1. Different uses The drying box is mainly used for drying and baking of articles. In addition to the function of the drying oven, the high temperature test chamber is mainly used for high temperature performance tests of bridge inspection, electrical, electronic and other non-inflammable and explosive materials. The artificial climate simulation system produced by our company provides intelligent environment simulation test system for durability performance of bridge engineering materials under various environmental conditions and different testing methods. 2. The main technical indicators are different The temperature uniformity of the drying oven is not more than ±2.5% of the maximum use temperature, and the temperature uniformity of the test chamber is not more than 2 °C (when the test temperature is 200 °C). Although it is only a sign of difference, the value is doubled. For 450 °C, the temperature of any two points in the drying oven can differ by 22.5 ° C, and the test chamber can not exceed 9 ° C 3. The difficulty of manufacturing is different On the surface, there is not much difference between the two. The practical difficulty is that when the air is heated to a temperature higher than 350 ° C, the movement of the gas becomes very difficult to control, even under the condition of forced blast, the flow of the gas is still disordered, so the design requirements for the air passage very high. The ducts should vary for different studio sizes. In order to obtain reasonable data, it is often necessary to go through repeated experiments. In order to achieve a higher uniformity index, the cost of manufacturing a test chamber is much greater than that of a dry box. 4. The control system is different Because the index is low, the dry box can be used with ordinary instruments. The test chamber must use a meter with high-precision PID calculation function, and sometimes it is necessary to specify the instrument to run the program for the purpose of testing. In use, the PID value of the high temperature section can be obtained by self-tuning, and sometimes the value obtained by the self-tuning needs to be modified by the operator.