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Gauge apparatus for measuring liquid levels

  • US 4,637,254 A
  • Filed: 10/10/1984
  • Issued: 01/20/1987
  • Est. Priority Date: 10/10/1984
  • Status: Expired due to Fees
First Claim
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1. Gauge apparatus for measuring liquid levels comprising a buoyant device adapted to float in the liquid being measured, said buoyant device including a body which has an annular portion and is formed of magnetic material, an immersible elongated sensor adapted to be arranged in upright position and having an electrical characteristic which may be varied, means connecting said buoyant device to said sensor for movement with respect thereto for varying said electrical characteristic in response to variations in elevation of said buoyant device caused by changes in level of the aforesaid liquid, said connecting means including force-generating means for holding said buoyant device in operative engagement with said sensor, said force-generating means including a permanently magnetized device that provides a concentrated magnetic field along a path that extends longitudinally of said sensor, said buoyant device and said magnetized device including means for maintaining said buoyant device in aligned registry with said path while said annular portion is in rolling engagement with said sensor, and means for measuring said electrical characteristic thereby to provide an indication of such level.

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