... you. A, Auto Initial Height Sensing(IHS)Torch Retaining Cap IHS and Proximity Switch IHS (NPN ... and PNP), Proximity Switch IHS is backup for Torch Retaining Cap IHS for cutting dirty/rusty workpiece, ... IHS has two speeds, adjustable to user, protect torch and better accuracy.B, Anti-Collision FunctionNo matter ... XPTHC-300, user no need to worry about torch head crashing.C, Freeze Auto Height Control on ...