PR18-8AO Autonics Inductive Proximity Sensor
Autonics PR18-8AO Inductive Proximity Sensor – M18, 8 mm, AC 2-Wire, NO
Autonics PR18-8AO is an M18 inductive proximity sensor with 8 mm sensing distance and AC 2-wire normally open output.
Ideal for direct AC control circuits where longer sensing range is required.
The Autonics PR18-8AO is a heavy-duty inductive proximity sensor designed for metal object detection in AC-powered industrial circuits. Featuring an M18 threaded housing, 8 mm sensing distance (non-flush), and AC 2-wire normally open output, it is suitable for applications requiring longer sensing range and direct AC load switching without PLC logic.
Key Features
Detects metal objects only (inductive principle)
Rugged M18 cylindrical housing
8 mm sensing distance (non-flush / unshielded)
AC 2-wire, Normally Open (NO) output
Direct AC switching of relays & contactors
Red LED operation indicator
Built-in surge protection
IP67 protection for harsh industrial environments
Technical Specifications
| Parameter | Value |
|---|---|
| Model | PR18-8AO |
| Sensor Type | Inductive Proximity Sensor |
| Housing Size | M18 |
| Installation | Non-flush (Unshielded) |
| Sensing Distance | 8 mm |
| Setting Distance | 0 – 5.6 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 |
Applications
AC relay & contactor control
Conveyor & material handling systems
Packaging & assembly machines
Limit & position detection
Industrial control panels
Simple automation without PLC
What’s in the Box
1 × Autonics PR18-8AO Sensor
2 × Mounting nuts
1 × Washer
Instruction leaflet
FAQ
Q1. What type of load can the PR18-8AO switch?
AC loads such as relays, contactors, solenoid valves, and pilot lamps (5–200 mA).
Q2. Is this sensor suitable for PLC inputs?
No. This is an AC 2-wire sensor, not intended 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. What is the advantage of 8 mm sensing distance?
Allows greater mounting tolerance and detection of moving metal parts from longer distances.