Metallurgy presents some of the toughest conditions for level measurement: intense heat, abrasive dust, steam, slag buildup, and potentially explosive gases. An explosion-proof radar sensor meets these challenges with non-contact, maintenance-light operation. Using high-frequency 80 GHz technology, it produces a narrow beam that avoids vessel walls and penetrates dust and vapor better than lower-frequency devices. The sensor is housed in a robust Ex d or Ex ia enclosure, with stainless steel or PTFE process seals, purged cooling, and high-temperature flanges. It measures molten metal, slag, alloy silos, coal bunkers, flux hoppers, and ladles without touching the process. Because there are no moving parts, wear and clogging are minimized. Accurate readings improve safety, reduce manual dipping, and support stable furnace operation. Operators gain real-time data for charging, tapping, and slag control, while maintenance teams avoid frequent contact inspections. By combining robust sealing, advanced signal processing, and certified explosion protection, these sensors deliver repeatable measurements from cold raw-material silos to hot process vessels. For reliable installation, select the correct hazardous-area certification, keep the antenna away from turbulent charge streams, use a protective window or purge when condensation is heavy, and verify the dielectric constant of the measured material. Choose the right flange rating and temperature range, and protect cables from radiant heat. Regular window cleaning and echo-profile checks keep performance stable. In harsh metallurgical plants, an explosion-proof radar sensor is a dependable choice for continuous level control.