Metal Detection Sensor Proximity Switch SN04 Series — Reliable metal detection and easy integration for industrial automation A family of inductive proximity switches designed for metal inspection and position sensing. Choose from multiple SN04 variants and wiring/switching options to match your application: SN04N, SN04N2, SN04P, SN04P2, SN04D1, SN04D2, Y1 and Y2 models with NPN or PNP outputs and NC (normally closed) or NO (normally open) switching. Key benefits Noncontact metal detection: Detect metal parts without wear, reducing maintenance and downtime. Flexible integration: Available in NPN and PNP output types and NC/NO configurations to match PLCs, controllers and relay inputs. Multiple model options: SN04 family (including SN04N2) gives choice of wiring and switching behavior for different system requirements. Faster troubleshooting and installation: Standard proximity switch behavior simplifies wiring and commissioning. Features and key attributes Functionality: Inductive proximity sensing for reliable detection of metal targets and position confirmation. Models supported: SN04N, SN04N2, SN04P, SN04P2, SN04D1, SN04D2, Y1, Y2. Output types: NPN and PNP logic outputs to interface with common industrial controllers. Switching modes: Normally closed (NC) and normally open (NO) options for application flexibility. Application focus: Designed specifically for metal inspection, part counting, presence/absence sensing, and position detection in automated systems. Ease of use: Simple wiring and standard switch behavior make replacement and retrofitting straightforward. Durability: Intended for industrial environments where noncontact sensing improves component life compared with mechanical switches. Compatibility and integration Interfaces directly with PLCs, counters, relay inputs and discrete I/O on machine controllers using the chosen NPN or PNP output. Multiple switching options (NC/NO) allow matching sensor behavior to system logic and safety requirements. Suitable for retrofits and installations in automated metal handling, assembly and inspection equipment. Typical use cases 1) Conveyor part detection and counting Mount an SN04 proximity switch to detect passing metal components on a conveyor. Use the counting input on a PLC or counter with the appropriate NPN/PNP output and NO/NC wiring to register each part reliably without mechanical contact. 2) Position sensing on automated machinery Detect the presence or home position of metal fixtures, tooling or actuators. The SN04 models provide repeatable switching to trigger process steps or safety interlocks. 3) Quality inspection and metal detection Integrate the SN04 series into inspection stations to confirm metal components are present or correctly oriented before downstream assembly or packaging. Why choose this SN04 proximity switch family Versatile model and wiring options reduce the need for adapters or rewiring when integrating into different control systems. Noncontact operation increases reliability and reduces maintenance compared with mechanical switches. Clear selection between NPN/PNP and NC/NO options allows direct compatibility with existing equipment logic. Ordering note Select the SN04 variant and wiring/switching type (for example SN04N2, SN04P, etc.) that matches your controller input and desired switching behavior (NPN or PNP, NC or NO). For metal inspection and automated sensing tasks that require dependable noncontact detection and flexible integration, the SN04 series proximity switches deliver practical, easytoinstall solutions.