MEASUREMENT OF GAS CONTENT IN MOLTEN METAL USING A CONSTANT CURRENT SOURCE

摘要

A single catharometer cell is employed in combination with a source of DC voltage and a device that provides constant electrical current for the cell. The constant current source provides a fixed reference for balancing against the electrical current flow through the cell when the cell contains only a carrier gas. An operational amplifier is connected across the cell and is adjustable to provide a desired output when a known amount of a second gas is present in the cell.