There are as many as two or thirty kinds of humidity measurement reasons. But humidity measurement has always been one of the well-known problems in the field of social measurement. A seemingly complicated quantity, when it is studied in depth, touches on the quite complicated physical-chemical analysis and calculation, the newcomer can neglect the many factors that must be paid attention to in the humidity measurement, so the rational use of the sensor is undermined. The methods of measuring humidity that are rare in high and low temperature test chambers are: static method (double pressure method, double temperature method, shunt method), static method (saturated salt method, sulfuric acid method), dew point method, dry and wet bulb method and electronic sensor law. Because of the use of ancient measurement and control wrists, these devices can be made quite elaborate, but because of the cumbersome, expensive, and time-consuming operation of the equipment, they are important for standard measurement, and their measurement accuracy can reach more than ± 2% RH. The double pressure method and the double temperature method are based on thermodynamic P, V, and T balance reasons, and the balance time is longer. The split flow method is based on the accurate mixing of relative humidity and relatively dry air. The dew point method is to measure the temperature when the humid air reaches saturation, which is an indirect consequence of thermodynamics, with high accuracy and wide measurement range. The precision of the dew point meter used for measurement can reach ± ​​0.2 ℃ or even higher. Electronic humidity sensor products and humidity measurement belong to the declining industry in the 1990s. In recent years, the international research and development of internal humidity sensors has greatly improved. The wet and dry bulb method is the most common measurement method and a direct method. It uses the wet and dry bulb equation to calculate the humidity value, and this equation is conditional: that is, the wind speed near the wet bulb must reach 2.5m / s or more. Commonly used dry and wet bulb thermometers simplify this condition, so its accuracy is only 5 ~ 7% RH, and the dry and wet bulbs are not static methods. Do n’t be complicated. Just increase the measurement accuracy of two thermometers is equal to progress The measurement accuracy of the hygrometer. The saturated salt method in the static method is the most rare method in the humidity measurement and is complicated and easy to implement. However, the saturated salt method has strict requirements on the balance between the liquid and gas phases, and has higher requirements on the fluctuation of the ambient temperature. It requires a long time to balance, and the low humidity point requires longer. Especially when the difference between the humidity in the high and low temperature test chamber and the humidity in the bottle is large, the balance needs 6 to 8 hours each time it is opened. Retro Luxurious Mirror Frame,Vintage Luxury Mirror Frame,Large Decorative Mirrors,Gold Retro Mirror Frame,Best Retro Luxurious Mirror Frame ZHEJIANG NEW WOOD MATERIAL TECHNOLOGY CO.,LTD , https://www.newmaterialfurniture.com