... .type:ED,DB,SC,SCR,UX,U,W 3.diameter:12~55mm 4.working temp:600~1600 deg.C 5.long ... gradually caused y the oxidation of element. When the voltage get to the up limit of the requirement, the furnace should be stopped, change the way of wire ... resistance value increases too much and cannot reach the furnace temperature, it is better to replace the heating elements with mew ones. Test and mark ...