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The core advantage of digital high-frequency eddy current testing systems lies in their efficiency and precision; they enable the assessment of the health status of furnace tubes without the need to shut down the furnace or remove the tubes, making them particularly suitable for inspecting high-temperature and high-pressure equipment such as methane-to-hydrogen conversion furnaces during operation. Compared to traditional inspection methods, its key advantages include high inspection efficiency: each furnace tube can be scanned within 2 minutes, and the comprehensive inspection of hundreds of tubes can be completed within 2 days, thereby significantly reducing the maintenance cycle. High sensitivity: It can detect internal wall cracks as small as 0.3 mm as well as early stages of creep damage, far exceeding the resolution capabilities of manual visual inspection or conventional ultrasonic testing. Strong data visualization: The system automatically generates colored defect maps, making the location, depth, and progression of cracks clear at a glance; it also supports C-scan imaging and AI-assisted analysis. Contactless and non-shutdown operation: Without the need for disassembly, cleaning, or shutdown, the probe can be placed directly against the pipe wall for sliding inspection, thereby reducing production downtime losses. AI-powered intelligent analysis: AI algorithms are used to analyze signal trends, which not only helps determine whether a replacement is necessary but also predicts the remaining lifespan, thereby facilitating the development of scientific maintenance plans. Adaptability to complex materials: It has strong penetration capability for materials that are difficult to inspect, such as austenitic stainless steel, effectively overcoming issues like poor ultrasound coupling and the ability of endoscopes to only visualize the surface. Easy to operate: The entire process can be completed by 1-2 people; the equipment is lightweight, allowing for quick deployment on-site. Furthermore, modern systems such as LEOSCAN or the German Romanelotest PL600 feature modular and automated integration; they can be used in conjunction with robotic scanning devices for the high-precision inspection of complex components like aircraft engine disks and high-pressure compressors, thereby significantly reducing human error.