Patent · US Expired

Material level indication

US5161411A · kind A · utility

10Cited by
9References
9Claims
0Family size

Assignee

Inventor

Key dates

Filing dateOct 2, 1991
Grant dateNov 10, 1992
Priority date—
Expiry dateOct 2, 2011

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01F23/802
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A system for indicating level of material that includes first and second probes disposed for operative coupling with material whose level is to be sensed. First and second electrical input circuits are respectively coupled to the probes and provide first and second signals. First and second electrical output circuits provide respective indications of material level by operating relay switches. A latch circuit has inputs that receive the respective first and second signals, and an output that changes state only when both first and second signals change state. The output circuits are selectively connected by jumpers either to the associated input circuit or to the latch output.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.