With the upgrade of technology, high and low temperature test chambers play an extremely important role in fields such as electronics, automobiles, household appliances, electronic components, LEDs, coatings, and communications. By placing a certain type of product or material in various temperature and humidity environments, the humidity and dryness resistance of the product or material can be tested, which is a type of product adaptability test.
The smooth operation of the high and low temperature test chamber's temperature control system mainly relies on the cooperation of the circulating air fan system and the condenser fan and other equipment. During testing, if the ambient temperature is higher than the test product temperature, the water vapor produced by the temperature rise will condense into droplets, which is commonly known as condensation. When the test reaches the stage of alternating damp-heat and cooling, the temperature drop of the internal wall of the sealed shell is faster than that inside the shell, which can also cause condensation.
When we use high and low temperature test chambers for testing and condensation occurs on the testing equipment or test products, how should we deal with it?
During testing, the humidity inside the box can be reduced by drying the evaporator and air duct inside the box with high temperature and then replacing the internal air with dry air. Insulating materials can also be placed at the bottom of the equipment to isolate the bottom of the box from the internal equipment to reduce the formation of moisture. A dehumidifier can also be used to achieve low humidity control according to the ambient conditions.
During testing, cold air can be introduced into the high and low temperature test chamber and the humid air can be replaced, which is also a "dehumidification" method and is a more common humidity control method and one way to solve condensation. Additionally, some hydrophilic substances such as activated carbon or desiccants can be placed inside the box to absorb moisture.
After testing, condensation on the surface of the tested product can be greatly reduced by lowering the temperature rise speed, compressing the temperature difference between the test product and the internal air of the high and low temperature test chamber.
Changes in temperature and humidity in the test environment are highly likely to cause condensation in the high and low temperature test chamber. It should be noted that whether condensation occurs on the surface of the product or inside the box, it can cause damage to the test product. Therefore, we need to check the equipment frequently and deal with condensation in a timely manner to avoid greater losses.