The Gestra LRR 1-40 is a versatile conductivity controller and limit switch designed for precise monitoring and control of water quality in industrial applications. Primarily used in steam boiler plants, it continuously measures the conductivity (TDS level) of boiler water to automatically manage continuous or intermittent blowdown, preventing scaling and corrosion. It can also be utilized for monitoring condensate return, feedwater, and cooling water systems. The unit features a clear 4-digit LED display showing values in µS/cm or ppm, intuitive push-button controls for easy parameter setting, and LED indicators for operational status. Housed in a compact enclosure for DIN rail mounting, the LRR 1-40 ensures reliable process control, enhances plant safety, and optimizes energy and water consumption.