PURPOSE: To facilitate the control of deodorizing and to detect a decrease in the freshness of food in a refrigerator by obtaining the degree of offensive odor in such a manner that odor concentration is low when a decrease in the output of a gas sensor is large upon operation of an deodorizer, and it is high when the decrease is, on the contrary, small.
CONSTITUTION: A deodorizer 18 is operated for a period t2 of time of approx. 10 min-1 hour, and the reduction rate X of the output of a sensor 2 during this period is obtained. The rate X of the output of the sensor 2 due to the operation of the deodorizer 18 represents the degree of offensive odor, the larger the X is, the lower the odor concentration, and vice versa. When the rate X of the output of the sensor due to the offensive odor becomes an allowable value α or less, it is observed that the freshness of food in a refrigerator is lowered, it is displayed by a light emitting diode 24 to display the process of the food before it is putrefied.
YASUNAGA SUSUMU
ONO YASUNORI
YOKOE AKIRA
TAKI KATSUHIKO
MATSUSHITA REFRIGERATION