E3Z-D61 Diffuse-Reflective Photoelectric Sensor – 100mm, NPN, 12–24V DC

The E3Z-D61 Photoelectric Sensor is a compact industrial diffuse-reflective sensor designed for reliable non-contact object detection in automation, machinery, conveyor and production-line applications.

It combines the infrared emitter, receiver and amplifier in a single compact housing, eliminating the need for a separate reflector or receiving sensor.

The E3Z-D61 operates from 12–24V DC and provides an NPN open-collector output with selectable Light-ON or Dark-ON operation.

Technical Specifications

• Model: E3Z-D61
• Sensor Type: Photoelectric Sensor
• Sensing Method: Diffuse Reflective
• Maximum Sensing Distance: 100mm
• Reference Target: White Paper, 100 × 100mm
• Supply Voltage: 12–24V DC
• Output Type: NPN Open Collector
• Operation Mode: Light-ON / Dark-ON Selectable
• Light Source: Infrared LED
• Wavelength: Approx. 860nm
• Response Time: 1ms Max.
• Current Consumption: 30mA Max.
• Control Output: Up to 100mA at 26.4V DC
• Sensitivity Adjustment: Yes
• Hysteresis: 20% Max. of Setting Distance
• Protection Rating: IP67
• Operating Temperature: -25°C to +55°C
• Housing Material: PBT
• Connection: Pre-Wired Cable
• Standard Cable Length: 2m
• Approximate Dimensions: 31 × 20 × 10.8mm

Diffuse-Reflective Object Detection

The E3Z-D61 uses diffuse-reflective sensing.

The sensor emits infrared light toward the target object. Light reflected from the object returns to the receiver, allowing the sensor to determine whether an object is present.

Because both the transmitter and receiver are contained inside the same housing, no separate reflector is required.

Up to 100mm Detection Distance

The E3Z-D61 provides a maximum nominal sensing distance of:

100mm

This specification is based on a standard 100 × 100mm white paper target.

Actual sensing distance can vary depending on:

• Object Color
• Object Size
• Surface Finish
• Reflectivity
• Installation Angle
• Ambient Conditions

Dark or low-reflectivity objects may have a shorter reliable detection distance than white or reflective objects.

Adjustable Sensitivity

The built-in adjustment allows the sensor's detection threshold to be optimized for the application.

This is useful when detecting objects of different colors, sizes and reflective characteristics or when the sensor must ignore objects beyond the desired detection point.

NPN Open-Collector Output

The E3Z-D61 provides an:

NPN Open-Collector Output

with a maximum control output of approximately:

100mA at 26.4V DC

This output configuration is commonly used with:

• PLC Inputs
• Industrial Controllers
• Counters
• Relays
• Automation Equipment
• Microcontroller Interface Circuits

For larger loads, use an appropriate relay, contactor or driver rather than powering the load directly from the sensor output.

Light-ON / Dark-ON Selectable

The sensor supports selectable:

Light-ON (L-ON)

and

Dark-ON (D-ON)

operation.

This allows the output behavior to be configured according to the control-system requirements.

Fast 1ms Response

With a response time of up to approximately:

1ms

the E3Z-D61 is suitable for detecting moving objects in applications such as:

• Conveyor Systems
• Production Lines
• Automatic Counters
• Packaging Machines
• Sorting Systems
• Position Detection

Infrared Light Source

The E3Z-D61 uses an infrared LED with a wavelength of approximately:

860nm

Because infrared light is outside the normal visible spectrum, the sensing beam itself may not be clearly visible to the human eye.

IP67 Protection

The sensor housing is rated:

IP67

providing protection against dust and temporary water exposure when correctly installed.

This makes it suitable for many industrial and automation environments.

Typical Wiring

For common DC E3Z-D61 versions:

• Brown: +12–24V DC
• Blue: 0V / GND
• Black: NPN Output
• Always verify the wiring diagram printed on the sensor or supplied documentation before connecting power.

PLC Compatibility

The NPN output makes the E3Z-D61 suitable for many industrial PLC and controller inputs designed for NPN/sinking sensors.

Always verify that the PLC input configuration is compatible with an NPN open-collector sensor before wiring.

Arduino & ESP32 Integration

The E3Z-D61 can also be interfaced with Arduino, ESP32 and other microcontrollers, but it should not be connected as though it were a 5V hobby sensor.

The sensor itself requires:

12–24V DC

Its NPN open-collector output can be interfaced to a suitable low-voltage digital input using an appropriate pull-up/interface circuit.

For an ESP32, ensure the GPIO signal remains within the 3.3V logic limit.

The microcontroller ground and sensor power-supply ground must be correctly referenced when using a non-isolated interface.

Applications

Ideal for:

• Industrial Automation
• Conveyor Systems
• Production Lines
• Object Detection
• Product Counting
• Packaging Machines
• Sorting Machines
• Position Detection
• Presence Detection
• Automatic Machinery
• PLC Systems
• Robotics
• Factory Automation
• Material Handling Equipment

E3Z-D61 vs E18-D80NK

The E3Z-D61 and E18-D80NK are both reflective object-detection sensors, but they are intended for somewhat different applications.

E3Z-D61

• Industrial-style photoelectric sensor
• 12–24V DC operation
• Up to 100mm sensing distance
• NPN output
• Light-ON / Dark-ON selectable
• 1ms response
• IP67 protection

E18-D80NK

• Hobby/general-purpose IR proximity sensor
• Typically 5V DC
• Longer adjustable nominal detection range
• Commonly used in Arduino and small robotics projects

For industrial automation and PLC applications, the E3Z-D61 is generally the more appropriate sensor.

Important Notes

• This is a diffuse-reflective object sensor, not a distance-measuring sensor.
• It provides an ON/OFF switching output rather than a numerical distance measurement.
• Maximum nominal sensing distance is 100mm using the specified reference target.
• Actual sensing distance depends on the object's color, size and reflectivity.
• Supply voltage is 12–24V DC.
• Output is NPN open collector.
• Light-ON and Dark-ON modes are selectable.
• Do not connect 12–24V directly to Arduino, ESP32 or other low-voltage GPIO pins.
• Verify wiring and output configuration before installation.
• For high-current loads, use a suitable external relay or driver.

Package Includes

1 × E3Z-D61 Diffuse-Reflective Photoelectric Sensor