초록 ▼

A plurality of probes are situated as to experience being touched by the liquid being monitored; when at least one of such probes is touched by the liquid related electrical circuit means becomes energized as to cause related pumping means to be activated thereby pumping some of the monitored liquid

A plurality of probes are situated as to experience being touched by the liquid being monitored; when at least one of such probes is touched by the liquid related electrical circuit means becomes energized as to cause related pumping means to be activated thereby pumping some of the monitored liquid to, in turn, reduce the level of such monitored liquid; when the level of the monitored liquid decreases to a predetermined level, the pumping means is automatically de-activated; during periods wherein there might occur a momentary splashing or sloshing of the monitored liquid, time delay means serves to correspondingly delay activation of said pumping means thereby preventing unnecessary activation of the pumping means.

대표청구항 ▼

Liquid level sensing apparatus, comprising at least first and second electrical probe means, electrical logic circuit means operatively interconnecting said at least first and second electrical probe means, said electrical logic circuit means being effective for creating a first output of a first el

Liquid level sensing apparatus, comprising at least first and second electrical probe means, electrical logic circuit means operatively interconnecting said at least first and second electrical probe means, said electrical logic circuit means being effective for creating a first output of a first electrical magnitude when said liquid is at a predetermined elevation relative to said at least first and second electrical probe means as to be in contact with said first and second electrical probe means, said electrical logic circuit means being effective to continue creating said first output for a first predetermined span of time next following that instant at which said level of said liquid decreases from said predetermined elevation to a second elevation whereat said liquid ceases to contact both said first and second electrical probe means, said electrical logic circuit means being effective to prevent the creation of said first output of said first electrical magnitude by instead creating a second output of a second electrical magnitude for a second predetermined span of time next following that instant at which said liquid level moves from an elevation relatively lower than said predetermined elevation and attains said predetermined elevation, and output means effective for receiving said first and second outputs and producing a related response relative thereto.