The oil bath heating element often burns out – is there an issue with the heating method?
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Hello, colleagues. Recently, the laboratory set up an open-type oil bath outside, with about 100 liters of oil in it and strong stirring. The heating temperature is kept constant at 180 degrees Celsius; the heating rod is placed inside a stainless steel sleeve, with heat being transferred to the sleeve through air radiation, which in turn heats the heat transfer oil. It’s roughly as shown in the figure. After using it for a while, two of the heating rods burned out. I’m not sure if it was caused by the heating element running idle in the air. Can some heat-conducting material be filled inside the heating sleeve to reduce the pressure on the heating rod? Such as quartz sand. Thank you to all the seniors. :lol
Another issue: the heat transfer oil used is Zite BD-1 320#, with a flash point of 200 degrees. In such an open oil bath setup, could an accident occur if the temperature rises above 200 degrees?
Is the distance between the heating rod and the protective cover too large?
Yes, the diameter of the protective case is quite large.