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Method of compensating a thermistor

  • US 4,416,153 A
  • Filed: 03/15/1982
  • Issued: 11/22/1983
  • Est. Priority Date: 03/15/1982
  • Status: Expired due to Fees
First Claim
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1. A system for controlling the level of liquid applied to a tank which is subjected to temperature variations, comprising:

  • first thermal sensor means adapted to be mounted within the tank at a predetermined threshold level for producing a first analog signal indicative of absolute temperature at the level;

    second thermal sensor means adapted to be attached to the tank for producing a second analog signal indicative of tank temperature;

    digital encoder means for converting said first and second analog signals to respective first and second digital data signals;

    digital storage means addressed by said second digital data signal and stored with discrete values of a voltage threshold function related to tank temperature for producing an appropriate threshold value upon the address of said second digital data signal; and

    a digital comparator connected to said encoder means and said storage means for signaling the discontinuance of liquid flow to the tank when the magnitude of said first digital data signal is equal to or greater than said threshold value.

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