The PRV-10 series Hot Metal Detector (HMD) is an electronic controller that includes the infrared detection cell, amplifier and electronic outputs in an aluminum die-cast housing. To accommodate variation in product temperature and background radiation, three levels of infrared thresholds are selectable with an internal switch and sensitivity adjustment knob. Combined with flexible stainless steel fiber cables and interchangeable sensor heads, this radiant-heat detection system can be standardized throughout the mill.