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Analog pulsed heat trace monitor or the like

  • US 4,751,495 A
  • Filed: 01/28/1986
  • Issued: 06/14/1988
  • Est. Priority Date: 01/28/1986
  • Status: Expired due to Term
First Claim
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1. A monitored heating system which comprises:

  • (1) an AC power source(2) an elongate heater comprising two elongate electrodes which are connected to the power source, and a plurality of resistive heating elements connected in parallel with each other between the electrodes;

    (3) a temperature-sensing means for sensing the temperature of a substrate heated by the heater at a first location;

    (4) a signal generator which(a) is associated with the temperature-sensing means,(b) is powered, through the electrodes, by the AC power source;

    (c) generates a pulsed DC signal having a pulse rate which is proportional to the temperature sensed by the temperature-sensing means, and(d) is coupled to the heater so that the pulsed signal is transmitted down one of the electrodes; and

    (5) a receiver which is coupled to the heater at a second location and which produces a response which is dependent on the pulse rate of the pulsed signal.

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