This means that the air is extremely dry and contains almost no water molecules. WHAT DOES LOW DEW POINT MEASUREMENT MEAN?Ī low dew point is usually when the dew point temperature falls below -30 ☌ Td. In this connection, the term pressure dew point measurement is also used to describe measurement of the dew point in gases above the ambient temperature.
If air is compressed, it is able to absorb less water and the dew point rises until the air is saturated and begins to condense. If air is compressed or expanded, its dew point temperature changes. The dew point temperature is a measurement of the water vapor content in a gas.
Published by AIP Publishing.As the term implies, it is the climate point at which the relative air humidity equals 100% and begins to condense. Wang, “ Fast quartz resonant sensors for high humidity range 60%–95% RH,” Sens. Hillman, “ The EQCM: Electrogravimetry with a light touch,” J. HYSYS Manual, Hyprotech, Ltd., Calgary, Canada, 1998. Rahimpour, “ Prediction of CO 2 solubility in ionic liquids with QM and UNIQUAC models original,” J. Prausnitz, “ Statistical thermodynamics of liquid mixtures: A new expression for the excess Gibbs energy of partly or completely miscible systems,” AIChE J. Oyabu, “ A smart gas sensor using polymer-film-coated quartz resonator microbalance,” Sens. Choi, “ Fabrication and application of an activated carbon-coated quartz crystal sensor,” Sens. Choi, “ Accurate dew-point measurement over a wide temperature range using a quartz crystal microbalance dew-point sensor,” Meas. Gordon, “ Frequency of a quartz microbalance in contact with liquid,” Anal. Sauerbrey, “ Verwendung von Schwingquarzen zur Wagung dünner Schichten und zur Mikrowagung,” Z. Velasco, “ Dew points of quaternary methane + carbon dioxide + water + methanol mixtures. Measurement and modelling,” Fluid Phase Equilib. Velasco, “ Dew points of binary carbon dioxide + water and ternary carbon dioxide + water + methanol mixtures. Jachowicz, “ A new method of super-cooled water recognition in dew point hygrometer by morphology-based image processing,” Sens. Su, “ The application of CNT/Nafion composite material to low humidity sensing measurement,” Sens. Paczesny, “ Fast dew point hygrometer with silicon integrated detector-optimization of dynamic properties,” Sens. Prasad, “ Boiling temperature measurements on the binary mixtures formed by dimethyl carbonate with some chloroethanes and chloroethylenes at 95.8 kPa,” Fluid Phase Equilib. Saito, “ Measurement of bubble point pressure for CO 2 + decane and CO 2 + lubricating oil,” Fluid Phase Equilib. Furter, “ Thermodynamics of moist air: Contribution to error estimates,” Appl. Hu, “ Vapor–liquid equilibria for mixed solvents–polymer systems, measurement and correlation,” Fluid Phase Equilib. Kawai, “ Vapor–liquid equilibria determination for a hydrofluoroether with several alcohols,” Fluid Phase Equilib. Zhao, “ Measurement of vapor–liquid equilibrium for binary mixtures of phenol–dimethyl carbonate and phenol–methanol at 101.3 kPa,” Fluid Phase Equilib. Though the maximum deviations of the sensor are less than 1.1 ☌, it still has a fast response time with a recovery time of less than 10 s, providing an excellent dehumidifying performance. The results were compared with the dew points predicted from the universal quasi-chemical equation to evaluate the performance of the proposed sensor. Its performance was evaluated with acetone–methanol mixtures under different pressures. This method exploits the high sensitivity of the quartz crystal but without frequency measurement and also retains the stability of the resonant circuit. Such a phenomenon can be used to detect the dew point. The cessation of oscillation was measured because this phenomenon is caused by dew condensation.
Proactive approach is taken to produce condensation on the surface of the quartz crystal, and it will lead to a change in electrical features of the quartz crystal. The sensor consists of the quartz crystal and a cooler device. A fast dew point sensor has been developed for organic vapor mixtures by using the quartz crystal with sensitive circuits.