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What is the general temperature of the surface of the constant temperature drying oven?

As a heating equipment, constant temperature drying oven is equipped with a heating wire in the lower part of its studio and a blower device in the left side, and the temperature table controls the constant temperature and high and low.
There is glass fiber as insulation material between the working chamber and the shell, the shell is made of steel plate, electrostatic spraying or oil spraying treatment on the surface of the oven, the working chamber is made of steel plate, galvanized plate and stainless steel plate respectively in three models, and there is an observation window made of tempered glass in the middle of the oven door. What is the general temperature of the surface of the constant temperature drying oven?
According to the national standard.
4.7.1 For the drying oven whose maximum working temperature is not greater than 200°C, the surface stability should not be greater than the indoor temperature plus +35°C on any surface 80mm and outside from the door frame of the oven, observation window, exhaust hole, motor shaft and so on.
4.7.2 The highest working temperature is greater than 200C drying oven, the limit of the surface temperature see formula
T1 = Tr + 35 + (Tm - 200) / 10
Many customers test the surface temperature practice is not standardized, resulting in the test temperature is too high. If you want accurate data, you need to follow the national standard approach to be strict.

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