Technical Overview
The Omron E3FA-RN12 is a straight-type coaxial retro-reflective photoelectric sensor with NPN output and 2 m pre-wired cable. Omron specifies a 0–500 mm sensing distance with the E39-R1S reflector, 624 nm red LED, selectable Light-ON/Dark-ON operation, 0.5 ms response and IP67/IP69K protection. The reflector is a separate accessory; current supply status is recorded as Unknown.
An NPN coaxial retro-reflective sensor rated 0–500 mm with the E39-R1S reflector.
Key Features
- Exact model E3FA-RN12 2M, straight-type plastic-housing sensor
- Coaxial retro-reflective sensing, 0–500 mm with E39-R1S reflector
- NPN open-collector output; Light-ON/Dark-ON selectable by wiring
- Red LED, 624 nm
- 10–30 VDC supply; 25 mA max. current consumption
- 0.5 ms response time
- IP67 IEC and IP69K protection ratings
- 2 m pre-wired cable; approx. 50 g sensor-only weight
- E39-R1S reflector sold separately; supply status recorded as Unknown
Use coaxial red-light sensing up to 500 mm with a compatible reflector.
Technical Specification Matrix
| Parameter | Value |
| Sensor type | Straight-type coaxial retro-reflective sensor with MSR function |
| Housing | Plastic E3FA housing; ABS case |
| Sensing distance | 0–500 mm with E39-R1S reflector |
| Light source | Red LED, 624 nm |
| Output | NPN open collector; Light-ON/Dark-ON selectable by wiring |
| Power supply | 10–30 VDC; ripple 10% p-p max. |
| Current consumption | 25 mA max. |
| Control output | 30 VDC max. load supply; 100 mA max. load current; residual voltage 3 V max. |
| Response time | 0.5 ms |
| Operating / storage temperature | −25 to +55 °C / −40 to +70 °C, no icing or condensation |
| Ambient humidity | Operating 35–85% RH; storage 35–95% RH, no condensation |
| Protection | IP67 (IEC); IP69K (DIN 40050-9) |
| Connection | Pre-wired cable, 2 m |
| Physical Weight (kg) | Pre-wired cable, 2 m |
| Dimensions L x W x H (cm) | Approx. 0.010 kg, sensor only |
| Supply status | Not stated numerically in consulted specifications |
Suggested applications
Engineering suggestions require suitability checks for your installation.
1. Reflector-based conveyor detection
A conveyor may need to detect a target across a longer sensing gap.
Potential use
The 0–500 mm rating with E39-R1S can be evaluated for object detection; install the specified reflector and verify alignment and sensing margins.
0–500 mm
Coaxial
E39-R1S
NPN
2. Access or position sensing
A machine station may need a discrete signal when an object interrupts the sensor-reflector path.
Potential use
Use the selectable Light-ON/Dark-ON output with compatible input logic after confirming reflector placement, sensing distance and ambient conditions.
0.5 ms
2 m cable
IP67/IP69K
Reflective