Patent ID: 9574927
Date: 2017-02-21
CPC Classifications: G01F,H01H

Claim:
1. A liquid level switch comprising: (a) a first elongated, non-electrically conductive substrate having a first and second pair of elongated electrical conductors thereon; (b) a second elongated non-electrically conductive substrate having first and second particular distinct electrical conductive areas thereon, completely electrically separated from each other, each electrically conductive area being positioned over an associated pair of electrical conductors positioned on the first elongated non-electrically conductive substrate for enabling electrical bridging contact between conductors of said pairs of electrical conductors; and (c) a substrate coupler for coupling said first and second non-electrically conductive substrates together face to face for providing separation of said non-electrically conductive substrates in the absence of hydrostatic pressure thereon, and for causing contact between said first and second non-electrically conductive substrates in the presence of hydrostatic pressure thereon for producing electrical bridging contact between conductors of the first and second pairs of conductors on the first non-electrically conductive substrate; wherein the electrically conductive areas of the second elongated non-electrically conductive substrate occupy portions of the length of said liquid level switch for producing particular liquid level output signals and wherein at least one of the first and second electrically conductive areas of the second elongated non-electrically conductive substrate occupy a portion of the length of said liquid level switch commensurable to particular liquid level output signal, wherein said electrically conductive areas are positioned along the length of the liquid level switch for producing output signals indicative of different fluid levels to be detected; and wherein a plurality of light emitting diodes are electrically coupled to said elongated electrical conductors for providing a visual representation of the present liquid level; and (d) an output circuit, coupled to the liquid level switch for applying a readout voltage to one of the conductors of the said pair of conductors for producing an output pulse on the other of the conductors of the said pair of conductors for indicating a particular detected liquid level, wherein said output pulse is produced across a round resistor that is amplified causing a self-latching relay actuating control of a desired component.