features

• Through beam infrared detection for reliable obstruction sensing across a door or gate opening
• Monitor function integrates photo eye status with the gate or door operator control circuit
• Sold as a single unit for direct replacement or new installation
• Designed as an OEM accessory for LIFTMASTER access control and gate operator systems

Compatibility

Designed as an OEM-style accessory for LIFTMASTER gate operators and door control systems requiring through beam photo eye monitoring. Refer to the operator installation manual to confirm compatibility with your specific system configuration.

Installation Notes

Installation should be performed by a qualified gate system technician or licensed electrician familiar with access control wiring and applicable local codes. Disconnect and lock out power to the gate or door operator before beginning installation or wiring of the photo eye components. Mount the transmitter and receiver on opposing sides of the opening at the appropriate height for the application, ensuring the beam path is unobstructed during setup. Consult the LIFTMASTER operator documentation for low-voltage wiring termination points and safety loop configuration requirements.