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Analysis of the cause of excessive uniformity

When selecting the high and low temperature test chamber, the user can refer to the technical parameters of the equipment such as temperature range, uniformity, fluctuation, heating rate and cooling rate to match the test conditions to be achieved. Uniformity is a parameter that we need to pay attention to. In the process of using the device, there will always be a fault with too much uniformity. Now Hongzhan Technology Co., Ltd. analyzes the four major reasons for the high uniformity of high and low temperature test chambers:

1, poor sealing

The sealing performance of the cabinet is not good. For example, if the door leaks, it will affect the temperature of the equipment studio.

2, the sample size is too large

If the temperature deviation is required to place the sample in the working chamber, if the sample volume is too large, or the placement or position is not appropriate, the air convection is blocked, which may cause a large temperature deviation.

3. Uneven heat transfer in the tank wall

Due to the heat conduction of the high and low temperature test box wall, heat loss occurs in the high temperature box or the low temperature box leaks. In order to compensate for the heat loss, there is a difference in the supply air temperature. The air supply temperature of the high temperature box is higher than the working temperature inside the box. The supply air temperature of the box is lower than the working temperature inside the box. Due to the inevitable temperature difference of the supply air, temperature unevenness is generated in the working chamber.

4, structural asymmetry

The structure of the high and low temperature test chamber equipment largely affects the uniform temperature in the working medium. Since the structure is difficult to be completely symmetrical, it has an adverse effect on temperature uniformity. The front door is in front, the air-conditioned room is at the back of the box, and the wind is sent back to the wind. This structure has good left-right symmetry and can easily reach the left and right temperature uniformity.