Drexelbrook Controls, Inc.

Robert J Sun

Frederick L Maltby

An RF probe and method for making same including laminating sheets of thermoplastic insulation to both sides of a layer of wire screen which is evacuated and pressure thereafter applied by fluid pressure acting on a diaphragm pressing member.

Method of making an RF admittance measuring probe and product thereof

Various probes which are adapted to measure the liquid level in a vessel including the flow rate through a channel comprise a conductive probe electrode and guard electrode means including a rear portion located between the wall of the vessel and the probe electrode and a lateral portion extending outwardly from the lateral extremities of the probe electrode. The probe electrode and the guard electrode means are separated by interior solid insulation and an exterior solid insulation covers the probe so as to separate the guard electrode means and the probe electrode from the conductive liquid. By driving the guard electrode means at substantially the same potential as the probe electrode, the portion of a conductive coating which has accumulated at the lateral portions of the guard electrode means may be capacitively coupled to the potential of the guard electrode means thereby reducing the adverse effect of a conductive coating which has accumulated at the probe electrode.

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Bala Cynwyd, PA, United States of America

Robert J Sun