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智能馬弗爐的結構組成和工作原理

发布时间：2013-08-08 点击次数：1651次

智能馬弗爐的結構組成和工作原理

智能馬弗爐又稱爲高溫一體電爐，常用于定量分析中灼燒沈澱，測定灰分和熔融試樣等。常用溫度爲600-950℃，最高使用溫度爲l000℃，但使用時間不能太長。智能馬弗爐加熱室用耐火材料及二氧化矽、氧化鎂、氧化鋁等制成，電熱絲爲鎳鉻合金絲。智能馬弗爐爐外部由鐵板制成，塗以耐腐蝕漆。爐內的升溫情況可通過爐門上嵌留的透明雲母片觀察。當爐膛內暗紅色時，約600℃左右，達深桃紅色時約800℃左右，若呈淺桃紅色約l000℃左右。
智能马弗炉的自动定温控制器是由一块毫伏表和一个继电器组成，连接一支相匹配的热电偶。热电偶装在一根耐高温的瓷管中，并从炉的后部中间小孔伸入炉膛内。热电偶随着炉温不同产生不同的电势，电势的大小直接用温度数值在控制器表头上显示出来。当指示温度的指针(上指针)缓慢上升与事先调好的控制温度指针(下指针)相遇时．继电器立即切断电路，停止加热。当温度下降，上下指针分开时继电器又使电路重新接通，电炉又继续加热，如此反复动作，就可以达到自动控温的目的。一般在灼烧前。将控温指针拨到顶定温度的位置，从到达预定温度时计算控温时间。

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