Even with a waterproof structure, the internal temperature can drop by just a few degrees, leading to high humidity and condensation. Are you using it beyond the specified humidity range of the product?
I never imagined that the cause of the malfunction would be "humidity"! The product has a waterproof structure with a specified humidity range of 20% to 80%. During daytime inspections, the internal temperature was 25°C and the humidity was 60%, which is an acceptable environment. However, it malfunctioned later. Upon investigating the cause, I found that the humidity inside had risen at night! Why?
At a temperature of 25°C and humidity of 60%, the dew point temperature at which condensation begins is 16°C. Just a few degrees drop in temperature can lead to high humidity and condensation.
(Relative) humidity % = Actual amount of water vapor in the air / Amount of water vapor that can be held in the air (saturated water vapor amount) x 100. The saturated water vapor amount in the denominator decreases as the temperature drops and increases as the temperature rises.
Therefore, even if the amount of water vapor in the air does not change, if the temperature drops, the humidity will rise. Conversely, if the temperature rises, the humidity will drop, making it a phenomenon that is not easily noticed.
The humidity inside the product fluctuates between medium to high humidity levels, potentially exceeding the specified humidity range of the product. Without knowing this situation, damage can occur, leading to sudden malfunctions (such as poor contact, power loss, decreased insulation resistance, etc.) one day. Especially in infrastructure facilities, a malfunction of just one piece of equipment cannot be overlooked. Problems can arise whether the humidity is too high or too low.
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