I. Structure of High and Low Temperature Electric Furnace
In addition to operating the equipment accurately according to the operating rules, the experimenters should also have some knowledge of its structure.
The high and low temperature humidity and heat test box is composed of the box, the air circulation system, the refrigeration system, the heating system and the humidity control system. The air circulation system usually adopts the structure of adjustable air supply direction. There are two kinds of humidification system: boiler humidification and surface transpiration. The cooling and dehumidification system adopts air conditioning refrigeration structure. The heating system adopts two kinds of structure: electric fin heating and direct heating of electric furnace wire. The method of temperature and humidity test is dry and wet bulb test, and it is also a direct method of humidity sensor measurement. Temperature and humidity are separated independently and temperature and humidity are combined to control and display the operation interface.
2. Common faults and cleaning methods of high and low temperature humidity and heat test box
1. In the high temperature experiment, if the temperature change can not reach the experimental temperature value, we can check the electrical system and remove the faults one by one. If the temperature rises very slowly, we should check the wind cycle system, see if the conditioning baffle of the wind cycle is open normally, and vice versa, check whether the motor operation of the wind cycle is normal. If the temperature is too high, the setting parameters of PID need to be adjusted. If the temperature rises directly and the overtemperature is maintained, then the controller is out of order and the control appearance must be replaced.
2. If you can't reach the principle of experiment in the low temperature experiment, then you should observe the change of temperature. It's a very slow drop in temperature. It's still a trend that the temperature will rise again after the temperature reaches a certain value. The former should check whether drying the working room before doing the low temperature experiment can make the working room insist on drying and then putting the experimental sample into the working room to do the experiment. The experimental sample in the working room is: It's not that there are too many places, so that the wind in the operating room can't circulate adequately. After removing the above reasons, we should think about whether there is a problem in the refrigeration system, so we need to ask the professionals of the manufacturer to repair it. The latter is due to the poor operating environment of the equipment. The environmental temperature and location of the equipment (the distance between the back of the box and the wall) should meet the requirements (which are stipulated in the operation instructions of the equipment).
3. In the humidity and heat experiment, the practical humidity will reach 100%, maybe the practical humidity is quite different from the policy humidity, and the value is much lower. The former may be caused by the dryness of gauze on the wet-bulb sensor. It is necessary to check whether there is water shortage in the wet-bulb sensor tank. The water level in the tank is automatically controlled by a water level controller. It is also necessary to check whether the water supply system of the water level controller is normal and whether the operation of the water level controller is normal. Another possibility is that wet bulb gauze can harden the gauze due to its long use time or the purity of water supply, which makes the gauze dry and unable to absorb moisture. The above appearance can be swept away by replacing or cleaning the gauze. The latter mainly shows that 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 of the humidification boiler is normal or not, and whether the water level in the humidification boiler is normal. If all the above is normal, you should check the electrical control system, which requires professional repairmen to repair.
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