The LiftMaster CPS3 Photo Eyes with Option Card are monitored safety sensors designed for commercial and industrial door operators. Installed on both sides of the door opening, these photoelectric eyes project an invisible infrared beam; if the beam is interrupted, the operator stops or reverses to help prevent entrapment. The included option card provides the proper interface for compatible LiftMaster logic boards that require a dedicated monitored input, making this kit a practical replacement or retrofit upgrade for sectional doors, rolling steel doors, and grilles where UL 325 compliant entrapment protection is required for features like Timer-to-Close or momentary-to-close operation.
Engineered for LiftMaster commercial operators, the CPS3 assembly is powered by the operator’s low-voltage accessory output (commonly 24V from the head unit) and is designed to work as a monitored photo eye, allowing the operator to detect faults such as misalignment or wiring issues. Typical installation places the sensors about 6 inches above the finished floor at each jamb; proper alignment and wiring to the designated terminals or to the included option card are required, followed by operator programming per the specific model’s manual. For best results and safety compliance, verify compatibility with your LiftMaster operator’s logic version and follow UL 325 testing procedures after installation. This kit is often specified by buyers searching for LiftMaster replacement safety sensors, monitored photo eyes, and retrofit options for commercial door operators.