Programmable constant temperature and humidity box stability setting method The stability of the constant humidity and humidity test chamber is half of the manufacturer's design, which cannot be changed by the customer during use; the other half is the setting during use, which can be controlled by the customer. The good and bad of the machine depends mostly on how you use it. However, most of the users of the factory are not professionally trained. They can only operate according to a paper manual, and it is difficult to achieve the ideal state. When it comes to the stability of the constant temperature and humidity tester, it is necessary to talk about the refrigeration system of the constant temperature and humidity chamber. The medium temperature refrigerant used in the single-stage refrigeration cycle in the programmable constant temperature and humidity chamber is R404A. The evaporation temperature is -46.5 °C at one atmosphere, but the heat transfer temperature difference of the air-cooled condenser is usually about 10 °C, that is, If you can only get a low temperature of -36.5 °C in the box, what do you need to get a lower temperature? At this time, you can lower the minimum evaporation temperature of R404A refrigerant by lowering the evaporation pressure of the compressor. -50 ° C, so to get a low temperature of -50 ° C and below, it is necessary to take a medium-temperature refrigerant and low-temperature refrigerant cascade refrigeration cycle, in order to ensure the stability of the programmable constant temperature and humidity box refrigeration. The refrigeration system and compressor of the programmable constant temperature and humidity chamber are complementary. The minimum evaporation temperature of the single-stage vapor compression refrigerator depends mainly on its condensation pressure and compression ratio. Baoditong technicians summed up such an experience: First, the lower the evaporation temperature of any refrigerant, the lower the evaporation pressure. 2. When the evaporation temperature is too low, some common refrigerants have reached the solidification temperature, and the flow and circulation of the refrigerant cannot be achieved. Third, the evaporation pressure is reduced, the volume of the refrigerant is increased, and the mass flow rate of the refrigerant is reduced. At this time, to obtain the required cooling capacity, the suction volume must be increased, so that the compressor volume is too large. The cooling and dehumidification of the programmable constant temperature and humidity chamber are all done by the refrigeration system. The same system can make the machine reach two different states, which are all operated by people, so the temperature constant humidity tester is accurately set. The working system is very important, and the correct and correct use can achieve the results you want. The constant temperature and humidity test chamber of Jane has won the majority of users and market share with exquisite technology, excellent quality and meticulous service. The products sell well all over the country, Southeast Asia and Europe, and have a large number of famous domestic and foreign research institutes and enterprise users. One of the fastest growing companies in the same industry in China, with the largest test machine sales and market share. Please pay attention to our simple instrument for more details. Zhejiang CC Industrial And Trading Co., Ltd , https://www.ccraincoats.com