The UA18CSD03AGM1TI is a diffuse ultrasonic sensor with analogue output designed for precise distance measurement and level control applications. It features a rated operating distance of 40–300 mm with a blind zone of =40 mm, delivering 3 mm resolution and 1% linearity accuracy with 1% repeatability. The sensor operates on 10–30 VDC power supply and outputs 4–20 mA analogue signal, with integrated short-circuit and overvoltage protection. Its M18 cylindrical PBT housing with M12 4-pin connector provides IP67 protection, temperature compensation from -20°C to +60°C, and a ±7° beam angle. The microprocessor-controlled digital filtering ensures immunity to electromagnetic interference, making it ideal for industrial distance measurement, level measurement, diameter measurement, and loop control systems.