In the high-low temperature alternating humidity test and the cyclic damp heat test, the dry-wet bulb method is commonly used to measure humidity. This technique, developed in the 18th century, has a long history and remains widely applied today. However, it's an indirect method that calculates humidity based on the difference between the dry bulb and wet bulb temperatures using the dry-wet bulb equation. For accurate results in high-low temperature alternating humidity chambers, the air velocity near the wet bulb must exceed 2.5 m/s. Standard dry-wet bulb thermometers usually simplify this condition, which limits their accuracy to about 5–7% RH.
It's important to note that the dry-wet bulb method isn't static or foolproof. Simply improving the accuracy of the two thermometers doesn't guarantee better humidity readings. The measurement process involves several factors, including airflow, evaporation rates, and environmental conditions, which all influence the final result.
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Whether you're conducting humidity tests, thermal cycling, or other environmental stress evaluations, Yashilin Instruments offers advanced tools to ensure precision and consistency in your testing procedures. With years of experience and a strong focus on quality, we are here to support your testing requirements with confidence and expertise.
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