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High And Low Temperature And Humidity Test Room Temperature Can Not Be Stable How To Do?
Feb 20, 2018

In the environmental test, if the low temperature and humidity test chamber can not be stable low temperature how to do? Following the technical staff of our company in the many years of practice summed up the experience for your reference:

Low temperature and humidity test chamber can not be stable at low temperature Failure Analysis: First, observe the high and low temperature test chamber refrigeration compressor in the high and low temperature humidity test chamber can start during operation, if the high and low temperature test chamber compressor can start during operation , Indicating that from the main power to the high and low temperature test chamber compressor electrical lines are normal, the electrical system also has no problem. When there is no problem with the electrical system of the high and low temperature test room, the system should be checked. First check the two sets of high and low temperature refrigeration compressor unit, if the low temperature (R23) compressor exhaust and suction pressure are lower than normal, and the suction pressure was evacuated state, which shows the main refrigeration unit The amount of refrigerant is clearly insufficient. Then touch the main unit of the high and low temperature box R23 compressor exhaust and suction lines, such as the exhaust line found in the temperature is not high, the suction line temperature is not low (not frost), which It also illustrates the lack of R23 refrigerant in the main unit. One of the high and low temperature test chambers is the main unit and the other is the auxiliary unit. When the cooling rate is large, the two units work at the same time. In the early stage of temperature maintaining, the two units still work at the same time. When the temperature is initially stabilized, the auxiliary unit will stop working and the main unit will maintain the temperature drop and stability. If the main unit R23 leaks, the cooling effect of the main unit will not be large. Since both units work at the same time during cooling, there is no phenomenon that the temperature is unstable and the cooling rate is lowered. In the temperature holding stage, once the auxiliary unit stops working, the main unit has no refrigeration effect, and the air temperature in the high and low temperature test humidity test room will slowly rise. When the temperature rises to a certain extent, the control system will start the auxiliary unit to cool down again, Then auxiliary unit stopped working again, so repeated, there will be low temperature unbearable failure phenomenon.

High and low temperature and humidity test room maintenance methods: high and low temperature and humidity test chamber of the refrigeration system for leak detection, leak detector and soapy water to check the way where leakage, if found to be hot gas bypass solenoid valve stem Split a slit, then replace the solenoid valve, such as the discovery of leaks elsewhere, the oxygen leak welding repair welding integrity, and then the system re-fluoride, the system can resume normal operation.

It can be seen from the above, the low temperature and humidity test chamber unreliable low temperature phenomenon, analysis and judgment is basically from easy to difficult, first outside after, the first electrical after-air way to analyze and judge, familiar And understand the principle of high and low temperature and humidity test chamber and the working process is to analyze the basis for fault diagnosis. Only in-depth understanding of high and low temperature and humidity test chamber working principle and working process, in order to quickly solve the high and low temperature chamber in the operation of the various problems that arise.


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