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Temperature controller for fluid in an apparatus having a plurality of operation cycles

  • US 3,875,424 A
  • Filed: 08/27/1973
  • Issued: 04/01/1975
  • Est. Priority Date: 03/02/1972
  • Status: Expired due to Term
First Claim
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1. A control circuit for controlling the temperatUre of a fluid in an apparatus having a plurality of operation cycles comprising:

  • first circuit means comprises a separate signal circuit for each one of said operation cycles, each signal circuit having an output signal condition and producing a predetermined first signal representative of a desired fluid temperature during each one of said operation cycles when in said condition, no more than one of said signal circuits having an output signal condition at any given time, the other signal circuits having a normal signal condition, said first circuit means includes blocking circuit means responsive to the output signal condition of said one of the signal circuits to block the normal signal condition of the other signal circuits;

    second circuit means for producing a second signal representative of the actual fluid temperature and indicating said actual temperature during each one of said operation cycles; and

    third circuit means connected to said first and second circuit means and being responsive to the first and second signals for comparing the levels of said first and second signals during each one of said operation cycles and producing an actuating signal when the levels of said first and second signals have a predetermined relationship.

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