Technology, temperature inside the box
During the irradiation phase or the stop-light phase, the temperature in the tank shall be controlled by the specified test procedure (A, B or C), and the relevant specification shall be +40 degrees or +55 degrees to be reached during the irradiation phase according to the intended use of the equipment or components. ;
2, air flow speed
In addition to affecting the temperature rise of the sample, in addition to affecting the temperature rise of the sample, there is even a significant error in the open thermopile that monitors the radiation intensity. Generally, the speed of 1 m/s causes the temperature rise of the thermopile to be reduced by more than 20%. It can be seen that the airflow speed should be monitored while the temperature (or) condition of the control box is effectively controlled, and the low speed of zui should be used as much as possible. In addition, when adjusting the temperature inside the tank, high-speed airflow can be avoided by heating or cooling the tank wall.
In the natural environment, the probability of a strong condition with strong solar radiation and zero wind speed is extremely small. Therefore, when it is necessary to assess the influence of different wind speeds on samples such as equipment or components, the relevant specifications should specify specific requirements;
3, surface pollution
Dust and other surface contaminants will severely alter the absorption characteristics of the surface of the object being illuminated. Unless otherwise specified, the sample shall be cleaned during the test, but when assessing the role of surface contaminants, the relevant specifications shall specify the necessary content such as surface treatment of the sample;
4, humidity
Under different humidity conditions, the photochemical degradation effects of various materials, paints, and plastics vary greatly, and their requirements for humidity conditions are different from each other. Therefore, specific humidity conditions are clearly defined by relevant regulations. For example, it is prescribed that the test procedure B is performed at a wet heat condition (40 degrees, relative humidity 93%) 4 hours from the beginning of each cycle.
5. Ozone and other polluting gases
The ozone generated by the box under the short-wave ultraviolet radiation of the light source can usually be discharged outside the test chamber by a radiation filter that corrects the spectral energy distribution. Since ozone and other polluting gases may affect the deterioration process of certain materials, unless the specification It is stipulated that these harmful gases must be discharged outside the box;
6, bracket and its installation
The thermal characteristics of the various supports and their installation will have a serious impact on the temperature rise of the test sample, which should be fully considered so that its heat transfer characteristics represent typical practical use. During the test, most of the samples are mounted on various elevated brackets or mats with specific specified thermal characteristics. The detailed requirements for the mats and their installation methods and sample placement shall be in accordance with the relevant regulations.
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