| 摘要 |
PURPOSE:To simply wire connection for a total device through reduction in the number of wires for connecting together temperature setters, by mounting variable constant-current circuits, applying a required current to a temperature sensitive element in the temperature setters. CONSTITUTION:Variable constant-current circuits 23 and 24 are mounted to the inside of a first temperature setter 11 and a second temperature setter 14. A temperature-sensitive element 5, connected in series selectively to each of the temperature setters 11 and 14 according to temperature of a substance to be heated, is related to a bridge circuit consisting of a resistance elements 15 and 16, and the temperature of the substance to be heated is set by changing the current value of said variable constant-current circuit 23. |
