Method of making liquid container having electrode plates to detect liquid level by measuring capacitance

摘要

Liquid level measuring capacitors, each having two vertically disposed generally polygonal plates, are made by preparing a provisional assembly including a first electrode plate having plural holes and a baffleplate shape. A second electrode plate opposite to the first electrode has plural holes corresponding to the first electrode plate holes. A one-piece dielectric spacer network inserted between the plates includes plural annular spacers arranged correspondingly to the holes of the plates. The spacer has zigzag connecting bars to breakably connect a number of the spacers to one another by relatively weak joints with a generally arc-like part of the outer periphery of each spacer. A fastener is inserted in the center hole of each spacer through aligned holes of plates. Each fastener is fixed to the plates. The end portions of the connecting bars are pulled to break and separate spacers. The separated connecting bar is separated from the provisional assembly, so the provisional assembly is converted into the electrode plate assembly and plural spacers remain sandwiched between the plates and are spaced from one another.