TG - E3Z Series - Sensitivity Adjustment & Operation Mode Selection

Purpose

This guide explains how to adjust the sensitivity and configure the Light ON /  Dark ON operation mode on Omron's E3Z series photoelectric sensors. This ensures optimal detection performance and minimizes false triggering.

Supported Devices

Models with built-in amplifier and manual adjusters, including:

• E3Z-D6x (Diffuse-reflective)
• E3Z-R6x (Retro-reflective with MSR)
• E3Z-T6x (Through-beam Receiver only)
• E3Z-B6x / L6x (Narrow-beam / Transparent)

Requirements

• Proper wiring to 12-24 VDC power supply
• Sensor must be mounted using M3 screws (max. torque: 0.53 Nm)
• Reflector (e.g., E39-R1S)

Procedure

1. Power On the sensor

Connect brown to +V, blue to 0V, and black as the control output.
Check that the orange LED (operation indicator) turns ON when light is detected (depends on mode).

NPN Output

PNP Output

2. Place the target object

Ensure the object is placed at the correct sensing distance:

• Diffuse-reflective: up to 1 m
• Retro-reflective: 3-4m (using E39-R1 or R15)
• Through-beam: up to 30m (receiver side only)

3. Adjust sensitivity 

1. Turn the sensitivity adjuster clockwise (CW) until the orange LED turns ON (object detected).
2. Remove the object and keep turning CW until the LED turns ON again (background detected).
3. Then turn counterclockwise (CCW) until the LED turns OFF.
4. Set the adjuster at the midpoint between object and background detection.
5. The green LED should stay ON if the signal is stable.

4. Select Operation Mode (Light ON or Dark ON)

Use the operation selector switch on the sensor body:

• Light ON: Output is ON when light is received
• Dark ON: Output is ON when light is interrupted

5. Test the detection

Move the object in and out of the sensing area

Observe that the green stability LED remains on when the object is detected

Additional notes

• Retro-reflective sensors require a reflector (e.g., E39-R1S).
• Avoid direct exposure to sunlight or incandescent light behind the object (>3000 lux).
• Models support IP67 protection (suitable for harsh environments).

Date/Revision History

First review 6/27/2024 V1.0

Author: 

Mario Moreno, Technical Support Engineer

References

E3Z: Compact Photoelectric Sensor with Built-in Amplifier

E3Z: Operating procedures