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Usually, we see the readings reflected by the glass rod thermometer, which can be said to be the air temperature under ambient conditions at the time. Then, under vacuum, we see that there is also a reading on the glass rod thermometer placed in the vacuum chamber. Is it possible to say that this temperature is the temperature in the vacuum chamber? This is not acceptable. Because there is no air in the vacuum state, there is no air temperature at all in the vacuum chamber. The glass rod thermometer only feels the temperature due to the absorption of heat radiation. The amount of heat radiation absorbed is closely related to the roughness of the surface of the glass rod thermometer and the absorption, refraction and transmission properties of the material (infrared engineering term "blackness"). The closer the blackness of an object is to 1, the more radiant heat is absorbed and the higher the temperature of the object. On the contrary, it is low. At this time, the reading of the glass rod thermometer can only represent the temperature of the glass rod thermometer itself after absorbing the infrared radiant heat, and must not represent the actual temperature after the heat radiation is absorbed by the workpieces of different surface materials of different materials.
Therefore, when using the electric vacuum drying oven (under vacuum), please refer to the reading of the glass rod thermometer in the vacuum chamber and try to accumulate and summarize the operating experience to achieve the best results.
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