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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.
- Parametri tecnici fondamentali
| Parametro | Valore | Osservazioni |
| 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 (NO) | 3-wire DC output |
| Operating Voltage | 10-30VDC | Valore tipico: 12-24VDC |
| 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 di protezione | IP67 | Dust and water proof, adaptable to harsh industrial environments |
| Operating Temperature | -25°C~+70°C | Wide temperature design for different working conditions |
| Storage Temperature | -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.
- Installazione flessibile: 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 (green) and output (orange) status in real time.
- High Interchangeability: Standard M12 size, can directly replace products of the same specification from other brands.
- Scenari applicativi
| Campo di applicazione | Typical Application | Advantage Embodiment |
| Automated Production Lines | 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, adaptable to high-temperature environments |
| Warehousing and Logistics | Shelf position detection, stacker positioning | Low power consumption, suitable for long-term continuous operation |
- Installation and Wiring Guide
4.1 Punti chiave dell'installazione
| Fare un passo | Operation Instructions | Note |
| 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% of the rated value (≤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 Metodo di cablaggio (DC 3-wire)
| Color | Funzione | Wiring Instructions |
| Marrone | V+ | Connect to 10-30VDC positive pole |
| Blu | V- | Connect to power negative pole/common terminal |
| Black | Output (NO) | PNP normally open signal, outputs high level (close to power voltage) when a metallic object is detected |
- Troubleshooting and Maintenance
| Fenomeno di guasto | Possibili cause | Troubleshooting Methods |
| LED indicators not lit | 1. Poor power connection or abnormal voltage | 1. Check power voltage (10-30VDC) |
| 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:
| Modello | 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)
| Marca | Modello | Parametri fondamentali | Replacement Notes |
| Schneider | XS112BLPAM12 | PNP NO, 4mm, M12, unshielded, IP67 | Fully matched in output type and sensing distance, can be directly interchanged |
| Siemens | 3RG4012-0AG30 | PNP NO, 4mm, M12, unshielded, IP67 | Response frequency 400Hz (slightly lower than Autonics 500Hz), suitable for general applications |
| Omron | E2E-X4MD1-Z | PNP NO, 4mm, M12, unshielded, IP67 | Operating voltage 12-24VDC (narrower range), pay attention to power matching |
| Pepperl+Fuchs | NJ1.5-8GM-N | PNP NO, 4mm, M12, unshielded, IP67 | Sensing distance 1.5mm (short), need to adjust installation position |
| Turck | NI12U-EM40WD-AP6X | PNP NO, 4mm, M12, unshielded, IP67 | Cable length 3m (1m longer than Autonics), installation space to be adapted |
| Domestic Alternative | Delixi CDJ12-4DP | PNP NO, 4mm, 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: Nelle applicazioni pratiche, it is recommended to use within 70% of the rated sensing distance (≤2.8mm) to ensure detection stability and reliability.
- Carica corrispondenza: 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.
- Installation Compatibility
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.
- Note sul cablaggio
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.
- Adattabilità ambientale
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 | Marca | Modello | 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/72Città di New York |
| 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 | Contatto della Fenice |
| 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 (Relay) / 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 | Contatto della Fenice (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 VDC | Autonics |
| Sensor Proximity NPN M8 1.5mm | PR08-1.5DN | Autonics |
