The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1987
Filed:
Sep. 03, 1986
James S Baughman, Stanwood, MI (US);
Walbro Corporation, Cass City, MI (US);
Abstract
A system for indicating level of material in a vessel as a function of material capacitance comprising a pair of parallel probe electrodes which extend through the vessel and have lower portions disposed beneath the vessel outlet in direct electrical contact with material whose level is to be measured. An electrical signal having both ac and dc components is fed to one of the electrodes, and detected at the other electrode, such that the detected ac signal component varies with both capacitance and conductance of material disposed between the electrodes while the dc signal component varies substantially as a function solely of material conductance. The dc signal component is used to compensate the ac signal component for variations in conductance, so that an output signal is provided which varies as a function of material level between the electrodes substantially independently of material conductance.