... as follow, 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, ... 30V range. This Over Voltage protection can avoid torch diving on voltage spikes D. Set Pierce TimeSet ... XPTHC-100II, CHC-200DII, and XPTHC-III;2008 made capacitive CHC-300 for laser cutting;2009 ...