Abstract
Humidity measurement is an important technique for the agricultural, foods, pharmaceuticals, and chemical industries. For the sake of convenience, electrical relative humidity (RH) sensors have been widely used. These sensors need to be calibrated to ensure their accuracy and the uncertainty measurement of these sensors has become a major concern. In this study, a self-made divided-flow generator was established to calibrate two types of electrical humidity sensors. The standard reference humidity was calculated from dew-point temperature and air dry-bulb temperature measured by a chilled mirror monitor. This divided-flow generator could produce consistent result of RH measurement results. The uncertainty of the reference standard increased with the increase of RH values. The combined uncertainty with the adequate calibration equations were ranged from 0.82% to 1.45% RH for resistive humidity sensors and 0.63% to 1.4% for capacitive humidity sensors, respectively. This self-made, divided-flow generator, and calibration method are cheap, time-saving, and easy to be used. Thus, the proposed approach can easily be applied in research laboratories.
Highlights
Humidity measurement is an important technique for various industries
The results indicated that a suitable calibration equation can decrease the uncertainty significantly
The consistency of the data distribution between the reading values of resistive and capacitive humidity sensors and standard reference values showed the usefulness of this divided-flow generator
Summary
Humidity measurement is an important technique for various industries. Humidity affects the air properties and materials that come into contact with air. The processes of manufacturing, storing, and testing are related to humidity [1]. Accurate humidity measurement is the key technology for preventing the condensation, corrosion and mold development, and for enhancing the safety of the food, pharmaceutical, and chemical industries. Humidity measurement contributes to how air-conditioners govern the thermal comfort of human beings [2]. Humidity levels affects the stomata openness of the leaves of plants, which controls the functions of evaporation and photosynthesis [3]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
