The maintenance of the UV radiation aging test chamber should follow the principle of "prevention first, regular inspection", clean the equipment to ensure the operating environment, replace the lamp tube to ensure stable testing conditions, and check the circuit to eliminate safety hazards. Only by implementing the three major maintenance points in place can we effectively reduce equipment failure rates, extend service life, provide accurate and reliable testing environments for material aging tests, and assist in quality control in the fields of scientific research and production.
1、 Cleaning: Ensuring the basic operating environment of equipment
Cleaning work needs to be carried out regularly, with a focus on components that affect radiation uniformity and equipment heat dissipation. When cleaning the inside of the test chamber, the power should be cut off first. After the equipment cools down, a soft dust-free cloth dipped in neutral cleaning agent (such as alcohol diluent) should be used to wipe the sample holder, inner wall, and reflector plate to avoid damaging the coating with corrosive solvents. Special attention should be paid to cleaning the dust and oil stains on the surface of the ultraviolet lamp tube. Dust accumulation can cause a decrease in radiation intensity, so it is necessary to gently wipe it with a dry cloth every two weeks. Water systems such as water tanks and pipes are prone to scale buildup, so they need to be cleaned with citric acid solution every month to prevent blockages and affect the condensation effect. After cleaning, they should be rinsed with clean water to prevent residual solution from corroding the equipment.
2、 Lamp replacement: Ensure that the radiation intensity meets the standard
The ultraviolet lamp tube is a core consumable component, with a typical service life of 1600-2000 hours, and needs to be replaced regularly according to the duration of use. Before replacement, it is necessary to confirm that the equipment is powered off. After the lamp tube cools down, open the top cover of the equipment, loosen the fixing buckles at both ends of the lamp tube, and avoid direct contact with the surface of the lamp tube when removing the old lamp tube to prevent sweat residue from affecting its service life. When installing a new lamp tube, it is necessary to check the lamp tube model (such as UV-A, UV-B) to match the equipment, ensure that the electrodes at both ends of the lamp tube are in close contact with the socket, close the top cover after installation, and check whether the lamp tube is in a horizontal state before powering on to avoid uneven radiation caused by installation tilt. After replacement, radiation intensity calibration is required. A professional detector is used to measure the intensity at different positions inside the test chamber to ensure that it meets the test standards. If the deviation exceeds ± 5%, the position of the lamp tube needs to be adjusted or the detector needs to be replaced.
3、 Circuit inspection: eliminate safety hazards
Circuit system inspection should be conducted once a month, with a focus on identifying issues such as aging circuits and poor contacts. Firstly, check whether the power supply incoming line and grounding wire are firm, whether there is any damage or oxidation, and the grounding wire resistance should be less than 4 Ω to ensure electrical safety. Next, open the electrical control cabinet and blow away the internal dust with dry compressed air to avoid dust accumulation and short circuits. Check whether the contacts of the contactor and relay are burned. If the contacts turn black or uneven, replace the components in a timely manner. The sensor of the temperature control system is a key component, and it is necessary to check whether the sensor wiring is loose. Use a multimeter to measure its resistance value and compare it with standard parameters to determine if it is normal. If the sensor fails, it will cause temperature control deviation and needs to be replaced immediately with a sensor of the same model. In addition, regularly check the overload protection device of the equipment, simulate overload situations to test whether the protection function is triggered, and ensure that the equipment can automatically power off in case of abnormalities.