Difference between drying oven and high temperature test chamber

1. Different uses

The drying box is mainly used for drying and drying the items. In addition to the function of a dry box, the high temperature test box is also mainly used for high temperature performance tests of electrical, electronic and other non-flammable and explosive items.

2. The main technical indicators are different

The temperature uniformity of the drying oven is not greater than Â± 2.5% of the maximum operating temperature, and the temperature uniformity of the test oven is not greater than 2 â„ƒ (when the test temperature is 200 â„ƒ). Although it is only a difference between signs, the values â€‹â€‹are doubled. As far as 450 Â° C is concerned, the temperature at any two points in the drying chamber can differ by 22.5 Â° C, while the test chamber cannot exceed 9 Â° C. See the technical index comparison table for details:

product name

temperature

Volatility

Temperature uniformity

Temperature deviation

Surface temperature â„ƒ

200 â„ƒ

300 â„ƒ

450 â„ƒ

Drying box

Â± 1 â„ƒ

Â± 5 â„ƒ

Â± 7.5 â„ƒ

Â± 11.25 â„ƒ

Does not require

Room temperature + 35 â„ƒ + ï¼ˆTmax-200ï¼‰ / 10

Test chamber

Â± 0.5 â„ƒ

2 â„ƒ

5 â„ƒ

9 â„ƒ

Â± 2 â„ƒ (200 â„ƒ)

50 â„ƒ (300 â„ƒ)

3. Difficulty in manufacturing

On the surface, there is not much difference between the two. The actual difficulty is that when the air is heated to a high temperature above 350 Â° C, the movement of the gas becomes very difficult to control. Even under the condition of forced blasting, the flow of gas is still turbulent, so the design requirements of the air duct very high. The air duct should vary for different studio sizes. In order to obtain reasonable data, it is often necessary to go through repeated experiments. In order to obtain a higher uniformity index, the cost of manufacturing the test box is much larger than the drying box.

4. The control system is different

Since the drying oven has a low index, it is sufficient to use an ordinary instrument. The test box must use the instrument with high-precision PID calculation function, and sometimes for the needs of the test, the instrument can also be specified to run the program. When in use, the PID value of the high temperature section can be obtained by auto-tuning, and sometimes the operator needs to make certain modifications to the value obtained by auto-tuning.

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