Programmable Environmental Temperature And Humidity Chamber Operation Note Points

How to Properly Maintain Environmental Test Equipment?

There are many types of environmental test equipment, but a wide range of environmental testing equipment is used for high temperature, low temperature, and damp heat test chambers. Today, it is a collection of high-temperature, low-temperature, and damp-heated test chambers. It is difficult to repair. Compared with other environmental testing equipment, it is representative. The following is an example of a high-low temperature hot-humidity test box, to talk about the structure of the high-low temperature damp heat test box and some common faults and troubleshooting methods.
(I) Construction of Common High-Low Temperature Humidity Test Chambers
In addition to the correct operation of the test personnel according to operating procedures, it should also understand its structure. The high-low temperature damp heat test box is composed of a box body, a wind 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 the air supply; the humidification system uses two types of humidification of the boiler and the surface evaporation; the cooling and dehumidification system adopts the air conditioning mode refrigeration structure; the heating system adopts heating fin heating and direct heating of the electric furnace wire Two kinds of structures; temperature and humidity testing methods using wet and dry ball testing methods, but also useful for direct measurement of humidity sensors; control and display interface using separate temperature and humidity and temperature and humidity combination controller and other methods.
(2) Some common faults and remedies for high and low temperature damp heat test chambers:
1. In the high temperature test, if the temperature change does not 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 wind circulation system and see if the adjustment baffle of the wind circulation is normally open. Conversely, check whether the motor operation of the wind 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.
2. If the low temperature fails to reach the target of the test, then you must observe the change of temperature. It is the temperature drop is very slow, or the temperature has a tendency to rebound after the temperature reaches a certain value. The former must check whether it will be before the low temperature test. After drying in the studio, the test chamber is kept dry, and then the test sample is placed in the work chamber and tested again. The test chamber inside the work chamber is placed too much, so that the air in the work chamber cannot be fully circulated. After eliminating the above reasons, It is necessary to consider whether it is a fault in the refrigeration system. In this case, it is necessary to ask a manufacturer's professional to perform the repair. 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 (in the operating instructions of the equipment).
3. In the hot and humid test, the actual humidity will reach 100% or the actual humidity and the target humidity are very different, and the value is much lower. The former phenomenon may be caused by dry gauze on the wet-bulb sensor. Then check the wetness. Whether there is water shortage in the ball sensor's water tank, the water level in the water tank is automatically controlled by a water level controller, and the water level controller water supply system checks whether the water supply is normal and whether the water level controller works normally. 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 the moisture and dry, and the above phenomenon can be eliminated simply 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. Check if 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 the repair.
4. When the equipment suddenly fails during the test operation, a corresponding fault display prompt appears on the control instrument and there is a voice alarm. The operator can quickly check which type of fault belongs to in the troubleshooting section of the operation of the equipment, and the professional can quickly eliminate the fault to ensure the normal operation of the test. Other environmental test equipment will have other phenomena in use, it must be specific phenomena, specific analysis and exclusion.
The environmental testing equipment should also be regularly maintained. The condenser of the refrigeration system should be regularly cleaned. For the moving parts, lubrication should be performed according to the instructions, and the electrical control system should be regularly maintained and checked. These tasks are indispensable.

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