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Do you know how the constant temperature and humidity chamber is repaired?
After a long-term discovery and research, the failure of the constant temperature and humidity test chamber has four common situations and the solutions are as follows:
1. In the high temperature test, if the temperature change does not reach the test temperature value, you can check the electrical system and troubleshoot one by one. If the temperature of the constant temperature and humidity chamber rises very slowly, check the air circulation system to see if the adjustment baffle of the air circulation is opened normally, otherwise, check if the motor of the air circulation is operating normally. If the temperature overshoot is severe, then you need to tune the PID setting parameters. If the temperature rises directly, over-temperature protection, then, the controller fails, the control instrument must be replaced.
2. When the low temperature of the constant temperature and humidity chamber does not reach the test index, then you have to 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 be checked and done. Whether to dry the studio before the low temperature test, keep the studio dry, and then put the test sample in the studio to do the test. Whether the test sample in the studio is placed too much so that the wind in the studio cannot be fully circulated. After the above reasons, it is necessary to consider whether it is a fault in the refrigeration system so that it is necessary to ask the test chamber manufacturer's professional personnel to perform maintenance. The latter phenomenon is caused by the poor use environment of the constant temperature and humidity chamber equipment. The ambient temperature and placement position (the distance between the back of the box and the wall) of the equipment must meet the requirements (there are provisions in the equipment operation instructions).
3. In the damp and heat test of the constant temperature and humidity test chamber, it appears that 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 drying of the gauze on the wet bulb sensor. It is necessary to check whether there is a water shortage in the water tank of the wet bulb sensor. 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 works normally and whether the water level controller works normally. Another possibility is that the wet ball gauze will harden due to the long use time or the purity of the water supply, making the gauze unable to absorb water and dry. The above phenomenon can be eliminated by replacing or cleaning the gauze. The latter phenomenon is mainly that the humidification system of the constant temperature and humidity chamber 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 for controlling the water level of the humidification boiler is normal, and whether the water level in the humidification boiler is normal. If everything above is normal, then check the electrical control system, which requires professional maintenance personnel to overhaul.
4. When this environment test equipment suddenly fails during the test operation, if there is a corresponding fault display prompt on the control instrument, there will be an audible alarm prompt. The operator can quickly check which type of fault belongs to in the troubleshooting chapter in the operation of the equipment, and then ask professionals to quickly troubleshoot the fault to ensure the normal progress of the test. If there are other phenomena in the use of other environmental equipment, it is necessary to look at the specific phenomena, analyze and eliminate them.
The above is all the content of this article to share with you the common failure phenomena and solutions of the constant temperature and humidity test.