Analysis of common faults and remedies for constant temperature and humidity machines
1, the low temperature can not reach the test index, then you have to observe the temperature changes, the temperature drop is very slow, or the temperature has risen after a certain value of the trend, the former must check, do low temperature test before After the drying in the studio, the laboratory is kept dry and then the test sample is placed in the work chamber for further testing. The test sample in the work chamber is placed too much, so that the air in the work chamber cannot be fully circulated, and the constant temperature and humidity machine eliminates the above After the reason, it is necessary to consider whether it is a fault in the refrigeration system. In this case, it is necessary to ask the factory's professionals to perform the inspection. The latter phenomenon is caused by the poor use environment of the equipment. The ambient temperature of the equipment and the location of the equipment (the distance between the cabinet and the wall) must meet the requirements (both are specified in the equipment operating instructions).
2. In the high temperature test, if the temperature change fails to reach the test temperature value, the electrical system can be checked and the faults can be eliminated one by one. If the temperature rises very slowly, it is necessary to look at the air circulation system and see if the adjustment baffle of the air circulation is normally open. Conversely, check whether the motor operation of the air circulation is normal. If the temperature overshoots badly, then you need to set the PID setting parameters. If the temperature rises directly, over-temperature protection, then the controller fails and the control instrument must be replaced.
3. In the heat and humidity test, the actual humidity of the constant temperature and humidity machine will reach 100% or the actual humidity and the target humidity will differ greatly. The value is much lower. The former phenomenon may be caused by dry gauze on the wet ball sensor. It is necessary to check whether the water tank in 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 supply system of the water level controller of the high and low temperature constant temperature and humidity testing machine is normal and whether the water level controller is working properly. . Another possibility is that the wet ball gauze may cause the gauze to become hard due to the long use time or the purity of the water supply, so that the gauze cannot absorb moisture and dry, and the above phenomenon can be eliminated only by replacing or cleaning the gauze. The latter phenomenon is mainly because the humidification system 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. Control whether the water level of the humidifying boiler water level is normal and whether the water level in the humidifying boiler is normal. If all of the above is normal, then check the electrical control system, which requires professional maintenance personnel to perform maintenance.
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