Hot metal detectors hmd are built for tracking hot products at the different stages of the hot rolling process. In critical operation such as for the control of the shear head/tail crop, Or cut to length it ivital for rely on accurate sensors which will detect in under 1 ms the upper section size or, And tail independently of, Thermal state the position of the bar. For these applications, Scanning hmd are recommended owing to their narrow lateral field. The implementation of the newest advancements in technology of infrared detector allows the detection of products down to 180 c, For detection after water quenching.