Autonics PR18-5AO Inductive Proximity Sensor – M18, 5 mm, AC 2-Wire, NO
Autonics PR18-5AO is an M18 inductive proximity sensor with 5 mm sensing distance and AC 2-wire normally open output.
Ideal for direct AC control circuits, relay logic, and industrial automation without PLC interfaces.
The Autonics PR18-5AO is a robust inductive proximity sensor designed for detecting metal objects only in AC-powered circuits. With an M18 threaded housing, 5 mm sensing distance, and AC 2-wire normally open output, it can directly switch AC loads such as relays, contactors, and pilot lamps in industrial control systems.
Detects metal objects only (inductive principle)
Rugged M18 cylindrical housing
5 mm sensing distance (flush / shielded)
AC 2-wire, Normally Open (NO) output
Direct AC load switching (relay/contactor)
Red LED operation indicator
Surge protection circuit
IP67 protection for harsh industrial environments
| Parameter | Value |
|---|---|
| Model | PR18-5AO |
| Sensor Type | Inductive Proximity Sensor |
| Housing Size | M18 |
| Installation | Flush (Shielded) |
| Sensing Distance | 5 mm |
| Setting Distance | 0 – 3.5 mm |
| Standard Target | Iron 18 × 18 × 1 mm |
| Output Type | AC 2-Wire, Normally Open (NO) |
| Operating Voltage | 100–240 V AC, 50/60 Hz |
| Leakage Current | ≤ 2.2 mA |
| Load Current | 5–200 mA |
| Residual Voltage | ≤ 20 V |
| Response Frequency | Approx. 20 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 |
AC relay & contactor control
Conveyor systems
Packaging & assembly machines
Limit & position detection
Industrial control panels
Simple automation without PLC
1 × Autonics PR18-5AO Sensor
2 × Mounting nuts
1 × Washer
Instruction leaflet
Q1. What type of load can the PR18-5AO switch?
AC loads such as relays, contactors, and indicator lamps (5–200 mA).
Q2. Is this sensor suitable for PLC input?
No. This is an AC 2-wire sensor, not meant for DC PLC inputs.
Q3. What does "AO" mean in the model number?
A = AC type, O = Normally Open output.
Q4. What material can it detect?
Only metal objects.
Q5. Is it suitable for harsh industrial environments?
Yes. It has IP67 protection and surge protection.
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