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The Autonics PR12-4DP is an M12 unshielded PNP normally open DC 3-wire inductive proximity switch belonging to the PR series. Specifically designed for non-contact detection of metallic objects, it features strong anti-interference capability, a comprehensive protection circuit, and easy installation and maintenance. It is widely used in industrial automated production lines, machine tools, packaging machinery and other fields.
- Parâmetros técnicos principais
| Parâmetro | Value | Remarks |
| Product Model | PR12-4DP | M12 unshielded type of PR series |
| Sensor Type | Inductive Proximity Switch | Detects metallic objects only |
| Sensing Distance | 4mm±10% | Standard test object: 12×12×1mm iron block |
| Mounting Type | Unshielded (Exposed) | Allows the sensing surface to protrude from metal mounting plate |
| Output Type | PNP Normally Open (NÃO) | 3-wire DC output |
| Tensão operacional | 10-30CCV | Typical value: 12-24CCV |
| Rated Output Current | 200mA | Overcurrent protection value to prevent damage from overload |
| Current Consumption | ≤10mA | Low quiescent power consumption for energy efficiency |
| Response Frequency | 500Hz | Fast response, suitable for high-speed detection |
| Residual Voltage | ≤1.5V | Ensures reliable signal recognition by controllers such as PLC |
| Classe de Proteção | IP67 | Dust and water proof, adaptable to harsh industrial environments |
| Temperatura operacional | -25°C~+70°C | Wide temperature design for different working conditions |
| Temperatura de armazenamento | -30°C~+80°C | Broad conditions for transportation and storage |
| Cable Length | 2m | Standard PVC cable, extendable to 10m (voltage drop to be noted) |
| Thread Specification | M12×1 | Standard cylindrical mounting thread |
| Certification Standards | CE, CCC, EAC, RoHS, UKCA | Compliant with international safety and environmental standards |
- Product Features and Advantages
- Excellent Anti-interference Performance: Adopts Autonics self-developed dedicated IC, which significantly enhances anti-electromagnetic interference capability and adapts to the complex electromagnetic environment of industrial sites.
- Multi-protection Circuit: Built-in reverse power protection, surge protection and overcurrent protection to improve equipment reliability and service life.
- Long Service Life Design: No mechanical contacts, theoretical service life of more than 10⁸ operations, far exceeding mechanical switches.
- Flexible Installation: Unshielded design allows the sensing surface to protrude from the metal mounting plate, saving installation space.
- Clear Status Indication: Built-in LED indicators display power (verde) and output (orange) status in real time.
- High Interchangeability: Standard M12 size, can directly replace products of the same specification from other brands.
- Cenários de aplicação
| Application Field | Typical Application | Advantage Embodiment |
| Linhas de produção automatizadas | Part counting, position locating, in-place detection | Non-contact detection, no wear, improved production line efficiency |
| Machine Tools | Tool position detection, worktable positioning, safety door monitoring | Fast response, resistant to oil and coolant interference |
| Packaging Machinery | Packaging material in-place detection, sealing position control | IP67 protection, adaptable to humid and dusty environments |
| Conveying Systems | Material presence/absence detection, conveying speed monitoring | Long-distance detection, stable and reliable |
| Automotive Manufacturing | Body position detection, component assembly positioning | Resistant to welding spark interference, adaptável a ambientes de alta temperatura |
| Warehousing and Logistics | Shelf position detection, stacker positioning | Low power consumption, suitable for long-term continuous operation |
- Guia de instalação e fiação
4.1 Pontos-chave de instalação
| Step | Operation Instructions | Notas |
| Installation Preparation | Select a flat metal surface and reserve sufficient installation space | For unshielded mounting, the sensing surface must protrude ≥5mm from the metal plate |
| Thread Fixation | Tighten with an M12 wrench, torque ≤5N·m | Avoid excessive force to prevent thread or sensor damage |
| Spacing Requirement | Spacing ≥8mm when multiple sensors are installed side by side | Prevent mutual interference from affecting detection accuracy |
| Sensing Distance Setting | The actual sensing distance is recommended to be within 70% do valor nominal (≤2.8mm) | Ensure stable detection and avoid misoperation |
| Cable Routing | Avoid parallel laying with power lines, keep a distance of ≥30cm when crossing | Reduce electromagnetic interference, shielded cable is recommended |
4.2 Método de fiação (DC 3-wire)
| Color | Função | Wiring Instructions |
| Brown | V+ | Connect to 10-30VDC positive pole |
| Blue | V- | Connect to power negative pole/common terminal |
| Black | Output (NÃO) | PNP normally open signal, outputs high level (close to power voltage) when a metallic object is detected |
- Troubleshooting and Maintenance
| Fenômeno de falha | Possíveis causas | Troubleshooting Methods |
| LED indicators not lit | 1. Poor power connection or abnormal voltage | 1. Check power voltage (10-30CCV) |
| 2. Cable breakage or poor contact | 2. Check cable connections and replace if necessary | |
| 3. Reverse power polarity | 3. Confirm brown wire to positive pole and blue wire to negative pole | |
| No output signal | 1. Sensing distance exceeds the rated value | 1. Adjust installation distance to ≤2.8mm |
| 2. Detected object is non-conductive metal | 2. Replace with ferromagnetic metal test object | |
| 3. Excessive load in the output circuit | 3. Ensure load current ≤200mA | |
| 4. Sensor damage | 4. Replace with a new sensor | |
| Frequent misoperation | 1. Sensing distance too close | 1. Appropriately increase the sensing distance |
| 2. Severe electromagnetic interference | 2. Keep away from interference sources such as inverters and motors | |
| 3. Large power supply fluctuation | 3. Install a power filter | |
| 4. Ambient temperature out of range | 4. Improve heat dissipation or thermal insulation conditions | |
| Unstable output signal | 1. Uneven or shaking detected object surface | 1. Adjust the position of the detected object or add guides |
| 2. Loose sensor | 2. Retighten the sensor | |
| 3. Poor cable contact | 3. Check cable connections and replace if necessary |
- Same Series Product Replacement Comparison Table
For Autonics PR series M12 size products, different output types and mounting types can be selected according to requirements:
| Modelo | Output Type | Mounting Type | Applicable Scenario | Replacement Description |
| PR12-4DN | NPN Normally Open | Unshielded | PLC input with sinking (NPN) interface | Only different in output type from PR12-4DP, other parameters are consistent |
| PR12-4DP2 | PNP Normally Closed | Unshielded | Detection occasions requiring normally closed signals | Opposite output logic, other parameters are consistent |
| PR12-4DN2 | NPN Normally Closed | Unshielded | Sinking interface + normally closed signal requirement | Both output type and logic are opposite |
| PRD12-4DP | PNP Normally Open | Shielded (Flush-mount) | Sensing surface needs to be flush with the metal plate for installation | Different mounting type, same sensing distance |
| PRDW12-4DP | PNP Normally Open | Shielded + Connector | Occasions requiring frequent disassembly and maintenance | With M12 connector for easy replacement |
- Cross-brand Model Comparison Table (Core Parameter Matching)
| Brand | Modelo | Core Parameters | Replacement Notes |
| Schneider | XS112BLPAM12 | PNP NO, 4milímetros, M12, unshielded, IP67 | Fully matched in output type and sensing distance, can be directly interchanged |
| Siemens | 3RG4012-0AG30 | PNP NO, 4milímetros, M12, unshielded, IP67 | Response frequency 400Hz (slightly lower than Autonics 500Hz), suitable for general applications |
| Omron | E2E-X4MD1-Z | PNP NO, 4milímetros, M12, unshielded, IP67 | Operating voltage 12-24VDC (narrower range), pay attention to power matching |
| Pepperl+Fuchs | NJ1.5-8GM-N | PNP NO, 4milímetros, M12, unshielded, IP67 | Sensing distance 1.5mm (curto), need to adjust installation position |
| Turck | NI12U-EM40WD-AP6X | PNP NO, 4milímetros, M12, unshielded, IP67 | Cable length 3m (1m longer than Autonics), installation space to be adapted |
| Domestic Alternative | Delixi CDJ12-4DP | PNP NO, 4milímetros, M12, unshielded, IP67 | High cost performance, consistent parameters, suitable for projects with limited budget |
- Selection and Procurement Suggestions
- Output Type Selection: Select PNP or NPN output according to the input type of the controller (PLC/DCS). PR12-4DP is PNP normally open, suitable for sourcing input systems.
- Mounting Type Determination: Unshielded type (PR12 series) is suitable for space-constrained occasions, while shielded type (PRD12 series) is suitable for scenarios where the sensing surface needs flush mounting.
- Sensing Distance Setting: Em aplicações práticas, it is recommended to use within 70% of the rated sensing distance (≤2.8mm) to ensure detection stability and reliability.
- Load Matching: Ensure the load current ≤200mA; a relay is required to expand the output capacity if the load exceeds the limit.
- Cable Length: The standard 2m cable can be extended to 10m, but voltage drop must be noted. It is recommended to increase the supply voltage by 1V for every 5m extension.
- Procurement Channel: Choose authorized Autonics distributors to ensure genuine original products and enjoy 12-month warranty service.
- Key Notes for Replacement and Selection
- Parameter Matching Priority
Must ensure: Sensing distance, output type (PNP/NPN), mounting type (shielded/unshielded), operating voltage are consistent with the original equipment.
Key matching: Thread specification (M12), protection class (IP67), output current (≥200mA).
Functional matching: Response frequency (≥500Hz), protection circuit type.
- Compatibilidade de instalação
For unshielded mounting, the sensing surface must protrude ≥5mm from the metal mounting plate, otherwise the sensing distance will be affected.
Shielded type can be fully embedded in the metal mounting plate without affecting detection performance.
- Wiring Notes
PNP output sensors must be connected to the sourcing input interface of the PLC.
Ensure correct power polarity during wiring to avoid damage to the sensor and controller.
- Adaptabilidade Ambiental
For high-temperature environments (>60°C), it is recommended to select high-temperature resistant models or add heat dissipation measures.
For humid environments, ensure the cable joints are well sealed to prevent water ingress.
- Recommended Priority for Brand Replacement
| Priority | Brand | Modelo | Recommended Reason |
| 1 | Autonics | PR12-4DN/PRD12-4DP | Same brand replacement, fully consistent parameters, optimal compatibility |
| 2 | Schneider | XS112BLPAM12 | Internationally renowned brand, reliable quality, comprehensive technical support |
| 3 | Omron | E2E-X4MD1-Z | Fast response speed, strong anti-interference capability, suitable for precision detection |
| 4 | Delixi/Chint | CDJ12-4DP/NJ12-4DP | High cost performance, first choice for domestic replacement, adaptable to domestic projects |
| NAME | TYPE | BRAND |
| Inductive Proximity Sensor | PR12-4DP | Autonics/72CNY |
| Proximity Sensor PR18 | PR18-8DN | Autonics/72CNY |
| Timer H3CR-A8 + Socket | H3CR-A8 | Dappra |
| Timer H3CR-A8 + Socket | H3CR-A8 | Dappra |
| Proximity Sensor | SN04-N | Dappra |
| Power Relay 110V | LY2N-J | Dappra |
| Relay 12A | RXM2AB2P7 | Dappra |
| Sensor M18 | D18-3A30N1 | Dappra |
| Sensor SN04-N | SN04-N | Dappra |
| Relay 4PDT 230VAC | RXM4AB2P7 | Dappra |
| Relay 4PDT 24VDC | RXM4AB2BD | Dappra |
| Sensor SN04-N | SN04-N | Dappra |
| Relay Socket | PF083A | Generic |
| Relay Socket 8 Pin | PTF08A | Generic |
| Relay Socket | PF083A PL35 | Generic |
| Relay Counter Digital | DH48S-S | Omron |
| Photoelectric Sensor | E3Z-D62 | Omron |
| Proximity Sensor | E2E-X2D1-N | Omron |
| Timer + Socket | H3CR-A8 DC24V | Omron |
| Power Relay | G2R-1A-E 24VDC | Omron |
| Photoelectric Sensor | E3Z-D61 | Omron |
| Sensor R4M1 | E3JK-R4M1 | Omron |
| Sensor R4M2 | E3JK-R4M2 | Omron |
| Proximity Sensor | TL-Q5MC1 | Omron |
| Timer DH48S-2Z | DH48S-2Z | Omron |
| Sensor Proximity NPN | PSN17-5DN | Autonics |
| Jumper Bar Terminal Block | FBS10-5 | Phoenix Contact |
| M12 Mounting Bracket | PS59 | Generic |
| Timer Relay 11 Pin | H3CR-A 220V | Omron |
| General Purpose Power Relay | G7L-2A-TUB | Omron |
| Sensor Proximity NPN M18 8mm | PRL18-8DN | Autonics |
| Control Relay DPDT 8 Pin | LY2N-J DC 12V 10A | DAPPRA |
| Terminal Block Fixed Bridge Jumper | UK5N | Generic (UK Type) |
| Power Relay PCB SPDT 16A | G2R-1-E DC24V | Omron |
| Sensor Fotolistrik M18 | CDR-30X | FOTEK |
| Sensor Proximity Kapasitif M18 | CR18-8DN | Autonics |
| Modul Relay PLC 16 Channel | G2R-1-E 16A 24V DC PNP | OMRON (Relé) / Generic (Modul) |
| Sensor Proximity Induktif NPN NO | LJ18A3-8-Z/BX | Generic |
| Sensor Proximity Induktif PNP NO M12 | LJ12A3-4-Z/BY M12 | Generic |
| Jumper Bar Terminal Block | FBS 2-5 | Phoenix Contact (ID) |
| Timer Relay 4PDT 8 Pin | H3Y-4 AC220V 5A 60S | Omron (ID) / Generic |
| Sensor Fotolistrik Reflektif | BRP100-DDT | Autonics |
| Sensor Proximity NPN M18 5mm | PR18-5DN | Autonics |
| Sensor Fotolistrik NPN | BR100-DDT 12-24 CCV | Autonics |
| Sensor Proximity NPN M8 1.5mm | PR08-1.5DN | Autonics |
