How is the concentration of the ozone aging test box adjusted? How is the airflow of the ozone aging test box adjusted? Let's take a look at it together. See how the ozone test chamber concentration and airflow are adjusted.
The ozone test chamber can use the method of automatically adjusting the ozone concentration. When an ultraviolet light source is used, the ozone concentration can be adjusted by adjusting the voltage and gas flow rate applied to the lamp 7 or shielding the lamp part exposed to the flowing air; when When using a silent discharge tube, the ozone concentration can be adjusted by adjusting the voltage applied to the generator, the electrode size, the oxygen flow rate, or the reduced air flow rate. These adjustment methods should keep the ozone concentration within the tolerance range specified in 8.1. In addition, when opening the test box to put people or check the samples, the ozone concentration should be restored to the concentration specified in the test within 30 minutes. In any case, the ozone concentration entering the ozone box must not exceed the concentration specified in the test.
The test chamber should have a device to adjust the average flow rate of ozonized air to not less than 8 mm / s, preferably between 12 mm / s and 16 mm / s. The ozonized air flow rate can be calculated by dividing the measured gas flow rate in the box by the effective cross-sectional area of ​​the box perpendicular to the air flow. For comparative tests, the change in flow rate must not exceed ± 10%. The gas flow rate is the volume through which ozonized air passes per unit time. In order to prevent the ozone concentration in the box from being naturally reduced by the dry ozone being consumed by the sample, the gas flow rate should be large enough. The ozone depletion rate varies with the rubber used, the test conditions, and other test details. It is generally recommended that the ratio of the exposed surface area of ​​the sample to the gas flow rate does not exceed 12 s / m, but this value is not always low enough. When in doubt, the impact of consumption must be verified by testing, and the surface area of ​​the sample can be reduced if necessary. The gas entering the test chamber can be mixed with the gas in the chamber with a diffusion membrane or equivalent device. If high-speed flow rate is required, a fan can be placed in the box to increase the ozonated air flow rate to 600 mm / s ± 100 mm / s.
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