ST 521 KH is a compact industrial flow sensor engineered for accurate monitoring of water, oil, air, and liquid media in high-temperature processing systems. Built with a corrosion-resistant AISI 316 Ti stainless steel housing, this G1/2 screw-in sensor supports dependable flow detection in production plants, thermal processing equipment, cooling circuits, lubrication systems, and industrial automation lines. Its rugged construction and 31 mm sensor length make it suitable for demanding operating environments where reliable media monitoring is essential.
Key Features
The sensor supports flow detection ranges from 1 to 150 cm/s for water, 3 to 300 cm/s for oil, and 1 to 40 m/s for air and gaseous media. It withstands medium temperatures up to 160 °C in fluids and provides IP67 protection for secure industrial operation. The integrated 2 m FEP cable ensures dependable electrical connection in heat-intensive applications. The sensor is designed for installation in T-piece connectors or welding sleeves and operates with SKM 420 and SKZ 400 amplifiers.
Applications
ST 521 KH is widely used in industrial flow monitoring systems, machine cooling units, hydraulic circuits, lubrication lines, heat exchange systems, process automation equipment, and chemical processing plants. It helps prevent dry running, unstable flow conditions, overheating, and unexpected equipment downtime by delivering stable and responsive flow measurement.
Design and Functionality
The stainless steel sensor housing provides long-term resistance against corrosion, aggressive media, and demanding environmental conditions. Its compact immersion depth allows installation in restricted pipe systems while maintaining accurate sensing performance. With a typical start-up time of 8 seconds and fast reaction response, the sensor supports continuous process reliability in dynamic industrial environments.
Operational Advantages
The ST 521 KH improves process efficiency by maintaining consistent media flow detection in both liquid and gaseous systems. Its high compressive strength of 60 bar and strong thermal resistance support continuous operation in industrial production environments. The sensor also reduces maintenance requirements, minimizes process interruptions, and enhances operational safety across automated manufacturing systems.
