**Abstract**
With the continuous advancement of automation in industries such as petrochemical, steel, paper, food, and pharmaceuticals, the demand for skilled field instrument maintenance technicians has significantly increased. As equipment becomes more complex, the need for efficient and accurate troubleshooting has become critical to ensure safe operations and maintain production efficiency. To address this challenge, this paper shares practical on-site maintenance experiences gained through real-world applications. These insights aim to help maintenance personnel improve their technical skills, reduce downtime, and enhance overall operational performance. By providing a comprehensive overview of common issues and effective solutions, this article serves as a valuable reference for professionals working in industrial instrumentation. The content is designed to support both novice and experienced technicians in addressing daily maintenance challenges with greater confidence and efficiency.
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