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Constant temperature and humidity test chamber common troubleshooting method
Common structure
In addition to normal operation procedures, test personnel should also have an understanding of their structure. The constant temperature and humidity test chamber is composed of a box body, a wind circulation switcher, a refrigeration switcher, a heating switcher and a humidity control switcher. The air circulation switch generally adopts a structure that can adjust the air supply direction; the humidification switch adopts two kinds of boiler humidification and surface evaporation; the cooling and dehumidification switch adopts an air conditioning working condition refrigeration structure; the heating switch adopts electric heating fin heating and electric furnace wire. The two structures are directly heated; the temperature and humidity test method adopts 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 method of separate temperature and humidity separation and temperature and humidity combined controller.
Second, constant temperature and humidity test box 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 switcher and eliminate the fault one by one. If the temperature rises very slowly, it is necessary to check the air circulation switcher to see if the regulating flap of the air circulation is turned on normally. Otherwise, check whether the motor of the wind circulation is running normally. If the temperature is too high, you need to set the PID setting parameters. If the temperature rises directly and the temperature is over-protected, then the controller fails and the control instrument must be replaced.
2. If the low temperature does not reach the test index, then you should observe the change of temperature, whether the temperature drops very slowly, or the temperature rises after the temperature reaches a certain value. The former should check whether it will be before the low temperature test. Dry the operation room, keep the operation room dry, then put the test sample into the operation room and then test it. If the test sample in the operation room is too much, the wind in the operation room cannot be fully circulated. After eliminating the above reasons, It is necessary to consider whether it is a fault in the refrigeration switch, so it is necessary to ask the professional of the manufacturer for maintenance. The latter phenomenon is caused by the poor use environment of the facility. The ambient temperature at which the facility is placed and the location where it is placed (the distance between the back of the cabinet and the wall) must meet the requirements (as specified in the operating instructions for the facility).
3. In the damp heat 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 may be caused by the drying of the gauze on the wet ball sensor. Whether there is water shortage in the water tank of the ball sensor, the water level in the water tank is automatically controlled by a water level controller. Check whether the water supply controller water supply is normal and the water level controller is operating 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 caused by the humidification switch not working. Check the water supply switcher of the humidification switcher, whether there is a certain amount of water in the water supply switcher, whether the control of the humidification water level is normal, and whether the water level in the humidification boiler is normal. If everything above is normal, then check the electrical control switch, which should be repaired by professional maintenance personnel.
4. When the facility suddenly fails during the test operation, the corresponding fault display prompt appears on the control meter and there is an audible alarm prompt. The operator can quickly check which type of fault is in the troubleshooting chapter of the facility's operation and use, and then ask the professional to quickly eliminate the fault to ensure the normal operation of the test. Other environmental testing facilities will have other phenomena in use, which will be specific phenomena, specific analysis and elimination.
The environmental test facilities should also be regularly maintained, the condensers of the refrigeration switchers should be cleaned regularly, the moving parts should be lubricated according to the instructions, the electrical control switches should be regularly maintained and checked, etc. These operations are essential.
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