Thaw depth Thaw depth In soil science, the thaw depth or thaw line is the instantaneous level down to which the soil has warmed to zero degrees celcius. The active layer thickness is the maximum thaw depth over a period of two years. The layer of soil over the thaw depth is called the active layer, while the soil below is called permafrost. The term frost front refers to the varying position of the thaw line during the periods of freezing/thawing. The knowledge of the thaw depth is important for the two major reasons: its influence on the ecology and on construction
Zero speed switch applications, zero speed switch suppliers can provide zero speed switches that are explosion proof, weather proof or dust proof. There are two types of ZSS, based on power supply provision. One is the interrupted power type, in which the power supply is given to the ZSS only for the duration for which the power is going to the motor of that machine. In the second type, the power supply is continuously given to the ZSS. Installation of the zero speed switches depends on the shaft or rotating part construction, where the speed has to be monitored. Zero speed switch Zero