A professional answer for you: The high and low temperature test box is an environmental testing instrument. It is suitable for high temperature, low temperature, humidity test, testing the reliability of electronic and electrical, LED, chemical, rubber and plastic products, and improving product quality. However, in the process of operation, if the temperature of the high and low temperature test box fails to reach the temperature index, the low temperature drops slowly, and the humidity cannot run as scheduled. After years of technical research and development combined with practical experience, the following is how to solve the high and low temperature problems. The common failures of the test chamber are analyzed in detail for reference of users who use the high and low temperature test chambers.
Hope to help customers with daily maintenance and maintenance.
I. How to solve the problem that the low temperature of the high and low temperature test box cannot reach the test index?
The high and low temperature test box does not reach the low temperature index. If the temperature drops very slowly, you must observe the temperature change. Is the temperature dropping slowly or the temperature tends to rise after the temperature reaches a certain value, the former must be checked and a low temperature test performed. Whether to dry the working room before, keep the working room dry, and then put the test samples into the working room for testing. Are there too many test samples in the working room, so that the wind in the working room cannot circulate sufficiently? After that, it is necessary to consider whether it is a failure in the refrigeration system, so it is necessary to ask the manufacturer's professionals to perform maintenance. The latter phenomenon is caused by the bad environment of the high and low temperature test chamber equipment. The ambient temperature and the location of the equipment (the distance from the back of the cabinet to the wall) must meet the requirements (there are regulations in the equipment operation and use instructions) .
Second, how to solve the high and low temperature test box during operation, the temperature change does not reach the test temperature value?
In the high temperature test, if the temperature change does not reach the test temperature value, you can check the electrical system and eliminate the faults one by one.
If the temperature of the high and low temperature test box rises slowly, check the air circulation system to see if the regulating baffle of the air circulation is open normally. Otherwise, check whether the motor of the air circulation is operating normally. If the temperature overshoot is severe, you need to set the PID setting parameters. If the temperature rises directly and the over-temperature protection occurs, then the controller fails and the control instrument must be replaced.
3. During the hot and humid test chamber, the humidity does not meet the specified requirements. Where is the problem?
When the high and low temperature test box is doing the hot and humid test, the actual humidity will reach 100% or the actual humidity will be very different from the target humidity. The value is much lower. The former phenomenon: it may be caused by dry gauze on the wet ball sensor. Check whether the water tank of the wet ball sensor is short of water. The water level in the water tank is automatically controlled by a water level controller. Check whether the water level controller water supply system is supplying water normally and whether the water level controller is working properly. 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 cannot absorb the water and dry. Just replace or clean the gauze to eliminate the above phenomenon. The latter phenomenon is mainly that the humidification system of the high and low temperature test box is not working. 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 of the water level in the humidification boiler is normal, and whether the water level in the humidification boiler is normal.
If all of the above are normal, then check the electrical control system, and ask professional maintenance personnel to carry out maintenance. High and low temperature test chambers, because of the time limit for their use, so high and low temperature test chambers that run for a long time will inevitably have a variety of minor faults. Pay attention to regular maintenance and maintenance, which can generally be mostly avoided.