How to choose the gauze of constant temperature and humidity test chamber

The humidity test chamber may display 100% relative humidity, which is typically caused by improper placement of the wet gauze. It could also be due to the use of incorrect gauze that doesn't meet the required specifications. The wet bulb gauze used in these devices is not just any fabric—it must be a specific type designed for this purpose. Let's take a closer look at what makes the right gauze so important. In a constant temperature and humidity test chamber, the placement of the wet bulb gauze is strictly regulated. The gauze should be 100 mm long and tightly wrapped around the sensor probe. The probe needs to be positioned 25–30 mm away from the humidity cup, and the gauze should be fully immersed in the water reservoir. This setup ensures accurate humidity readings. According to the standards, only specially manufactured "wet bulb gauze" made from linen can be used. Using other materials may lead to inaccurate readings, which can compromise the reliability of the entire testing process. The relative humidity measurement in the test chamber depends on the difference between the dry bulb and wet bulb temperatures. This reading is also influenced by local atmospheric pressure and air movement at the time of measurement. Therefore, maintaining proper conditions is essential for accurate results. The wet bulb temperature reading is directly affected by how much water the gauze absorbs and how quickly it evaporates. These factors are highly dependent on the quality of the gauze. Choosing the right material ensures that the device functions as intended and provides reliable data. Understanding these details helps users avoid common mistakes and maintain the accuracy of their equipment. A high-quality gauze not only improves performance but also ensures that the device operates at its full potential.

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