Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Development of a Temperature Controller for Microwave-assisted Digestion System for Agricultural Samples

농식품 시료 전처리를 위한 마이크로웨이브 분해기용 온도 제어장치 개발

  • Mo, Chang-Yeon (National Academy of Agricultural Science, RDA) ;
  • Kim, Gi-Young (National Academy of Agricultural Science, RDA) ;
  • Kim, Hak-Jin (Department of Bio-Industrial Machinery Engineering, Pusan National University) ;
  • Kim, Yong-Hun (National Academy of Agricultural Science, RDA) ;
  • Yang, Kil-Mo (National Academy of Agricultural Science, RDA) ;
  • Lee, Kang-Jin (National Academy of Agricultural Science, RDA)
  • Published : 2009.10.25
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Abstract

Microwave digestion is a preferred pretreatment method for agricultural samples because of its quick chemical reaction and minimum loss of analytes. In this research, a feedback temperature controller was developed to control the temperature inside a vessel for the microwave-assisted digestion system. An existing industrial microwave oven was fitted with the temperature controller for controlling inside temperature of the vessel. Four control methods, On/Off, proportional (P), proportional integral (PI), and proportional integral derivative (PID) were used and compared. Experimental results showed that PID control produced best temperature control performance. The PID controller could maintain the temperature of water sample and rice sample in the digestion system with error range of $-2.5{\sim}3.3^{\circ}C$ and $-1.9{\sim}0.5^{\circ}C$ at set temperature of $170^{\circ}C$, respectively.

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References

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