4 m Retroreflective Detection
The Omron E3JK-R4M2 detects opaque objects interrupting the optical path between the sensor and a compatible reflector. Its rated sensing distance is 4 m with the E39-R1 reflector.
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Omron
Omron E3JK-R4M2 24-240VAC Photoelectric Switch Industrial Supplier
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PRODUCT DOCUMENTATION
Product Information
Technical specifications, features, applications and purchasing information.
Technical Specifications
| Brand | Omron |
| Model Number | E3JK-R4M2 |
| Product Category | Retroreflective Photoelectric Sensor |
| Product Series | E3JK, Legacy Built-In Power Supply Type |
| Sensing Method | Retroreflective, Without MSR Polarization Function |
| Rated Sensing Distance | 4 m with E39-R1 Reflector |
| Alternative Sensing Distance | 5 m with Optional E39-R2 Reflector |
| Detectable Target | Opaque Objects |
| Light Source | Pulse-Modulated Red LED |
| Power Supply, AC | 24 to 240 VAC, 50/60 Hz |
| Power Supply, DC | 12 to 240 VDC |
| Maximum AC Power Consumption | 2 VA |
| Maximum DC Power Consumption | 2 W |
| Control Output | Electromechanical SPDT Relay |
| Operation Mode | Dark-ON, Fixed |
| Maximum Relay Contact Rating | 3 A at 250 VAC, Resistive Load |
| Minimum Relay Contact Load | 10 mA at 5 VDC |
| Maximum Response Time | 30 ms for Operation and Reset |
| Sensitivity Adjustment | Fixed |
| Light Reception Indicator | Red LED |
| Connection | Pre-Wired Cable |
| Reference Cable Length | 2 m for Standard -US Pre-Wired Version; Verify Supplied Configuration |
| Protection Rating | IP64 |
| Operating Temperature | -25 to +55°C, Without Icing |
| Storage Temperature | -30 to +70°C |
| Housing Material | Plastic |
| Mounting Arrangement | Side Mounting with Through-Holes |
| Related Light-ON Model | E3JK-R4M1 |
| Related Polarized Model | E3JK-R2M2, Different Rated Sensing Distance |
| Lifecycle Reference | E3JK-R4M2-US Listed as Obsolete; Check Current Regional Status |
| Technical Reference | OMRON Legacy E3JK Photoelectric Sensor Datasheet |
Key Features
Fixed Dark-ON Operation
The output relay energizes when the light beam is interrupted or insufficient reflected light is received. This distinguishes the E3JK-R4M2 from the Light-ON E3JK-R4M1 model.
Wide AC/DC Supply Compatibility
The legacy sensor supports 24 to 240 VAC at 50/60 Hz or 12 to 240 VDC, enabling integration with appropriately rated existing industrial power and control circuits.
3 A SPDT Relay Output
A mechanical SPDT changeover relay provides common, normally open and normally closed contact connections, with a maximum resistive load rating of 3 A at 250 VAC.
30 ms Switching Response
The relay output operates and resets within a maximum specified response time of 30 ms, making the sensor applicable to compatible general-purpose machine detection tasks.
Pre-Wired Industrial Housing
The sensor uses a pre-wired electrical connection, a red light reception indicator and an IP64-rated enclosure. Proper mounting and reflector alignment are necessary for reliable detection.
Applications
- Conveyor belt object detection
- Packaging machine presence monitoring
- Industrial part counting systems
- Material handling and transfer equipment
- Warehouse conveyor control circuits
- Automatic machinery object-position detection
- Relay-interface factory automation systems
- Maintenance of legacy OMRON E3JK installations
Purchase Information
We support online purchase of the Omron E3JK-R4M2 Retroreflective Photoelectric Sensor. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
Frequently Asked Questions
What is the Omron E3JK-R4M2?
It is a legacy retroreflective photoelectric sensor with fixed Dark-ON operation, a 4 m sensing range with the E39-R1 reflector and an SPDT relay output.
What is the sensing distance?
The rated range is 4 m with an E39-R1 reflector or 5 m with an optional E39-R2 reflector under manufacturer test conditions.
Does the sensor require a reflector?
Yes. Retroreflective sensing requires a compatible reflector. Confirm whether the reflector is included with the offered unit.
What does Dark-ON mean?
The relay energizes when the reflected light is interrupted or not received, such as when an opaque target blocks the beam.
What supply voltage is supported?
The sensor supports 24 to 240 VAC at 50/60 Hz and 12 to 240 VDC, subject to the manufacturer's electrical installation requirements.
Is the output NPN or PNP?
Neither. The E3JK-R4M2 has an electromechanical SPDT relay output, not a transistor output.
What is the maximum relay contact rating?
The maximum specified resistive load is 3 A at 250 VAC. Inductive and other loads require suitable rating checks and circuit protection.
How quickly does the sensor switch?
The maximum response time is 30 ms for both relay operation and reset.
Can the sensing sensitivity be adjusted?
No. This legacy model has fixed sensitivity. Proper sensor and reflector alignment is essential.
What is the difference between E3JK-R4M1 and E3JK-R4M2?
Both models use 4 m retroreflective sensing and relay outputs. E3JK-R4M1 is Light-ON, whereas E3JK-R4M2 is Dark-ON.
Is the E3JK-R4M2 discontinued?
The E3JK-R4M2-US version is listed as obsolete by component distributors. Check current availability and regional lifecycle information before planning maintenance.
What should be checked before ordering?
Confirm the exact E3JK-R4M2 model, Dark-ON relay behavior, 4 m detection range, E39-R1 reflector arrangement, AC/DC power supply compatibility, SPDT contact wiring, IP64 protection, cable length and mechanical mounting dimensions.
Need help confirming a model?
Send us your part number and technical requirements.
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