Water purity requirements for water-cooled xenon lamp aging test chamber
The use requirements of a water-cooled lightning lamp aging test chamber are much higher than those of an air-cooled lightning lamp weathering test chamber. A pure water machine is required, while the air-cooled lighting lamp weathering test chamber can be sprayed with tap water.
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How high is the water purity requirement for the water-cooled xenon lamp weathering test chamber? The water produced by the pure water machine is mainly used to cool the lamp tube. If the water quality is not good, scale will be produced, affecting the irradiance of the lamp tube.
1. Deionized water is required for lamp cooling water. Tap water cannot be used without authorization. The conductivity is strictly required to be below 5us/cm because the triggering of the xenon lamp generates a large current and high voltage. If high-conductivity water is used, the lamp tube will be damaged when triggered. The temperature of the water inlet must be below 35°C because a water temperature that is too high will also reduce the service life of the xenon lamp tube. Therefore, when using circulating water, a closed cold water system and filtration system are also required to ensure that the water quality is not polluted by cooling.
2. The water used for spraying and humidification of the water-cooled xenon lamp aging test chamber also needs to be distilled water. If ordinary tap water is used, a white substance will appear on the surface of the sample, and the purpose of irradiation cannot be achieved. This substance is called calcium-magnesium crystals produced after the impurities in the water evaporate. Therefore, distilled water is required to ensure the consistency of radiation and achieve the purpose of the test.