PURPOSE:To simplify the constitution by converting the output signal of a thermocouple for every channel into a digital value, converting the digital value into the temperature data, comparing the value with a preset value, and recording the value based on the result of comparison. CONSTITUTION:The output signals of thermocouples which are inputted through input terminals in input units 7 - 10 are converted into the digital signal through input parts 2 and A/D converters 3. The signals are further converted into the temperature data. The data are imparted into a memory 4 and a comparator 33. In a CPU 11, a preset temperature K from a temperature setting device 27 is read through an input part 28 and imparted into a latch 32. In the comparator 33, the signal from a converter 31 and the temperature K are compared. The result is sent into a gate 34. The output of the gate 34 is interrupted into the CPU 11. When the signal from the converter 31 is smaller than the temperature K, the interruption does not occur in the CPU 11. On the contrary, when the signal becomes larger, the output of the comparator 33 is interrupted into the CPU 11 through the gate 34. The CPU 11 controls output parts 20 and 21, and the data are recorded on recording paper 22.
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