Patent ID: 9140661
Filing Date: 2015-09-22
Classification: G01N

Abstract:
1. An apparatus for making measurements in a Liquid Metal Cleanliness Analyzer (LiMCA), having a body of molten metal containing particles, an electrically insulating unit having a passage formed therein for passage of the molten metal, the apparatus comprising: a first electrode positioned on one side of the electrically insulating unit; at least one additional electrode inserted in the molten metal on an opposite side of the electrically insulating unit to the first electrode; at least one voltage control resistor associated with the at least one additional electrode; a voltage recording device connected between the first electrode and the at least one additional electrode; and a current source configured to supply current at an initial predetermined level to the first electrode and to the at least one additional electrode to create a current loop between the at least one additional electrode and the first electrode, the current loop generating a wanted pulse signal that is recorded by the voltage recording device, wherein the apparatus is configured to adjust the at least one voltage control resistor associated with the at least one additional electrode to re-adjust the current output to the predetermined level during the course of one measurement while the voltage recording device is temporarily prevented from recording the wanted pulse signal, thereby maintaining the supply of current at the predetermined level for a period of time required for the one measurement.