The LiftMaster 50-15515 IR Detector is an infrared photoelectric receiver used as part of a through-beam safety sensor pair for LiftMaster gate and barrier operators. As the receiving side of the beam, it detects interruptions to help provide entrapment protection and comply with modern safety practices for automated swing gates, slide gates, and barrier arm systems. This replacement IR detector restores reliable photo eye functionality when the original receiver is damaged or fails, helping keep residential and commercial access control systems operating safely and in line with UL 325 safety requirements when used with compatible monitored controls.
For proper operation, the 50-15515 must be paired with the matching LiftMaster infrared transmitter (sold separately) and mounted directly across the driveway or opening at the same height. After mounting, align the beam and wire the detector to the operator’s designated safety input following the instructions in the gate operator manual. Installation should be completed by a qualified technician, and the photo eye should be tested after setup and as part of regular maintenance to verify beam alignment and correct reversal/stop response. Compatibility, wiring, and any programming steps vary by operator model; consult the specific LiftMaster operator documentation to confirm supported safety inputs and connection details.