Do you know how to properly maintain and maintain constant temperature and humidity machines?
The constant temperature and humidity test chamber is a test chamber that integrates high temperature, low temperature, and humid heat-high and low temperature and humidity alternating heat test chamber. Its repair is more difficult than other environmental test equipment and is representative. The following is an example of the high and low temperature humid heat alternating test chamber, to talk about the structure of the constant temperature and humidity test chamber and some common faults and troubleshooting methods.
1. Construction of constant temperature and humidity test chamber The constant temperature and humidity test chamber is composed of a box body, an air 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 air supply; the humidification system has two types of boiler humidification and surface evaporation; the cooling and dehumidification system uses air-conditioning working structure cooling structure; the heating system uses electric heating fin heating and electric furnace wire direct heating Structure; the temperature and humidity test method uses the wet and dry bulb test method, and also the direct measurement method with the humidity sensor; the control and display operation interface adopts the temperature and humidity separate independent and temperature and humidity combined controller and other methods.
2. Some common faults and troubleshooting methods of the constant temperature and humidity test chamber â—† In high temperature tests, such as when 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 rises very slowly, it is necessary to check the wind circulation system to see if the adjustment baffle of the wind circulation is opened normally, otherwise, check whether the motor of the wind circulation is operating normally. If the temperature overshoot is severe, 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.
â—† Low temperature can not reach the test index, then you should 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 it will work before the low temperature test Dry the room, keep the studio dry, and then put the test samples into the work room to test. Whether the test samples in the work room are placed too much, so that the wind in the work room cannot be fully circulated. After eliminating the above reasons, it is necessary Consider whether it is a fault in the refrigeration system. In this case, the professional personnel of the manufacturer must be repaired. The latter phenomenon is caused by the poor use environment of the equipment. The ambient temperature of the equipment and the location (the distance between the back of the box and the wall) must meet the requirements (as specified in the operation instructions of the equipment).
â—† During the heat and humidity test, the actual humidity will reach 100% or the actual humidity is very different from the target humidity, 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 Whether the water tank of the sensor is short of water, 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.
â—† When the equipment suddenly fails during the test operation, the corresponding fault display prompt and sound alarm prompt appear on the control instrument. The operator can quickly check which type of fault belongs to the chapter of troubleshooting in the operation and use of the device, and then you can ask a professional to quickly troubleshoot to ensure that the test is carried out normally. There will be other phenomena in the use of other environmental test equipment, then specific phenomena, specific analysis and elimination are required.
The constant temperature and humidity test chamber should be regularly maintained, the condenser of the refrigeration system should be cleaned regularly, the moving parts should be lubricated according to the instructions, and the electrical control system should be regularly maintained and inspected. These tasks are essential.
Dongguan Aoxing Audio Visual Equipment CO.,Ltd , https://www.aoxingaudio.com