Microcomputer-controlled Koji Incubation System and Its Application to Barley Koji Manufacture

마이크로컴퓨터 제어(制御) 종국배양장치(種麴培養裝置)와 보리코오지 제조(製造)의 자동화(自動化)

  • Kwon, Young-An (Department of Food Science and Technology, Seoul National University) ;
  • Chun, Jae-Kun (Department of Food Science and Technology, Seoul National University)
  • Published : 1988.06.01

Abstract

For the automation of Koji incubation process, microcomputer based Koji incubation system was built and applied to acquisition of the process variables, and to control of the Koji incubation process. The incubation variables included the relative humidity and Koji weight. And data measured were sent to the microcomputer by the interface device built with MC 6821 PIA. Incubation environment conditions -temperature and humidity- were controlled by the actuation of heater and mist sprayer with on/off signal generated by ASIC program. Aspergillus oryzae as a starter of the Koji and steamed barley as media were used and Koji was successfully manufactured both at $25^{\circ}C,\;70%$ RH and at $27^{\circ}C,\;80%$ RH. During the Koji preperation, the temperature was linearly increased and substrate was consumed stepwise showing 3 steps in the weight loss curve.

마이크로컴퓨터 코오지 배양시설을 제작하여 배양실내의 온도, 상대습도를 계측하고 코오지의 무게를 공정제어 대상으로 공정의 자동화를 시도하였다. 코오지 무게변화는 외팔보형 strain gauge 무게감응장치로 코오지 및 배양실의 온도는 백금저항선$(Pt,\;100\Omega)$ 센서로 계측하였다. 계측신호는 디지털화하여 MC6821 접속소자를 통해 마이크로컴퓨터로 입력되었다. 코오지 무게계측치를 공정의 제어대상으로 할 때 디지탈값(Y)과 코오지의 무게(W,g) 사이의 관계는 Y=0.310W+32.329(r=0.99989)이었다. 배양실내의 온도제어는 폐회로방식에 의하여 on/off로 이루어졌으며 습도제어는 계측된 건, 습구 온도값으로부터 계산된 습도값을 기준으로 살균수의 분무로 수행되었다.

Keywords