The LiftMaster CPS-OPEN4 is a monitored dual-sided photoelectric safety sensor set engineered for commercial and industrial door applications. Designed to work with LiftMaster commercial door operators that support monitored entrapment protection, it provides UL 325–compliant obstruction detection across the door opening to help prevent unintended movement when an object or person interrupts the beam. Its NEMA 4X-rated housing is built for harsh, wet, or corrosive environments, making it a strong choice for warehouses, loading docks, parking facilities, agriculture operations, and car wash installations. As a replacement part or upgrade, these dual-sided photo eyes deliver reliable, continuously monitored safety performance for rolling steel and sectional overhead doors.
The CPS-OPEN4 installs on both sides of the opening with the beams aligned near the floor plane (commonly mounted low to meet UL 325 guidelines) and connects to the operator’s monitored entrapment input for continuous self-checking of wiring and sensor status. The NEMA 4X construction helps protect against water ingress and corrosion, supporting long-term durability indoors or outdoors. For best results and compliance, pair the CPS-OPEN4 with compatible LiftMaster Logic-based commercial operators that require monitored photo eyes, follow the operator and sensor manuals for wiring and alignment, and perform routine obstruction testing after installation and during maintenance intervals. Keywords: LiftMaster CPS-OPEN4 monitored photo eyes, NEMA 4X safety sensor, commercial door operator accessory, dual-sided photo eye replacement, UL 325 entrapment protection, rolling steel and sectional door upgrade.
