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1. Dew point method is to measure the temperature when wet air reaches saturation, it is a direct result of thermodynamics, high accuracy, wide measurement range. Accuracy of measuring precision dew point meter can reach ± ​​0.2 °C or even higher. But with modern light - The principle of the cold mirror-type dew point instrument intelligent pressure transmitter is expensive, and often used in conjunction with the standard humidity generator.
2. Smart pressure transmitter wet and dry ball method, which was invented in the 18th century, humidity measurement method. Has a long history, the most commonly used. Dry and wet ball method is an indirect method, it uses the wet and dry ball equation to convert the humidity value , And this equation is conditional: that is, the speed of wind around the wet bulb must reach 2.5m / s or more. Commonly used dry and wet bulb thermometer simplifies this condition, so its accuracy is only 5 ~ 7% RH, wet and dry The ball does not belong to the static method, do not simply think that as long as the measurement accuracy of two thermometers is increased, it means that the measurement accuracy of the hygrometer is improved.
3. The double pressure method and double temperature method are based on the principle of thermodynamics P, V, T balance. The equilibrium time is longer. The diversion method is based on the accurate mixing of absolute humidity and absolute dry air. The energy meter believes that due to the intelligent pressure transmitter The use of modern monitoring and control methods, these devices can be done very precise, but due to complex equipment, expensive, time-consuming and labor-consuming, mainly used as a standard measurement, the measurement accuracy of up to ± 2% RH.
4. Intelligent Pressure Transmitters Electronic Humidity Sensors, Electronic Humidity Sensors, and Humidity Measurements are industries that began in the 1990s. In recent years, significant progress has been made at home and abroad in the area of ​​humidity sensor R&D. Humidity sensors are simple Humidity sensors have developed rapidly toward the direction of integration, intelligence, and multi-parameter detection, which has created favorable conditions for the development of a new generation of humidity measurement and control systems, and has also brought moisture measurement technology to a new level.
5. The saturated salt method in the static method is the most common method for measuring humidity in Jiangsu Zhongneng Instrument Technology Co., Ltd. It is simple and easy to implement. However, the saturated salt method has strict requirements on the equilibrium of liquid and gas phases and is stable to the ambient temperature. The requirement is higher. It takes a long time to use for balancing, and the low humidity point requires longer. Especially when the humidity in the room and the humidity in the bottle are large, it needs to be balanced for 6 to 8 hours each time.
The common humidity measurement methods for smart pressure transmitters include: dew point method, wet and dry ball method, dynamic method (dual pressure method, dual temperature method, diverting method), electronic sensor method static method and (saturated salt method, sulfuric acid method) .
September 25, 2021