The high and low temperature test chamber can be upgraded to a high and low temperature humid heat test chamber according to user needs. The test chamber also has humidification and dehumidification devices. The temperature range is slightly different from that of the constant temperature and humidity test chamber.
Humidification system of high and low temperature test chamber: steam is generated by heating the water through the heating tube, and the humidity is formed into the box. After the cantilever spraying method used in the early days is eliminated, boiler steam humidification gradually appears, but it is difficult to maintain due to the slow response It is now gradually replaced by shallow tank humidification. The principle of humidification is similar to that of an electric kettle. As the temperature gradually increases, the humidity becomes higher and higher. When the temperature reaches above 95 degrees, the humidity will become 100% moisture. If you want to How to achieve low humidity? Next, let's take a look at the dehumidification system of the high and low temperature test chamber: the current dehumidification methods are divided into mechanical refrigeration dehumidification and dry dehumidification. Dry dehumidification means that dry air is flushed into the test chamber to force Realize the low humidity site, but the uniformity in the box cannot be guaranteed. The dehumidification method that is more recognized and scientific in the current environmental testing industry is still mechanical refrigeration dehumidification, which is dehumidified by the principle of condensation dehumidification. When the refrigeration system is working, the temperature of the fins on the surface of the evaporator It will be lower than the dew point temperature of the test temperature and humidity. When the air circulates, condensation will occur when the moisture passes through the surface of the evaporator, thus achieving For the purpose of dehumidification, the dehumidification system is a stand-alone compression refrigeration cycle. The system consists of a compressor, an air (water) condenser, a pressure accumulator, a drying filter, a solenoid valve, a capillary tube, and an evaporator.
The above is about the humidification and dehumidification system. If the sample to be tested is completely incapable of contacting any water vapor during the conversion between the high temperature and low temperature tests of the test chamber, it is well known that when the product under test drops to low temperature at normal temperature (it will Frost), when frost rises to high temperature, frost naturally melts into water when it encounters high temperature, how to ensure a frost-free state? There are two ways to achieve it, one is to flush into the dry air, and the dry dehumidification we described above is a The other principle is to flush nitrogen into the tank to keep the tank in a vacuum state (under vacuum, the freezing point of water is -200 degrees), so the low temperature point of our standard test box will not produce any freezing point, that is, There is no humidity. (The tested products that can not touch any water vapor include circuit boards, electric control boxes, control cabinets, etc.)
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