The TURCK BC20-K40SR-FZ3X2 is a precision-engineered capacitive proximity sensor that offers reliable and contactless detection of a wide range of materials including solids, powders, and liquids. Designed with a slim rectangular housing, this model provides a long sensing range of up to 20 mm and is perfectly suited for installation in confined or flat-mount environments. It operates using an NPN normally open output, making it compatible with sinking input configurations in PLCs and automation systems. The sensor is highly resistant to dust, moisture, and vibration, and features an IP67-rated housing for harsh industrial environments such as food processing, packaging, and material handling. The BC20-K40SR-FZ3X2 includes LED status indication for easy diagnostics, and its compact body allows for flush integration with flat surfaces such as hoppers, tanks, conveyors, or panel enclosures. Key Features: • Capacitive technology – detects solids, liquids, granules • Long sensing distance: 20 mm (flush mount) • Output type: NPN, normally open (NO) • Rectangular housing – space-saving and surface-mount friendly • Supply voltage: 10–30 VDC • LED status indicator for signal feedback • IP67 protection – resistant to water, dust, and shock • Short-circuit, reverse polarity, and overload protection • Excellent for tanks, bins, packaging lines, and conveyor systems