Portable closed chamber method for measuring water vapor transpiration.
● The closed chamber design allows for accurate measurements without being affected by external air turbulence or airflow. ● Measurement time is very short, ranging from 5 to 14 seconds. ● High-resolution A/D conversion enables accurate measurement of both trace and large amounts of evaporation. ● Response correction, forced stop time correction, moving average integration, and absolute humidity conversion processing allow for minimal error and accurate measurements. ● The high-performance CPU built into the main unit constantly monitors the temperature and humidity inside the chamber, displaying optimal measurement start conditions and automatically determining the best measurement time, ensuring consistently accurate measurement values. ● The most important humidity sensor employs the latest thin-film, high-sensitivity, fast-response type that remains stable over long periods, allowing for highly reliable measurements. ● Battery operation is also possible, enabling handheld measurements in various environments. ● The contact pressure between the probe and the skin can be light, allowing for measurements on small animals.
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basic information
■Measurement Principle By pressing the opening against the skin, a closed chamber state is created, and the humidity of the air inside the chamber increases according to the moisture evaporating from the skin surface at the opening. The amount of trans-epidermal water loss (TEWL) is calculated from the change in the rising absolute humidity. Additionally, since the response of the humidity sensor depends on relative humidity, response correction is performed by the built-in CPU, allowing for accurate quantitative measurement of TEWL in any environment.
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Moisture meter
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