Metal Detection Proximity Switches — SN04 Series (SN04N, SN04N2, SN04P, SN04P2, SN04D1, SN04D2, SN04Y1, SN04Y2) Key benefits Reliable metal detection: Designed to detect ferrous and nonferrous metal targets for inspection and presence sensing. Flexible output options: Available in NPN and PNP output types and in Normally Open (NO) or Normally Closed (NC) configurations to suit different control systems. Easy integration: Compatible with common industrial controllers and PLC inputs that accept NPN/PNP switching signals. Multiple model variants: Choose the specific SN04 model that matches your wiring and switching needs without changing sensor mounting or target setup. What this sensor solves Eliminates missed metal parts and improves quality control by providing a dedicated proximity switch for metal inspection. Simplifies wiring choices by offering both NPN and PNP logic options and NO/NC contact behavior to match your existing control architecture. Reduces setup time and downtime by providing a standard sensor family with consistent performance characteristics across model variants. Key attributes Functionality: Inductive proximity switch for metal detection and presence sensing. Models included: SN04N, SN04N2, SN04P, SN04P2, SN04D1, SN04D2, SN04Y1, SN04Y2. Output types: NPN and PNP options available across the SN04 series. Contact behavior: Normally Closed (NC) and Normally Open (NO) configurations provided. Compatibility: Integrates with PLCs, relays, counters, and other industrial control devices that accept NPN/PNP proximity inputs. Performance: Designed for consistent, repeatable switching behavior suitable for inspection and automation tasks. (See modelspecific datasheets for detailed electrical and switching characteristics.) Userfriendly highlights Select the model with the output type and contact logic you need without redesigning the control system. Consistent family design makes replacement and stocking straightforward. Suitable for automated inspection lines, part detection stations, and machine sensing roles. Typical applications Conveyor part detection and rejection: Detect metal components as they pass conveyors to trigger sorting, counting, or rejection. Presence/position sensing in assembly: Verify that metal parts are present and correctly positioned before downstream operations such as welding, pressing, or fastening. Machine safety and interlocks: Use as a reliable proximity switch to confirm the state of metal guards, doors, or movable parts in safety and control circuits. Ordering and selection tips Match the SN04 variant to your controller logic: choose NPN for sinking inputs and PNP for sourcing inputs. Confirm whether Normally Open (NO) or Normally Closed (NC) behavior is required for your control logic or safety scheme. Refer to the specific model datasheet for electrical ratings, wiring diagrams, and any environmental or mounting details before installation. Practical installation notes Ensure correct wiring for NPN or PNP output to avoid improper logic signals to your controller. Use the same family of SN04 sensors for consistent mounting and easier spare parts management. For precise detection requirements, review the model datasheet for recommended target types and setup guidance. Models and wiring options at a glance SN04N, SN04N2: NPN output variants. SN04P, SN04P2: PNP output variants. SN04D1, SN04D2, SN04Y1, SN04Y2: Additional SN04 family variants with specific wiring or switching characteristics. Available contact modes: NC and NO options to match system requirements. For complete electrical specifications, mounting dimensions, and model comparisons, refer to the SN04 series datasheets or contact your supplier with the exact model number (for example, SN04P2) to ensure you receive the correct variant for your application.