In the maintenance of high and low temperature aging box, the condensing fan should be checked and repaired regularly, and the condenser should be frequently decontaminated and dust removed, and the cabinet should be dried after cleaning to keep the cabinet dry. In addition, if the uniformity is large, it is likely to be due to uneven heat transfer and poor sealing of the box wall. 1. Daily maintenance of high and low temperature aging box 1. The good temperature value of high and low temperature aging box is 8℃-23℃. For laboratories that do not have this condition, appropriate air conditioners or cooling towers should be equipped; 2. When opening and closing the door or taking the test object from the box, do not make it touch the door seal; 3. When the compressor adopts air-cooled cooling method, the condensing fan should be regularly checked and repaired, and the condenser should be decontaminated and dust removed; 4. Due to the different levels of cleanliness of the samples, a large amount of dust and other small particles will accumulate on the evaporator under the action of forced air circulation, so we need to clean the evaporator regularly; 5. Humidifier fouling can easily cause dry burning of the humidifier, which may burn the humidifier, so it is necessary to clean the waterway with the humidifier regularly; 6. At the end of each experiment, it is recommended to clean the test box with clean water to keep the equipment clean. The cabinet should be dried after cleaning to keep the cabinet dry; 7. Insist on setting the temperature near the ambient temperature at the end of each test, cut off the power after working for about 30 minutes, and wipe the inner wall of the working chamber. Second, the reason for the large uniformity of the high and low temperature aging box 1. The heat transfer of the box wall is uneven In the high and low temperature test environment, due to heat conduction, the heat loss of the high and low temperature aging box or the low temperature box is caused. In order to compensate for the heat loss, the supply air temperature difference will inevitably occur. The supply air temperature of the high and low temperature aging box is higher than the inside of the box. Working temperature, the air supply temperature of the low-temperature box is higher than the working temperature in the box. Because of a certain supply air temperature difference, the temperature in the working chamber is uneven. 2. Poor sealing The tightness of the box is not good. For example, air leakage in the door will affect the uniform temperature of the equipment working room. 3. Structure asymmetry The structure of the high and low temperature aging box has a great influence on the uniformity of the temperature in the test. Because this structure is difficult to be completely symmetrical, it has an adverse effect on temperature uniformity. The door is in the front, and the air-conditioning room is behind the cabinet. The structure has good left-right symmetry and can easily achieve the uniformity of the left-right temperature. 4. The sample volume is too large If the temperature measurement deviation requires the sample to be placed in the working room, when the sample volume is too large, or the placement method is improper, the air convection will be blocked, and it will also cause a large temperature deviation. [url=https://www.qinsun-lab.com/256.html]UV Carbon Arc weather Meter[/url] [url=https://www.qinsun-lab.com/257.html]UV Aging Test Chamber[/url] [url=https://www.qinsun-lab.com/1202.html]Ozone test chamber[/url]