Explain the construction of hot and cold test chamber and troubleshooting

Presumably, very few people know what the cryogenic chamber is constructed, what materials to use, and what configuration to use. I think very few people know that if the test chamber fails and is eliminated, what should be done? Answered by our Xiaotian Xiaobian:

First, the construction of common high and low temperature damp heat test chamber

In addition to the correct operation of the test personnel according to operating procedures, it should also understand its structure. The high and low temperature damp heat test chamber is composed of a box body, a wind circulation system, a refrigeration system, a heating system and a humidity control system. The air circulation system generally adopts a structure that can adjust the direction of the air supply; the humidification system uses two types of humidification of the boiler and the surface evaporation; the cooling and dehumidification system adopts the air conditioning mode refrigeration structure; the heating system adopts heating fin heating and direct heating of the electric furnace wire Two kinds of structures; the temperature and humidity test method adopts the dry and wet ball test method, and also the direct measurement method of the humidity sensor; the control and display operation interface adopts the method of separate temperature and humidity separation and temperature and humidity combined controller.

Second, the high temperature and humidity test chamber of the common faults and troubleshooting methods:

1 , in the high temperature test, if the temperature change does not reach the test temperature value, you can check the electrical system, remove the fault one by one. If the temperature rises very slowly, it is necessary to check the air circulation system to see if the regulating baffle of the wind cycle is normal. On the contrary, check whether the motor of the wind cycle is running normally. If the temperature overshoots badly, then you need to set the PID setting parameters. If the temperature rises directly and the temperature is over-protected, then the controller will be out

In case of a fault, the control instrument must be replaced.

2. If the low temperature fails to reach the test target, then you must observe the change of temperature. It is the temperature drop is very slow, or the temperature rises after the temperature reaches a certain value. The former must check whether it will be before the low temperature test. After drying in the studio, the test chamber is kept dry, and then the test sample is placed in the work chamber and tested again. The test chamber inside the work chamber is placed too much, so that the air in the work chamber cannot be fully circulated. After eliminating the above reasons, It is necessary to consider whether it is a fault in the refrigeration system. In this case, it is necessary to ask a manufacturer's professional to perform the repair. The latter phenomenon is caused by the poor use of the equipment. The ambient temperature at which the equipment is placed and the location where it is placed (the distance between the rear of the cabinet and the wall) must meet the requirements (as specified in the operating instructions for the equipment).

3 , in the hot and humid test, the actual humidity will reach 100% or the actual humidity and the target humidity is very different, the value is much lower, the former phenomenon: may be caused by dry gauze on the wet ball sensor, then check the wet Whether there is water shortage in the ball sensor's water tank, the water level in the water tank is automatically controlled by a water level controller, and the water level controller water supply system checks whether the water supply is normal and whether the water level controller works normally. Another possibility is that the wet gauze is hardened due to the long use time or the purity of the water supply, so that the gauze becomes hard and the gauze can not absorb moisture and is dry. The above phenomenon can be eliminated by replacing or cleaning the gauze. The latter phenomenon is mainly because the humidification system is not working. Check the water supply system of the humidification system. Check if there is a certain amount of water in the water supply system. Control whether the water level of the humidifying boiler water level is normal and whether the water level in the humidifying boiler is normal. If all of the above is normal, then check the electrical control system, which requires professional maintenance personnel to perform the repair.

4. When the equipment suddenly fails during the test operation, a corresponding fault display prompt appears on the control instrument and there is an audible alarm. The operator can quickly check which type of fault belongs to in the troubleshooting section of the operation of the equipment, and the professional can quickly eliminate the fault to ensure the normal operation of the test. Other environmental testing equipment will have other phenomena in use, and it will be specific phenomena, specific analysis and elimination.

The environmental test equipment should also be regularly maintained, the condenser of the refrigeration system should be cleaned regularly, the moving parts should be lubricated according to the instructions, the electrical control system should be regularly maintained and checked, etc. These tasks are essential.

Haotian test equipment mission is everything oriented to the needs of customers, providing customers with good products, with excellent quality and quick and responsible work enthusiasm to get customers' trust and support.

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