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Multiple set point condition monitoring systems

  • US 4,799,174 A
  • Filed: 10/23/1987
  • Issued: 01/17/1989
  • Est. Priority Date: 03/13/1986
  • Status: Expired due to Term
First Claim
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1. A system for monitoring a specified condition of materials at multiple set points comprising:

  • comparison means having a pair of inputs;

    material sensing means comprising a single admittance probe coupled to one of the inputs of the comparison means for providing an admittance indicative of the condition of the materials;

    sequential admittance generator means coupled to the other input of the comparison means for automatically and repeatedly providing a plurality of different admittance values, each admittance value corresponding to a different set point;

    detector means coupled to the comparison means for detecting a difference between the admittance provided by the material sensing means and each of the admittances provided by the sequential admittance generator and providing an output indicative thereof;

    storage means coupled to the detector means for storing indications of differences detected by the comparison means for each admittance value provided by the sequential admittance generator means;

    output means coupled to the storage means for providing a plurality of output signals, each output signal corresponding to at least one of the indications stored by the storage means;

    whereby each output signal represents a relationship between at least one of the multiple set points and the condition of the materials indicated by the material sensing means.

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