Introduction of humidity measurement method Humidity measurement is divided into two to thirty different types in principle. However, humidity measurement has always been one of the frustrations known in the world of metrology. The temperature and humidity self-recording device, a seemingly simple amount of value, goes deep into the complex physical-chemical theory analysis and calculations. The beginner may ignore many factors that must be taken into account in the humidity measurement, thus affecting the fairness of the sensor. use. Common methods for measuring humidity include: dynamic method (dual pressure method, dual temperature method, shunt method), static method (saturated salt method, sulfuric acid method), dew point method, wet and dry ball method and electronic sensor method, temperature and humidity self-recording Instrument method. The double-pressure method and double-temperature method are based on the principle of thermodynamic P, V, and T balance. The equilibrium time is long. The diversion method is based on the accurate mixing of absolute moisture and absolute dry air. Because modern measurement and control methods are used, these devices can be made to be precise, but due to the complicated and expensive equipment and time-consuming operation, they are mainly used as a standard measure, and their measurement accuracy can reach ±2%RH or more. The saturated salt method in the static method is the most common method in humidity measurement and is simple and easy to use. However, the saturated salt method has strict requirements on the balance between liquid and gas phases, and has a high requirement for unrestrained ambient temperature. Used to wait for a long time to balance, low humidity requirements longer. Especially when the humidity in the room and the difference in humidity inside the bottle are large, it takes 6 to 8 hours for each opening. The dew point method measures the temperature when the humid air reaches saturation, and is a direct result of thermodynamics. It has high accuracy and wide measurement range. Precision dewpoint metering accuracy can reach ±0.2°C or even higher. However, the cold mirror type dew point meter using modern light-electricity principle is expensive, and is often used together with a scale humidity generator. Wet and dry ball method, which was invented in the 18th century to measure humidity. Has a long history and is most commonly used. Wet and dry ball method is an indirect method. It uses the wet-and-dry ball equation to calculate the humidity value. This equation has the premise that the wind speed around the wet bulb must reach 2.5m/s or more. The commonly used wet and dry bulb thermometer simplifies this premise, so its accuracy is only 5 to 7% RH. Dry and wet bulbs do not belong to the static method. Do not simply think that as long as the measurement accuracy of the two thermometers is improved, it is an improvement. Hygrometer measurement accuracy. Electronic Humidity Sensor Method: Electronic Humidity Sensor Products and Humidity Measurement belong to the industry that started in the 1990s. In recent years, the domestic and overseas research and development in the field of humidity sensors have made considerable progress. Humidity sensors are rapidly developing from simple humidity sensors to integrated, intelligent, and multi-parameter detection. This has created favorable conditions for the development of a new generation of humidity measurement and control systems, and has also brought humidity measurement technology to a new level. Temperature and humidity self-recording method. The temperature and humidity recorder is a recorder that can measure humidity, sometimes called a self-recording thermometer and hygrometer. It can record humidity in the range of 0-100%RH and accuracy in humidity of ±3%RH. In addition, the recorder has instruments similar to wind direction wind speed meters that can measure wind direction and wind speed.
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