... Series resonance circuit 2.One button operation 3.High efficiency,save energy 4.Has CE,SGS,country patents 1>Double frequency induction ... heating machine XS-80 technique data:1. type:XS-180-120B2. input voltage:three phase ... over-voltage, over current, lack of water, phase fail, over hot, etc. 8.Digital ... over-voltage, over-current,lack of water, phase fail,etc.3)auto frequency tracking, the ...