Reasons for the temperature of the constant temperature and humidity experiment box not reaching the set value

NOKI Chamber am9:23

High and low-temperature test chamber inner box regulations

1. For experimental samples with a volume less than or equal to 1000cm3:

a. Heat dissipation is less than or equal to 50W

The minimum distance between all the surface layers of the experimental sample and the matching box wall is not less than 10 cm;

b. Heat dissipation exceeds 50W and less than or equal to 100W

The minimum distance between all the surface layers of the experimental sample and the matching box wall is not less than 20 cm;

2. Experimental samples with a volume exceeding 1000cm3:

a. The minimum distance between all the surface layers of the test sample and the matching box wall should be 10 cm unless it is a test sample

The relationship between the volume and the output power loss of the enterprise’s surface layer is required to be higher than the interval according to the graph in Figure A1.

b. The ratio of the capacity of the environmental test box to the volume of the test sample should not be less than 5:1;

c. During the experiment, the experimental sample should be placed in the middle of the environmental test box as much as possible, so that there is as much indoor space as possible between all parts of the experimental sample and the wall of the box;

d. The detection of working temperature should meet the requirements of relevant working temperature in GB/T2422;

Why the temperature of the constant temperature and humidity equipment test chamber cannot reach the preset value

The constant temperature and humidity equipment test chamber often finds that the temperature cannot reach the preset value after a period of application, so what is going on that causes the temperature to fail to reach the preset value?

1. The most common reason is that the test box of constant temperature and humidity equipment is not cooled due to the long application period and lack of maintenance. It mainly investigates whether the refrigeration unit can be started during the whole process of the text box. The refrigeration compressor runs fully in the natural environment. The process can be started, indicating that everything is normal from the main switch to the power supply to the household appliances route of the refrigeration compressors.

Secondly, if there is no problem with the circuit system of the constant temperature and humidity equipment test box, continue to check the refrigeration unit. The main check is that the exhaust pipes and breathing working pressures of the ultra-low temperature (R23) refrigeration compressors of the 2 sets of refrigeration units are slightly lower than the standard values, and the breathing working pressure is absent, indicating the lack of refrigerant in the main refrigeration unit. Finally, I touched the exhaust pipe and breathing pipe of the main generator set R23 refrigeration compressor by hand and found that the temperature of the exhaust pipe is not high, and the temperature of the breathing pipe is not low (not frosted), which also means that the main generator set is clear The R23 refrigerant is lacking.

2. If it is not a dilapidated problem, then we must first investigate the temperature change, whether the temperature drop is relatively slow, or the temperature rises after the temperature reach a certain value, the former one needs to be checked, whether it is before the ultra-low temperature test Dry the studio to make the studio persevere and boring, and then put the test samples in the workroom for testing. Whether there are too many test samples in the workroom, so that the wind in the workroom cannot be circulated enough After cleaning the system, it is necessary to consider whether it is a common fault in the refrigeration unit. In that case, we need to ask our professional technicians of Baixin equipment to carry out maintenance.

Analysis of common operating errors in the constant temperature and humidity test chamber

1. When the constant temperature and humidity test chamber is in operation, open the tailgate, causing the high-temperature cyclone to break outward and cause unnecessary damage;

2. During the installation of the environmental test box, the grounding device is not properly installed, which may cause the risk of electric shock accident;

3. When the lighting fixture is not required to observe the situation, turn on the lighting fixture inside, which will endanger its temperature control;

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