In addition to the correct operation of the operating procedures of the liquid cold and thermal shock test chamber, the user should also have an understanding of the structure. The structure of liquid cold and heat shock test chamber is composed of wind circulation system, refrigeration system, heating system and humidity control system. The existence of these systems is directly related to the price of the liquid thermal shock test chamber. The air circulation system generally adopts a structure that can adjust the direction of air supply. The humidification system has two types: boiler humidification and surface evaporation. The cooling and dehumidifying system adopts the cooling structure of air conditioner. The heating system adopts two structures: electric heating fin heating and electric furnace wire direct heating. The temperature and humidity test method uses the dry and wet ball test method, and the humidity sensor direct measurement method is also used. The control and display operation interface adopts the methods of separate temperature and humidity and combined temperature and humidity controller.
During the high temperature test of the liquid cold and thermal shock test box, if the temperature change does not reach the test temperature value, you can check the electrical system and gradually eliminate the fault. If the temperature rises very slowly, then check the wind circulation system to see if the adjustment baffle of the wind circulation is turned on normally. Otherwise, check whether the motor of the wind circulation is operating normally. If the temperature overshoot is severe, then the PID setting parameters need to be adjusted. If the temperature rises directly and the over-temperature protection, then the controller fails, the control instrument must be replaced.
If the low temperature does not reach the test index, then we must observe the temperature change, whether the temperature drops slowly, or the temperature has a tendency to rise after the temperature reaches a certain value, the former should check whether the studio is dried before the low temperature test Dry, keep the studio dry, and then put the test sample into the working room to conduct the test. Whether the test sample in the working room is placed too much, the wind in the working room cannot be fully circulated. After eliminating the above reasons, you must consider whether It is a fault in the refrigeration system. If this is the case, it is necessary to ask the manufacturer's professional personnel for maintenance.
In the wet heat test, the actual humidity will reach 100% or the actual humidity is very different from the target humidity, and the value is much lower. The former phenomenon: it may be caused by the dry gauze on the wet ball sensor, then check the wet ball sensor Is there any water shortage in the water tank, the water level in the water tank is automatically controlled by a water level controller, check whether the water supply system of the water level controller is normal, and whether the water level controller works normally. Another possibility is that the wet ball gauze will harden the gauze due to the long use time or the purity of the water supply, so that the gauze can not absorb the water and dry. Just replace or clean the gauze to eliminate the above phenomenon. The latter phenomenon is mainly because the humidification system does not work, check the water supply system of the humidification system, whether there is a certain amount of water in the water supply system, whether the water level control to control the water level of the humidification boiler is normal, and whether the water level in the humidification boiler is normal. If all of the above is normal, then check the electrical control system, which requires professional maintenance personnel to carry out maintenance.
Ai Sili specializes in the production of stainless steel cold and heat shock test boxes, non-standard cold and heat shock test boxes and other test equipment. It has many years of production experience. Professional production environment testing equipment.
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