| 摘要 |
PURPOSE:To make it possible to obtain a temperature regulator which is extremely safe and convenient, by making it raise an alarm in either case of an abnormal rise or fall of temperature. CONSTITUTION:The voltage which is set up in the output terminal of the positive side of a thermoelectric couple 10 is applied to the non-inverted input terminal of the differential amplification circuit 40. To the inverted input terminal of the circuit 40 is provided an output of the temperature setting circuit 30 which has been set with the switches 31-33. The output voltage V0 of the circuit 40 drives the output relay 43 through the voltage detection circuit 41, and simultaneously is applied to both the non-inverted input terminal of the comparison circuit 61 of the alarm circuit 50 and the inverted input terminal of the comparison circuit 71. Moreover, the voltage V1 of one end of the variable resistor 52 and the voltage V2 of the other end are applied to the inverted input terminal of the circuit 61 and the non-inverted input terminal of the circuit 71, respectively. And the voltage V0 is compared with the reference voltage V1 and V2 (V1>=V2) in the circuits 61 and 71, and in case of V0>V1 and V2>V0, the transistor 81 conducts and the alarm relay is operated. |
