What is the general situation of high and low temperature test chamber instability?
For a variety of reasons, it may cause failure inside the high and low temperature test chambers and result in failure to complete the test. In the case that the temperature of the high and low temperature test chambers is not stable, it is first necessary to find out whether the high and low temperature test chamber refrigeration compressors can be started during operation. If feasible, this indicates that the main power supply is stable, however If you look for the cause from other systems and there is no problem with the electrical system, then continue to check the refrigeration system.
The two sets of refrigeration compressors in the high and low temperature test chambers should be inspected. The dehumidification of the low pressure compressor with the low exhaust and suction pressure values ​​and the inspiratory pressure showing an evacuation state indicates that the refrigerant capacity of the main refrigeration unit is obviously insufficient. In addition, the exhaust and suction lines of the R23 compressor of the main unit of the high and low temperature chamber should be tried by hand. If the temperature of the exhaust line is not high and the suction line is not low, the refrigerant is severely explained. lack of. There is another auxiliary unit in the high and low temperature test chamber. In the case of a large cooling rate, the two units work simultaneously in the initial stage of temperature maintenance, and the two units are still running synchronously, after the temperature is stabilized. The auxiliary unit will stop working, and the rest will retain the host group to maintain the temperature drop. Under the temperature holding state, once the auxiliary unit stops working, the main unit has the cooling effect, the air temperature in the high and low temperature test chamber will rise slowly, and when the temperature rises to a certain level, the control system will start its The auxiliary unit cools down, and repeated work will cause unstable temperature.
There is a case of low temperature instability of the high and low temperature test chambers , and the temperature regulation and setting treatment during the test should have relevant cooperation. Not only the operation during the test but also the regular maintenance, every system and spare parts in the high and low temperature test chamber need to be leaked and repaired.
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