CX-502's dual pattern lens can be set to rotate for either a 50'x50' wide angle coverage pattern or a 80'x6' curtain pattern (with look down zones). CX-502 protects large areas with high quality detection and is specially built for 'heavy-duty' commercial and institutional environments. Features included with this device are a spherical lens design, temperature compensation circuitry, and Double Conductive Shielding of the sensor element. CX-502AM uses two photoelectric beams to sense masking attempts and turn on a different masking/trouble relay.