Maximum Controls E3K-R10K4-NR Retro-Reflective Photoelectric Safety Sensor

The Maximum Controls E3K-R10K4-NR Photoelectric Sensor is an industrial-grade, retro-reflective infrared photo eye designed for vehicle gate automation, commercial door systems, and access control applications requiring reliable non-contact obstruction detection.

Manufactured by Omron and referenced in Maximum Controls gate operator installation documentation, the E3K-R10K4-NR uses a pulsed infrared beam and a separate reflector to detect objects entering a protected area. When an object interrupts the reflected beam, the sensor changes its relay output state, allowing a compatible gate operator or control system to respond according to its programmed safety functions.

The sensor features an adjustable detection range of up to 33 feet (10 meters) with the standard E39-R1 reflector, or approximately 40 feet (12 meters) with a compatible 3-inch reflector. Its selectable Light-ON and Dark-ON operating modes, dual relay contacts, and adjustable sensitivity provide flexibility for different gate and industrial automation applications.

Designed for demanding operating environments, the E3K-R10K4-NR features a rugged industrial enclosure, infrared sensing technology, and a broad 24–240V AC/DC rated power input.

For compatible Maximum Controls operators, this photoelectric sensor can be incorporated into an appropriately designed monitored entrapment protection system when the correct sensor version, wiring arrangement, and controller monitoring method are used.

Key Features & Benefits

• Retro-Reflective Infrared Detection: Uses a single photoelectric sensor and separate reflector to detect interruptions across an entrance or protected opening.

• Up to 33 ft Standard Sensing Range: Rated for approximately 10 meters with the standard E39-R1 reflector.

• Up to 40 ft with Compatible Reflector: Extended sensing distance with a properly selected 3-inch reflector.

• Non-Contact Obstruction Detection: Detects interruptions to the infrared beam without requiring physical contact.

• Selectable Light-ON / Dark-ON Modes: Allows output operation to be configured for compatible control systems.

• Dual Relay Output Contacts: Provides flexible electrical interfacing with compatible gate controllers and industrial equipment.

• Adjustable Sensitivity: Supports precise alignment and sensitivity adjustment for installation conditions.

• Pulsed Infrared Light Source: Uses a 950 nm infrared LED for reliable reflective detection.

• Fast Response: Maximum published response time of approximately 30 milliseconds.

• Industrial-Grade Housing: Rugged enclosure with published IP67 and NEMA environmental protection ratings.

• Wide-Range Power Input: Rated for 24–240V AC or DC power.

• Status Indicators: Visual indicators assist with beam alignment, output verification, and troubleshooting.

• Maximum Controls Applications: Referenced in manufacturer wiring documentation for compatible MAX gate operator control systems.

• Gate & Door Automation Applications: Suitable for compatible commercial gate, industrial door, and access control systems.

Technical Specifications

Specification	Details
Brand / Application	Maximum Controls Gate Automation
Sensor Manufacturer	Omron
Part Number	E3K-R10K4-NR
Product Type	Retro-Reflective Photoelectric Sensor
Detection Technology	Pulsed Infrared
Light Source	950 nm Infrared LED
Standard Detection Range	33 ft / 10 m
Extended Detection Range	Up to 40 ft / 12 m with Compatible Reflector
Power Supply	24–240V AC, 50/60 Hz, or 24–240V DC
Output Configuration	DPDT Relay
Operating Modes	Light-ON / Dark-ON Selectable
Response Time	30 ms Maximum
Sensitivity	Adjustable
Electrical Connection	Screw Terminal
Environmental Ratings	IP67; Published NEMA Ratings
Operating Temperature	-13°F to 131°F (-25°C to 55°C)
Application	Gate, Door & Industrial Automation
UL 325 Monitoring	Depends on Sensor Version and Operator Wiring
Reflector	Verify Included Reflector and Type

Retro-Reflective Photoelectric Detection

The E3K-R10K4-NR uses retro-reflective technology to detect objects crossing a protected area.

Unlike a through-beam system that requires separate transmitter and receiver units, a retro-reflective sensor incorporates its optical components into one housing and directs an infrared beam toward a reflector mounted opposite the sensor.

The reflector returns the beam to the sensor during normal operation. When a vehicle, person, or other object interrupts the optical path, the sensor changes the state of its relay contacts.

When correctly connected to a compatible gate operator, this signal can be used to initiate the controller's configured obstruction response.

This arrangement offers several installation advantages:

• One primary powered sensor housing

• Reflector-based alignment across the gate opening

• No electrical wiring required at the passive reflector

• Adjustable sensitivity for installation conditions

• Relay outputs for compatible access control equipment

Actual performance depends on reflector size, alignment, environmental conditions, and the characteristics of the object being detected.

Adjustable Detection Range & Sensitivity

The E3K-R10K4-NR supports a standard detection distance of approximately 33 feet (10 meters) when used with the E39-R1 reflector.

With a compatible larger reflector, sensing distance may extend to approximately 40 feet (12 meters).

The sensor includes sensitivity adjustment to help installers optimize detection performance and establish a stable optical connection.

Proper sensor and reflector alignment is essential for reliable operation.

The sensor also incorporates visual indicators that assist with confirming beam reception and output operation during installation and troubleshooting.

Light-ON / Dark-ON Operation

The E3K-R10K4-NR supports selectable Light-ON and Dark-ON operating modes.

These settings determine how the relay output responds to the presence or absence of the reflected infrared beam.

This flexibility allows the sensor to interface with compatible controllers that require particular relay states during normal and obstructed conditions.

Important: For Maximum Controls gate operators, use the operating mode and relay terminals specified in the installation manual for the exact controller and safety input. Selecting the incorrect mode or terminals can prevent proper obstruction detection.

Maximum Controls Gate Operator Compatibility

The E3K family of retro-reflective photoelectric sensors appears in Maximum Controls installation documentation for various gate operator control systems.

Depending on the operator generation and controller, installation instructions may specify normally closed monitoring, monitored power arrangements, or 10K resistive monitoring.

Potential applications include compatible Maximum Controls sliding gate and swing gate systems that explicitly support the applicable E3K sensor configuration.

Compatibility must be verified by the exact operator model, controller revision, and photo eye version. An E3K sensor used with one Maximum Controls control board should not automatically be assumed compatible with every Matrix III, Omega I, or earlier controller.

UL 325 Safety & Monitored Entrapment Protection

Photoelectric sensors are an important component of properly designed vehicular gate safety systems.

When installed in a compatible monitored entrapment protection circuit, the sensor can help detect obstructions in designated areas of gate travel.

However, the E3K-R10K4-NR part number alone does not establish current UL 325 monitored-sensor compatibility.

Maximum Controls documentation includes specific wiring arrangements for E3K sensors, including configurations using monitored power and versions with built-in 10K resistance.

The exact version and wiring method must match the operator's monitoring requirements.

A standard non-monitored relay photo eye must not be represented as an approved monitored entrapment protection device without confirmation from the gate operator manufacturer.

Additional safety sensors may be required to protect all identified entrapment zones.

Ideal Applications

The Maximum Controls E3K-R10K4-NR is suitable for appropriately designed and compatible applications including:

• Automatic sliding gate systems

• Commercial swing gate systems

• Industrial gate entrances

• Commercial overhead doors

• Warehouse access openings

• Parking and vehicle access systems

• Industrial automation equipment

• Object detection and equipment monitoring

• Replacement of matching photoelectric sensor assemblies

Installation & Important Ordering Information

Installation should be performed by qualified gate automation or industrial control personnel.

The installer must verify the correct power supply, sensor output mode, terminal connections, monitoring method, and reflector alignment before placing the system into service.

Important ordering considerations:

• Confirm the exact part number on the existing sensor.

• Verify whether the installation requires a monitored or non-monitored sensor.

• Confirm the controller's supported safety input and monitoring method.

• Verify reflector size and whether the reflector is included.

• Check current manufacturer availability and approved replacement options.

Product Note: The E3K-R10K4-NR has been listed as obsolete by industrial component distributors. Confirm availability and the exact supplied version before ordering.

Warranty: Applicable manufacturer or distributor warranty terms depend on the source and condition of the supplied sensor. Verify current coverage before purchase.