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Technical specifications, features, applications and purchasing information.
| Brand | OMRON |
| Model Number | E3JK-R4M1 |
| Product Category | Retroreflective Photoelectric Sensor |
| Product Series | E3JK |
| Sensor Type | Built-In Power Supply Photoelectric Sensor |
| Sensing Method | Retroreflective |
| Polarization / MSR Function | Without MSR Function |
| Rated Sensing Distance | 4 m (13.12 ft) with E39-R1 Reflector |
| Reference Maximum Sensing Distance | 5 m Under Manufacturer-Specified Conditions |
| Standard Sensing Object | Opaque Object, 75 mm Diameter Minimum |
| Required Optical Arrangement | Sensor and Compatible Reflector Positioned Opposite Each Other |
| Reference Reflector | OMRON E39-R1 |
| Light Source | Pulse-Modulated Red LED |
| Light Wavelength | 660 nm |
| Directional Angle | 1° to 5° |
| Nominal DC Supply Range | 12 to 240 VDC ±10% |
| Nominal AC Supply Range | 24 to 240 VAC ±10%, 50/60 Hz |
| Maximum Supply Ripple | 10% Peak-to-Peak for DC Supply |
| Maximum Power Consumption | 2 W |
| Output Configuration | Electromechanical Relay, SPDT Changeover Contact |
| Operation Mode | Light-ON |
| Relay Operation | Relay Energized When Reflected Light Is Received |
| Maximum Relay Contact Rating | 3 A at 250 VAC, Resistive Load, Power Factor 1 |
| Minimum Applicable Relay Load | 10 mA at 5 VDC |
| Maximum Response Time | 30 ms |
| Sensitivity Adjustment | Fixed; No Adjustable Sensitivity Control |
| Operation Indicator | Red LED |
| Relay Mechanical Life | 50 Million Operations Minimum Under Specified Test Conditions |
| Relay Electrical Life | 100,000 Operations Minimum Under Specified Test Conditions |
| Electrical Connection | Pre-Wired Cable |
| Standard Cable Length | 2 m for Standard Pre-Wired Version; Verify Exact Supplied Variant |
| Protection Rating | IEC 60529 IP64 |
| Operating Temperature | -25 to +55°C, Without Icing or Condensation |
| Storage Temperature | -30 to +70°C, Without Icing or Condensation |
| Operating Humidity | 45 to 85% RH, Noncondensing |
| Storage Humidity | 35 to 95% RH, Noncondensing |
| Ambient Light Immunity | Incandescent Light, 3000 lx Maximum |
| Minimum Insulation Resistance | 20 MΩ at 500 VDC |
| Dielectric Strength | 1500 VAC, 50/60 Hz for 1 Minute |
| Vibration Resistance | 10 to 55 Hz, 1.5 mm Double Amplitude, Under Specified Test Conditions |
| Housing Material | ABS Resin |
| Optical Lens Material | Methacrylic Resin |
| Cable Jacket Material | PVC |
| Manufacturer Lifecycle | Discontinued / Obsolete Legacy Model |
| Related Dark-ON Model | OMRON E3JK-R4M2 |
| Related Polarized Retroreflective Model | OMRON E3JK-R2M1; Different Sensing Distance and MSR Configuration |
| Replacement Consideration | OMRON E3JM-R4M4-US Is Listed as a Similar Substitute by Distributors; Verify Electrical and Mechanical Compatibility |
| Manufacturer Technical Reference | OMRON E3JK Legacy Photoelectric Sensor Datasheet and Product Discontinuation Documentation |
The OMRON E3JK-R4M1 uses a retroreflective optical sensing method with a rated detection distance of 4 meters when paired with the specified E39-R1 reflector. Objects interrupting the reflected beam can be detected without requiring a separate powered receiver.
Its built-in power supply supports nominal voltages of 12 to 240 VDC or 24 to 240 VAC at 50/60 Hz, providing flexibility when maintaining existing industrial control equipment with different power supply configurations.
An electromechanical SPDT relay output supports a maximum resistive switching load of 3 A at 250 VAC. Unlike NPN or PNP transistor models, the E3JK-R4M1 uses relay contacts and must be wired according to its relay output diagram.
The E3JK-R4M1 is a Light-ON model: its output relay energizes when reflected light is received from the reflector. When an opaque target blocks the optical path, the relay returns to its non-energized state.
A pulse-modulated red LED with a wavelength of approximately 660 nm provides the optical sensing source. The sensor is designed for compatible opaque-object detection rather than specialized polarized detection of mirror-like surfaces.
The legacy E3JK housing uses ABS resin with an IP64 protection rating and a pre-wired connection. It operates over an ambient temperature range of -25 to +55°C, supporting appropriately protected industrial installations.
We support online purchase of the OMRON E3JK-R4M1 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.
What is the OMRON E3JK-R4M1?
It is a legacy OMRON E3JK series retroreflective photoelectric sensor with a 4 m rated sensing distance, universal AC/DC power supply and Light-ON SPDT relay output.
What is the sensing distance?
The rated sensing distance is 4 m with the OMRON E39-R1 reflector. Actual operating distance depends on reflector condition, alignment, environmental conditions and target characteristics.
Does E3JK-R4M1 require a reflector?
Yes. It uses a retroreflective sensing method and requires a compatible reflector, typically the E39-R1. Confirm whether the reflector is included with the supplied unit.
What power supply voltage does it support?
The legacy E3JK-R4M1 supports nominal supplies of 12 to 240 VDC or 24 to 240 VAC at 50/60 Hz, within the manufacturer's specified tolerances.
Is E3JK-R4M1 an NPN or PNP sensor?
Neither. It uses an electromechanical SPDT relay output rather than an NPN or PNP transistor output.
What does Light-ON mean for this sensor?
Light-ON means the output relay is energized when the sensor receives light reflected from the target reflector. Blocking the beam causes the relay to de-energize.
What is the maximum relay contact rating?
The relay output is rated for a maximum of 3 A at 250 VAC with a resistive load and a power factor of 1. Other load types require appropriate derating and circuit protection.
How quickly does the sensor respond?
Its maximum specified response time is 30 ms, reflecting the mechanical relay output design.
Does E3JK-R4M1 detect shiny or reflective objects reliably?
The E3JK-R4M1 is a non-MSR retroreflective model. Highly reflective targets can produce unwanted reflected light. A polarized retroreflective sensor should be considered when detecting reflective or mirror-like objects.
What is the difference between E3JK-R4M1 and E3JK-R4M2?
Both are 4 m retroreflective relay-output models. The E3JK-R4M1 operates in Light-ON mode, while the E3JK-R4M2 operates in Dark-ON mode, so their relay behavior differs.
Has OMRON discontinued E3JK-R4M1?
Yes. The legacy E3JK-R4M1 is listed as obsolete by major component distributors and the manufacturer. Please verify mechanical and electrical compatibility when selecting replacement models or sourcing maintenance stock.
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| Brand | OMRON |
| Model Number | E3JK-R4M1 |
| Product Category | Retroreflective Photoelectric Sensor |
| Product Series | E3JK |
| Sensor Type | Built-In Power Supply Photoelectric Sensor |
| Sensing Method | Retroreflective |
| Polarization / MSR Function | Without MSR Function |
| Rated Sensing Distance | 4 m (13.12 ft) with E39-R1 Reflector |
| Reference Maximum Sensing Distance | 5 m Under Manufacturer-Specified Conditions |
| Standard Sensing Object | Opaque Object, 75 mm Diameter Minimum |
| Required Optical Arrangement | Sensor and Compatible Reflector Positioned Opposite Each Other |
| Reference Reflector | OMRON E39-R1 |
| Light Source | Pulse-Modulated Red LED |
| Light Wavelength | 660 nm |
| Directional Angle | 1° to 5° |
| Nominal DC Supply Range | 12 to 240 VDC ±10% |
| Nominal AC Supply Range | 24 to 240 VAC ±10%, 50/60 Hz |
| Maximum Supply Ripple | 10% Peak-to-Peak for DC Supply |
| Maximum Power Consumption | 2 W |
| Output Configuration | Electromechanical Relay, SPDT Changeover Contact |
| Operation Mode | Light-ON |
| Relay Operation | Relay Energized When Reflected Light Is Received |
| Maximum Relay Contact Rating | 3 A at 250 VAC, Resistive Load, Power Factor 1 |
| Minimum Applicable Relay Load | 10 mA at 5 VDC |
| Maximum Response Time | 30 ms |
| Sensitivity Adjustment | Fixed; No Adjustable Sensitivity Control |
| Operation Indicator | Red LED |
| Relay Mechanical Life | 50 Million Operations Minimum Under Specified Test Conditions |
| Relay Electrical Life | 100,000 Operations Minimum Under Specified Test Conditions |
| Electrical Connection | Pre-Wired Cable |
| Standard Cable Length | 2 m for Standard Pre-Wired Version; Verify Exact Supplied Variant |
| Protection Rating | IEC 60529 IP64 |
| Operating Temperature | -25 to +55°C, Without Icing or Condensation |
| Storage Temperature | -30 to +70°C, Without Icing or Condensation |
| Operating Humidity | 45 to 85% RH, Noncondensing |
| Storage Humidity | 35 to 95% RH, Noncondensing |
| Ambient Light Immunity | Incandescent Light, 3000 lx Maximum |
| Minimum Insulation Resistance | 20 MΩ at 500 VDC |
| Dielectric Strength | 1500 VAC, 50/60 Hz for 1 Minute |
| Vibration Resistance | 10 to 55 Hz, 1.5 mm Double Amplitude, Under Specified Test Conditions |
| Housing Material | ABS Resin |
| Optical Lens Material | Methacrylic Resin |
| Cable Jacket Material | PVC |
| Manufacturer Lifecycle | Discontinued / Obsolete Legacy Model |
| Related Dark-ON Model | OMRON E3JK-R4M2 |
| Related Polarized Retroreflective Model | OMRON E3JK-R2M1; Different Sensing Distance and MSR Configuration |
| Replacement Consideration | OMRON E3JM-R4M4-US Is Listed as a Similar Substitute by Distributors; Verify Electrical and Mechanical Compatibility |
| Manufacturer Technical Reference | OMRON E3JK Legacy Photoelectric Sensor Datasheet and Product Discontinuation Documentation |
The OMRON E3JK-R4M1 uses a retroreflective optical sensing method with a rated detection distance of 4 meters when paired with the specified E39-R1 reflector. Objects interrupting the reflected beam can be detected without requiring a separate powered receiver.
Its built-in power supply supports nominal voltages of 12 to 240 VDC or 24 to 240 VAC at 50/60 Hz, providing flexibility when maintaining existing industrial control equipment with different power supply configurations.
An electromechanical SPDT relay output supports a maximum resistive switching load of 3 A at 250 VAC. Unlike NPN or PNP transistor models, the E3JK-R4M1 uses relay contacts and must be wired according to its relay output diagram.
The E3JK-R4M1 is a Light-ON model: its output relay energizes when reflected light is received from the reflector. When an opaque target blocks the optical path, the relay returns to its non-energized state.
A pulse-modulated red LED with a wavelength of approximately 660 nm provides the optical sensing source. The sensor is designed for compatible opaque-object detection rather than specialized polarized detection of mirror-like surfaces.
The legacy E3JK housing uses ABS resin with an IP64 protection rating and a pre-wired connection. It operates over an ambient temperature range of -25 to +55°C, supporting appropriately protected industrial installations.
We support online purchase of the OMRON E3JK-R4M1 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.
What is the OMRON E3JK-R4M1?
It is a legacy OMRON E3JK series retroreflective photoelectric sensor with a 4 m rated sensing distance, universal AC/DC power supply and Light-ON SPDT relay output.
What is the sensing distance?
The rated sensing distance is 4 m with the OMRON E39-R1 reflector. Actual operating distance depends on reflector condition, alignment, environmental conditions and target characteristics.
Does E3JK-R4M1 require a reflector?
Yes. It uses a retroreflective sensing method and requires a compatible reflector, typically the E39-R1. Confirm whether the reflector is included with the supplied unit.
What power supply voltage does it support?
The legacy E3JK-R4M1 supports nominal supplies of 12 to 240 VDC or 24 to 240 VAC at 50/60 Hz, within the manufacturer's specified tolerances.
Is E3JK-R4M1 an NPN or PNP sensor?
Neither. It uses an electromechanical SPDT relay output rather than an NPN or PNP transistor output.
What does Light-ON mean for this sensor?
Light-ON means the output relay is energized when the sensor receives light reflected from the target reflector. Blocking the beam causes the relay to de-energize.
What is the maximum relay contact rating?
The relay output is rated for a maximum of 3 A at 250 VAC with a resistive load and a power factor of 1. Other load types require appropriate derating and circuit protection.
How quickly does the sensor respond?
Its maximum specified response time is 30 ms, reflecting the mechanical relay output design.
Does E3JK-R4M1 detect shiny or reflective objects reliably?
The E3JK-R4M1 is a non-MSR retroreflective model. Highly reflective targets can produce unwanted reflected light. A polarized retroreflective sensor should be considered when detecting reflective or mirror-like objects.
What is the difference between E3JK-R4M1 and E3JK-R4M2?
Both are 4 m retroreflective relay-output models. The E3JK-R4M1 operates in Light-ON mode, while the E3JK-R4M2 operates in Dark-ON mode, so their relay behavior differs.
Has OMRON discontinued E3JK-R4M1?
Yes. The legacy E3JK-R4M1 is listed as obsolete by major component distributors and the manufacturer. Please verify mechanical and electrical compatibility when selecting replacement models or sourcing maintenance stock.
