THC SENSOR CARD     The THC Sensor card is installed adjacent to the plasma unit and provides the interface for the Torch Switch, scaling, and filtering of the Tip Voltage.   Also included (not shown) is the Current Sense Transformer designed for plasma machines that do not have an Arc Good (XFR) active signal. Circuitry is provided to adjust the sensitivity of the Arc Sensing and a front panel lamp indicates the Arc Good condition. Interface connection to the controller is with a standard DB9 shielded cable. An can be up to 25 ft in length. Included as part of the MP1000-THC package.  Optional plastic case (undrilled) is available for mounting external (but close to) to the plasma unit. NOTE: Picture is of REV 6 card.  May vary slightly on later models.