1,stand alone torch height control 2,suitable for all plasmas on market, including HD ... PNP), Proximity Switch IHS is backup for Torch Retaining Cap IHS for cutting dirty/rusty workpiece, needing the ... about torch head crashing.C, Freeze Auto Height Control on Corner SignalXPTHC-300 would freeze Auto Mode ... than Set Arc Voltage over 30V, THC Auto Control Mode freezes to avoid torch head diving, until ...