Control of conductive material evapn.

摘要

In a process for controlling evapn. of one or more conductive materials from one or more parallel-connected resistive evaporators, the novelty is that (a) the current (I), voltage (U) and/or power consumption (P) are continuously measured at least after the start of evapn.; (b) a rate of change (W), corresponding to dI/dt, dU/dt, dR/dt or dP/dt, is determined; and (c) evapn. is terminated by switching off the evaporator current source when the change rate (W) drops below a preset threshold value.