Ⅰ 引言 在許多生產過程和實驗室的試驗上,往往需要把某一熱過程的溫度維持不變,或使其按某一預定的次序而變化。為了達到這一目的,最好是自動地來調節溫度。隨着熱過程具體的要求和條件的不同,溫度自動調節有着各種方式。 雙位調節的構造最為簡單。在實驗室採用電熱的情况下,它最常用的。它宜於用在熱負載不大,而熱過程本身的熱容量很大的熱過 I. INTRODUCTION In many manufacturing processes and laboratory tests, it is often necessary to maintain the temperature of a thermal process unchanged or to change it in a predetermined sequence. In order to do this, it is best to adjust the temperature automatically. With the specific requirements of the thermal process and the different conditions, there are various ways to automatically adjust the temperature. Double adjustment of the most simple structure. In the case of electric heating in the laboratory, it is the most commonly used. It should be used in the thermal load is not large, and the thermal process itself, a large heat capacity overheating