LAM Frequency Instruments

In order to meet the test requirements of the constant temperature and humidity test chamber, it is inevitable to perform humidification and dehumidification operations on the test chamber. Currently, our staff use a variety of methods to analyze and point out their respective advantages and disadvantages and recommended uses. conditions of. Times are changing, and in order to make the test chamber humidification project more perfect, we have been making continuous progress.
There are many ways to express humidity. As far as test equipment is concerned, the concept of relative humidity is usually used to describe humidity. The process of humidification is actually to increase the water vapor partial pressure. The initial humidification method is to pour water into the wall basin of the constant temperature and humidity test chamber, and control the water surface saturation pressure by controlling the water temperature. This method was used in the 1950s. Because it cannot meet the needs of high humidification requirements for alternating humid heat, more importantly, when spraying the box wall, water droplets inevitably splash on the test sample, causing varying degrees of contamination to the test sample. At the same time, there are certain requirements for drainage in the box, so this method was quickly replaced by steam humidification and shallow water tray humidification. But this method still has some advantages. Although its control transition process is long, the humidity fluctuation is small after the system is stabilized, so it is more suitable for constant humidity and heat tests. In addition, if the water vapor is not overheated during the humidification process, it will not add additional heat to the system. In addition, when the temperature of the spray water is controlled to be lower than the key temperature required by the test, the spray water has a dehumidifying effect.
With the development of damp heat tests from constant damp heat to alternating damp heat, faster humidification response capabilities are required. When spray humidification can no longer meet the requirements, steam humidification and shallow water tray humidification methods have begun to be widely adopted and developed.
How to make the constant temperature and humidity test chamber humidification project more perfect
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