Factors affecting the life of UV lamps

(1) Design life. The following factors have a significant influence on the life of UV lamps. A. Wall load. The load lamp has a low lifetime, the same working current, and a small lamp diameter has a low lifetime. B, working voltage. The lamp voltage is high and the service life is low. C, power density. High power density lamp life is low.

(2) Materials. The quality of the tube wall quartz glass has a great influence on lamp life. Good quartz glass has high purity, no bubbles inside, and a smooth surface. Because the wall temperature is generally above 600°C, if the purity is not enough, there will be gasification of the glass surface, resulting in a lot of tiny pits, affecting the UV radiation out of the wall. The domestic quartz tube can be visually observed with bubbles in the wall of the tube, affecting the UV radiation out of the tube wall, and the bubbles will form a high-pressure air mass explosion at high temperatures to rupture the tube wall. The electrode material is generally a layer of zirconium oxide or other cathode emitting material sintered on the surface of the tungsten wire. The aging resistance and temperature resistance of tungsten and cathode materials directly affect the electrode life.

(3) production process. This factor is the most important factor restricting the quality of domestic UV lamps. The main processes affecting the lamp life are: cleaning the inner wall of the lamp, vacuum, purity and injection of mercury, argon charge and discharge, electrode lead welding, and cathode material sintering. The entire process should be carried out in a high-level cleaning place; cathode material sintering, welding, sealing, etc. should be completed under vacuum conditions. The current domestic production of UV lamp manufacturers do not have these conditions, greatly affecting lamp life.

(4) How to use it. Improper use of the lamp will greatly reduce lamp life. Use the following points should be noted:

A. Transformer parameters and lamp parameters must be matched. Voltage and current must not exceed design specifications. In particular, the starting voltage should not be too high, generally not exceeding 40% of the design operating voltage.

B. Keep the wall clean, especially remove oil and dust. Because these substances will penetrate into the lamp tube on the surface of the high-temperature tube, blocking the ultraviolet radiation.

C. Ventilation is scientific and reasonable. The amount of ventilation should be calculated scientifically. The purpose is to suck the heat generated by the UV lamp out of the lamp and allow the lamp to operate in a normal temperature environment. The lower the temperature, the better. Ventilation keeps the lamp head temperature below 150°C. In addition, with a reasonable amount of air, the temperature of the line, sensor, and case in the light box is kept below 90°C.