How to detect the air permeability of Vents?

1. Cup method
Prepare a permeable cup with desiccant and seal the Vents on the cup mouth.
Put the permeable cup in a constant temperature and humidity environment. After a certain period of time, measure the amount of water vapor absorbed by the desiccant to calculate the water vapor permeability of the membrane.
2. Weight method
Install the Vents on a specific test device to form a closed cavity.
One side maintains high humidity and the other side maintains low humidity. The air permeability is calculated by measuring the weight change caused by water vapor passing through the membrane within a certain period of time.
3. Sensor method
Use a high-precision humidity sensor to measure the amount of water vapor passing through the Vents.
In the test device, sensors are installed on both sides of the membrane to monitor humidity changes in real time to obtain air permeability data.
4. Infrared detection method
Use the absorption characteristics of infrared rays on water vapor to detect the amount of water vapor passing through the membrane.
This method usually has high detection accuracy and speed.