| 摘要 |
PURPOSE: To provide an improved type soundness indicator of a perishable product. CONSTITUTION: A first oscillator 11 to output the first clock signal which is hardly change by the temperature is included. A second oscillator 15 outputs the second clock signal to be changed, as the function of the temperature. A counter counts the pulse of the second clock with the time intervals to be determined by the first clock and outputs the count value. The data table 20 receives the count value and translates the count value to the time-temperature value, to express the relationship of the time and the temperature within the time interval, and outputs the time-temperature value to an adder 21. The adder 21 adds the time-temperature value to be outputted by the data table 20, and outputs the accumulated time-temperature value corresponding to the storage service life of a product. |
