The Gestra NRS 2-3b is a high-integrity level switch designed for reliable monitoring of conductive liquid levels, primarily in steam boilers, condensate tanks, and feedwater tanks. It functions as a high-level alarm, preventing overfilling, or as a low-level limiter to protect against dry-firing. The switch operates on the conductivity measurement principle, utilizing a level electrode to detect the liquid’s presence. Featuring self-monitoring capabilities and a robust design, the NRS 2-3b ensures safe and efficient plant operation in demanding industrial applications, meeting stringent safety standards for boiler automation.