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TEMPERATURE CONTROLLER FOR CONTROLLING BOTH HEATING AND COOLING

  • US 3,826,305 A
  • Filed: 01/10/1973
  • Issued: 07/30/1974
  • Est. Priority Date: 01/10/1973
  • Status: Expired due to Term
First Claim
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1. A temperature controller for a process comprising:

  • means to maintain a measured temperature at a set point by controlling one of a pair of process inputs having opposite effects on said temperature, means responsive to a deviation between said measured temperature and said set point to produce an output from the controller operable to modify the magnitude of one of the inputs to the procees so as to tend to return said temperature to its set point, and means responsive only to the coincident occurrence of a magnitude for said one input below a preset value and a value for said deviation such that an increase in the other of said pair of inputs reduces the deviation, said last named means being operable to effect an increase in said other input to tend to reduce said deviation.

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