【Haichuan’s Insights from Others】Inventing a plug-and-play split sampling port device to improve the accuracy of testing and sampling

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A plug-and-play split sampling port device invented by employees of the Guangzhou Petrochemical Inspection Center has been granted a utility model patent by the Intellectual Property Office. This device is suitable for analyzing the sulfur and chlorine content in various liquid and gaseous samples from the petrochemical industry. It features safe and fast operation, precise positioning and orientation of the sampling needle during sample introduction, resulting in more accurate analysis results. The microcoulometry method is widely used in the petrochemical industry to determine the contents of sulfur and chlorine. When sampling with a syringe, the needle pierces the sampling pad, and after repeated use the pad tends to develop holes and leak air, resulting in lower measurement values. At the same time, due to the excessively high temperature of the quartz tube, when replacing the rubber stopper in such instruments, operators need to wear gloves and use tweezers, which poses certain safety risks. To overcome this technical challenge, the center assembled its key technical experts to focus on improving the injection port. Through exploration, they proposed improvement measures—replacing the original integrated injection port with a detachable, split-type injection port. Practice has shown that using the improved injection port for analysis operations allows the syringe needle to avoid contacting the injection pad and the coiled tube inside the quartz tube, resulting in better reproducibility of the analysis results. Since the new sampling port is located far away from the high-temperature furnace of the microcoulometer, under the high-temperature conditions in which the instrument operates normally, replacing the rubber stopper is safer and simpler to perform.