Constant temperature and humidity test chamber for the majority of users is not strange, the equipment is mainly suitable for electronics, electrical appliances, cell phones, communications, instrumentation, plastic products, metal, food, chemical, building materials, medical, aerospace and many other different areas of products to detect the quality of the use of, when the equipment in the use of time is too long, or due to improper operation, it will cause the equipment appears to be slow to cool down the situation, the How to solve this problem, the following small make up and hit everyone together for technical discussion:
Reason one:
1, due to the constant temperature and humidity test chamber temperature can not be maintained, you need to observe the refrigeration compressor in the process of running the equipment to start, if the compressor in the process of running the equipment can be started, then, it shows that from the mains power supply to the compressor of the Electrical lines are all normal, and the electrical system is no problem.
2, if there is no problem with the electrical system, you need to continue to check the refrigeration system. First of all, check the two groups of refrigeration units of low-temperature compressor exhaust and suction pressure are lower than normal, and suction pressure for the pumping state, it shows that the main refrigeration unit is not enough refrigerant.
3, hand touch the main unit of R23 compressor exhaust and suction pipeline, if you find the temperature of the exhaust pipeline is not high, and the temperature of the suction pipeline is not low, which also indicates that the main unit of refrigerant is not enough.
Reason two,
1, has not yet determined the cause of the failure, combined with the control process of constant temperature and humidity test chamber to further confirm the cause of the failure, because the device has two sets of refrigeration units.
2, one for the main unit, the other for the auxiliary unit, in the cooling rate of the equipment is larger, the two sets of units work at the same time, at the beginning of the temperature maintenance stage, the two sets of units still work at the same time. And when the temperature is initially stabilized, the auxiliary unit stops working, the main unit to maintain temperature stability. If the main unit R23 leaks, it will make the main unit's refrigeration effect is not great, because the cooling process, the two sets of units work simultaneously, so there is no temperature stabilization phenomenon, and instructions to reduce the cooling rate. In the stage of temperature maintenance, once the auxiliary unit stopped working, the main unit and no refrigeration effect, and the air inside the box will slowly rise, when the temperature rises to a certain level, the control system will start the auxiliary unit to cool down, the temperature will drop to the set value (-55 ℃) near the auxiliary unit, and then stop working, and so on and so forth, there will be a slow cooling of the fault phenomenon.
Reference model: LRHS-101-LH
LRHS-225-LH
LRHS-504-LH
LRHS- 800-LH
LRHS-1000-LH
LRHS-1000-LH