A controller that minimizes damage caused by leakages. [Features] ·High sensitivity allows high-accuracy level control to prevent cleaning irregularities. ·K7L-AT50□ / AT50D□□: The inter-electrode resistance detection system realizes stable detection of everything from impedance liquids to general water. ·K7L-U□ / UD□□: The monitoring area has been greatly increased, equipped with a disconnection detection function which helps ensure peace of mind when wiring over long distances. [Applications] ·K7L-AT50□ / AT50D□□: Can be used widely in everything from semiconductor manufacturing equipment to food processing machines. ·K7L-U□ / UD□□: Ideal for long-distance, wide-range leak detection.