Abstract: The parts of a measuring sensor include an electrode mounted on a conductive body and insulated therefrom. Part of the electrical capacitance between the electrode and the body is determined by the dielectric constant and conductivity of the material in which the electrode and body are immersed. A screening band is provided along part of the length of the electrode so as to shield the electrode from the electrical effects of the material so that only selected levels of material will affect the capacitance.The sensor is ideal for use in enamelled steel vessels.

Abstract: A combination pH electrode uses an enameled steel structure. The reference electrode is replaceable and may be interchanged with a different type of electrode or a sealing plug.

Abstract: An enameled steel cone is the support for a heat sensitive resistor element. The resistive element is arranged upon the enameled base of the cone and with a layer of enamel. A hollow shaft extends from the apex of the cone. Wires connected to the resistive element are fed through the body of the cone and through the hollow shaft. The assembly may be enameled in place or otherwise secured to a prepared structure such as a enameled steel vessel or member.