How to keep the constant temperature and humidity chamber stable

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The stability of the constant temperature and humidity test chamber is directly related to whether the test can be performed normally. In addition to the manufacturer's design and the stability of the test chamber, the various settings in the customer's use process also have an important impact on the stability. However, in the daily use process, many users only operate according to the instructions or according to what they think, in order to make good use of the equipment and make it work.




The stability of the constant temperature and humidity test chamber is closely related to the refrigeration system. The medium-temperature refrigerant R404A that is generally used in the single-stage refrigeration cycle in the test chamber, the temperature taken in the actual tank is approximately -36.5°C. By lowering the evaporation pressure of the compressor, the low temperature can be reduced to -50°C. If you need a lower temperature, you need to use a cascade refrigeration cycle. In this way, the refrigeration stability of the constant temperature and humidity test chamber can be guaranteed, thereby ensuring the stability of the test chamber.

The chamber's refrigeration system and compressor complement each other. Regardless of the refrigerant, the lower the evaporation pressure, the lower the evaporation temperature. If the evaporation temperature is too low and the refrigerant is solidified, the flow and circulation of the refrigerant cannot be achieved; the pressure decreases and the refrigerant volume increases. The suction volume will increase, and the compressor volume will be greater.

The refrigeration system of the constant temperature and humidity test box is related to the cooling and dehumidification of the test box. For each setting of the equipment, the corresponding program will be started, resulting in different effects. Therefore, to understand the structure and principle of the test chamber and its important, correct and reasonable use, in order to achieve the desired results. Reasonably set the refrigeration system and other components to ensure the stability of the test chamber.