The instrument reading of the electric air vacuum drying box is very different from the glass rod th

The instrument reading of the electric thermal vacuum drying box is very different from the thermometer thermometer reading in the vacuum chamber. Why is this?

Due to the various differentiated baffles of different users, as the manufacturer attempts to use a unified mode of radiant heat. The metering method is overwritten, not only technical have certain difficulties, but more importantly, the application surface is too narrow. Therefore, the price of the user can accept is starting point, and the general electric thermal vacuum drying tank is used to heat the vacuum chamber wall, and then radiate heating by the wall surface. In this manner, the temperature sensor of the controlled meter can be arranged in the outer wall of the vacuum. Sensor can simultaneously accept convection, conduction, and radiation heat. The glass rod thermometer in the vacuum chamber can only accept radiant heat, more because the glass rod black is not possible to reach 1 , a considerable part of the radiant heat is refracted, so the glass rod thermometer The temperature value reflects is definitely lower than the temperature reading of the instrument. Generally speaking, ° C When the working condition is temperature read , the number of readings of the glass rod temperature is different 30 ° C is normal.