Ding Bao analyzes the reason why the constant temperature and humidity test chamber is not cooled
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Frequently, customers will ask, the constant temperature and humidity test chamber will often appear uncooled. Why is this? Is it because the quality of the machine is not up to standard? of course not. Now we will discuss the research with everyone and see what factors have caused the constant temperature and humidity chamber not to be cooled.
The constant temperature and humidity test equipment is mainly applied to aviation, automobiles, home appliances, scientific research and other necessary testing equipment in these fields. It is also used to test and determine the temperature and environmental changes of electrician, electronic and other products and materials subjected to high temperature, humidity or constant test. After the parameters and performance.
The reasons for not cooling may be the following:
1. We can observe whether the cold compressor can be started during the operation of the constant temperature and humidity test chamber. The compressor can be started during the operation of the environmental test equipment. It shows that the electrical lines from the main power supply to each compressor are Normally, there are no problems with the electrical system.
2. If there is no problem with the electrical system, then continue to check the refrigeration system. The first thing to check is that the exhaust and suction pressures of the low-temperature (R23) compressors of the two sets of refrigeration units are lower than the normal values, and the suction pressure will be in a pumped-out state, indicating that the cooling capacity of the main refrigeration unit is insufficient. of. At this time, we can touch the exhaust and suction piping of the main unit R23 compressor by hand, and we will find that the temperature of the exhaust pipe is not high, and the temperature of the suction pipe is not low, which means that the host The lack of R23 refrigerant.
3, if you do not determine the cause of the fault, then we can combine the control process of the constant temperature and humidity chamber to further confirm the cause of the fault. One is the main unit and the other is the auxiliary unit. When the cooling rate is relatively high, the two units will work at the same time. At the initial stage of the temperature maintenance period, the two units will still work simultaneously. When the temperature stabilizes initially, the auxiliary unit will stop working and the main unit will maintain the temperature stability. If the R23 of the host group is leaked, the cooling effect of the host group will be small. Because the two units work at the same time during the cooling process, there is no phenomenon that the temperature cannot be stabilized, and the cooling rate is indicated to decrease. In the temperature maintenance phase, once the auxiliary unit stops working, the main unit has no cooling effect, and the air in the test chamber will slowly rise. When the temperature rises to a certain extent, the control system will start the auxiliary unit to reduce the temperature and lower the temperature to the desired value. In the vicinity of the fixed value (-55°C), the auxiliary unit will stop working again. If so, the fault phenomenon will occur.
At this point, it can be confirmed that the cause of the production failure is the leakage of the refrigerant R23 of the low-temperature (R23)-class unit of the host group.
"Dingbao" is a hi-tech enterprise specializing in the development, production, sales, and service of test equipment. The products are widely used in scientific research, military, aviation, shipbuilding, post and telecommunications, automobiles, motorcycles, electricians, chemicals, medical care, etc. Electronics, semiconductors, optoelectronics, machinery and other enterprises and institutions and school laboratories. With excellent quality, reasonable price and perfect service network, we provide our customers with the most professional, most efficient and ideal service, so that customers will not have to worry about after purchasing our products. Users are welcome to negotiate.

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