Background evaluation photoelectric sensors establish a light path to a reference background object and back to the sensor. Targets are detected when they pass in front of the sensor and disrupt the light path. Even rounded or curved targets that otherwise may reflect light away from the sensor and targets with poor reflectivity can be detected.
Dura-Vue sensors feature a harsh-duty IP67-rated, metal-framed housing with swivel connector and operate in temperatures as low as -40 °F. The sensor automatically sinks, or sources, its current based on the connected load. A visible red light source allows for precise alignment, while a potentiometer facilitates adjustments to sensing range.