PRT12-4DO Autonics Proximity Sensor
Autonics PRT12-4DO Inductive Proximity Sensor – M12, 4 mm, NPN, DC 3-Wire
Autonics PRT12-4DO is an M12 inductive proximity sensor with 4 mm sensing distance and NPN DC 3-wire output.
Designed for reliable metal detection in PLC-controlled industrial automation.
The Autonics PRT12-4DO is a cylindrical inductive proximity sensor designed to detect metal objects only in industrial automation environments. With its M12 threaded housing, 4 mm sensing distance (flush type), and NPN DC 3-wire normally open output, it provides stable, repeatable performance for control panels, compact machines, and OEM equipment connected to PLC digital inputs.
Key Features
Detects metal objects only (inductive sensing principle)
Compact M12 cylindrical housing
4 mm sensing distance (flush / shielded)
NPN, DC 3-wire Normally Open (NO) output
Suitable for PLC digital inputs
Red LED operation indicator
Reverse polarity & short-circuit protection
IP67 protection for industrial environments
Technical Specifications
| Parameter | Value |
|---|---|
| Model | PRT12-4DO |
| Sensor Type | Inductive Proximity Sensor |
| Housing Size | M12 |
| Installation | Flush (Shielded) |
| Sensing Distance | 4 mm |
| Setting Distance | 0 – 2.8 mm |
| Standard Target | Iron 12 × 12 × 1 mm |
| Output Type | NPN, Normally Open (NO) |
| Wiring | DC 3-Wire |
| Supply Voltage | 12–24 V DC (10–30 V DC operating) |
| Current Consumption | ≤ 10 mA |
| Control Output | Max. 200 mA |
| Response Frequency | Approx. 500 Hz |
| Indicator | Red LED |
| Protection Rating | IP67 |
| Ambient Temperature | −25 °C to +70 °C |
| Cable Length | 2 m |
| Body Material | Nickel-plated brass |
| Sensing Face | PBT |
Applications
PLC-based automation systems
Compact control & junction panels
Packaging & assembly machines
OEM industrial equipment
Position, limit & presence detection
Space-constrained machinery
What’s in the Box
1 × Autonics PRT12-4DO Sensor
2 × Mounting nuts
Instruction leaflet
FAQ
Q1. What material can PRT12-4DO detect?
Only metal objects.
Q2. Is PRT12-4DO suitable for PLC inputs?
Yes. It provides an NPN DC 3-wire output, commonly used with PLC digital inputs.
Q3. What is the sensing distance?
4 mm with a standard iron target.
Q4. What does flush mounting mean?
Flush mounting allows installation level with surrounding metal without false triggering.
Q5. Can it be used in dusty or oily environments?
Yes. IP67 protection ensures reliable operation.