A heatingelement is designed using resistanceheating silk and printed board, and an instrument of temperature measurement and control is designed using transistor as the temperature sensor.
The heatingelement is screwed up by high resistance alloy wires and installed on the hearth's two sides, the rear wall of the furnace bottom and the furnace door.
加热元件的由高电阻合金丝绕制成螺旋状，安置在炉膛二侧，炉底后墙及炉门上。
3
If the heading element is much damaged or its resistance value increases too much and cannot reach the furnace temperature, it is better to replace the heating elements with mew ones.