Turck NI4-DSU35-2ADZ30X2-B3151 Inductive Switch

The TURCK NI4-DSU35-2ADZ30X2-B3151 Inductive Switch is a dual-inductive sensor-based rotary actuator position feedback device that provides wear-free open/closed state detection through two normally open outputs for valve monitoring. Commonly installed on pneumatic actuators and quarter-turn valves—including butterfly and ball valves—it's used in chemical processing skids, water treatment equipment, and industrial fluid handling systems requiring reliable rotary position indication and end-of-travel feedback. Key specs include a DSU35 rectangular housing in PP-GF30-V0 thermoplastic, a 4 mm sensing distance, IP67 protection, operating temperature from -25°C to +70°C, and an operating voltage of 20-250 VAC or 10-300 VDC with 4-wire AC/DC configuration. The unit provides a rated output current of 400 mA AC or 300 mA DC, uses a 1/2" male connector (B3151), and features 2 × NO contacts with a 2-wire configuration. It also offers short-circuit and reverse polarity protection, wear-free operation, two LED indicators for status, and a switching frequency of 20 Hz for reliable valve position monitoring in industrial automation. Common replacements include TURCK NI4-DSU35-2ADZ30X2-B1151, NI4-DSU35TC-2ADZ30X2, and NI4-DSU35-2AP4X2-H1141.