A line of sensors has been designed for protecting stamping and forming press dies. It includes broader-range proximity sensors; short- and long-range diffuse reflective sensors; a distance-settable optical triangulation sensor; and an ultra-long-range infrared through-beam sensor. Proximity sensors have four times the range of similarly sized inductive proximity sensors and can detect nonferrous metals, and long-range diffuse reflective sensors utilize infrared instead of visible light to minimize false actuations caused by oil mist in the sensing field. In addition, the ultra-long-range infrared through-beam sensor excels in lubrication-intensive environments, enabling reliable, repeatable operation.