The present invention relates, generally, to a method for electrowinning copper powder, and more particularly to a method for electrowinning copper powder from a copper-containing solution using the ferrousferric anode reaction. The accident sensor has at least one bore hole, which has a stud in an elastic sleeve as a fastening arrangement. The compression members may be moved in the longitudinal direction to adjust the degree of compressive force exerted on the portal seal member and thus adjust a diameter of the orifice to effectively interface with the instrument to form a fluid tight relation therewith. Additionally, use of the circuitry of the present invention reduces the cost and design limitations associated with stabilizing buses by solely using multiple low ESRESL capacitors.