What is the cause of the temperature difference in the low temperature test chamber? Then the Yashilin instrument technicians will analyze the cause of the uneven temperature in the low temperature test chamber.
First, insulation materials. Insulation material is the key point to ensure the uniformity in the low temperature test box. If the insulation material is not handled well, it will directly affect the uniformity deviation in the box. Generally, we use polyurethane insulation glass fiber.
Second, the wind circulation system. The test chamber adopts the air circulation for the uniformity in the low-temperature test box. For example, there is a duct on the back of the equipment. The heating tube heats the air and is evenly fed into the test chamber through the blades to reach a uniform temperature. The 60W high-temperature motor we use is used. Stainless steel multi-wing wind wheel, special adjustable one-page air circulation system.
Third, the seal of the box and the door. If the seal is not custom-made with seams, and if the high-low temperature test chamber leaks, it will greatly affect the uniform temperature inside the test chamber. Therefore, the seal of the test box has strict requirements and must have high temperature and low temperature. specialty.
Fourth, internal structural problems. For example, in the low-temperature test chamber, it is difficult to reach a uniform symmetrical structure in the internal structure and space planning, which affects the thermal convection in the room, resulting in an error in the internal temperature uniformity. Mainly due to the impact of sheet metal planning and sheet metal processing, such as the planning of the duct, the placement of the heating tube, the fan power, these details will affect the temperature uniformity inside the box.
5. The sample volume is too large. When testing, the test sample volume should not be too large. Generally, the test product should occupy 1/3 of the space. In addition, each product should not be densely packed to ensure the convection of the surrounding air and the middle air.
Sixth, the sample placement position is not reasonable. The sample can not block the air outlet, and must be separated from the air outlet by a certain distance. The test product should not be placed around the air duct, which seriously affects the circulation of the wind. The test sample should be stabilized to ensure that the wind wheel is placed in balance and the air is even.
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