×

Material level indicator

  • US 5,142,909 A
  • Filed: 08/14/1987
  • Issued: 09/01/1992
  • Est. Priority Date: 09/29/1986
  • Status: Expired due to Fees
First Claim
Patent Images

1. A system for indicating level of material in a vessel comprising:

  • resistance probe means including a plurality of electrically discrete resistor probes of electrically conductive construction positioned within the vessel in a spaced array extending height-wise of the vessel, said probes being characterized by having electrical resistances which vary as a function of heat dissipative coupling with material in the vessel,said resistance probe means comprising a continuous layer of resistance material on a planar rectangular substrate, said resistance layer being of serpentine contour height-wise of the vessel, and first and second opposed electrical contact means positioned in alternate undulations of said resistive layer height-wise of the vessel, said resistance layer and said contact means being carried on one face of said substrate,said first contact means comprising a first array of contacts extending from one edge of said substrate and being interconnected by an electrical bus which extends along said edge, said second contact means comprising discrete second contacts extending from an opposing edge of said substrate,first circuit means individually connected to said discrete probes and being responsive to variation of said electrical characteristics, andsecond circuit means coupled to said first circuit means and responsive to total variation of said electrical characteristics collectively at said probes for indicating level of material in the vessel adjacent to said probes.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×