This paper presents a temperature measurement and online monitoring system for high-temperature metallurgical furnace water jackets, addressing the inability of periodic infrared inspection to continuously acquire multipoint temperatures and the need to verify wireless access, point mapping, and historical-data completeness. Twelve K-type thermocouples are installed in four monitoring regions and connected to a server through LoRa temperature modules, bound gateways, and Modbus TCP. Configuration-based mapping associates communication channels with physical points, while the server provides categorized storage, real-time monitoring, historical queries, data export, and multi-rule alarms. All 11 server-side unit tests passed. In 1-h tests, two representative links achieved success rates of 99.969% and 100%, with mean response times of approximately 294 ms. Field data covered 157.13 h; valid-record rates were at least 99.761%, and pairwise correlations among thermocouples in one group ranged from 0.9956 to 0.9984. The results demonstrate continuous multipoint access, centralized storage, trend visualization, and historical traceability, providing a data basis for subsequent temperature early-warning modeling.

metallurgical furnace water jacket,temperature measurement,LoRa,online monitoring