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Part of the Omron Photoelectric Sensors series — see the full model table, lifecycle status and replacement parts.

Omron E3Z-LL61 BGS laser photoelectric sensor — front view showing the compact 20 × 11 × 31 mm PBT housing with the laser emitter window on the front face, the yellow operation indicator LED visible at the rear, and the visible red laser Class 1 spot projected on a white paper target at 200 mm distance

Omron E3Z-LL61 — BGS Laser Sensor, 300 mm, NPN, 2 m

SKU: E3Z-LL61

USD 34.00

Compact laser photoelectric sensor with distance-settable (BGS / background-suppression) sensing, 20 to 300 mm range on white paper

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Product Overview

The Omron E3Z-LL61 is the NPN-output member of the E3Z-LL family of compact laser photoelectric sensors with distance-settable (BGS = Background Suppression) technology. manufactured by Omron Corporation. Hengyixin Automation ships this sensor from our Xiamen warehouse with a 30-day DOA return window and a datasheet PDF included in the box.

Unlike diffuse-reflective sensors that detect any target within range regardless of position, BGS sensors use a position-sensitive detector (PSD) to detect only targets within a settable distance window — everything closer than the set threshold is ignored, and everything beyond is treated as background. The E3Z-LL61 lets you set the detection threshold anywhere from 40 to 300 mm for white paper targets (or 40 to 160 mm for black paper targets) using the rear-face 6-turn potentiometer.

The optimal setting is one half-turn clockwise beyond the 'just ON' point — this gives the most reliable detection across minor target variations (color, reflectivity, surface finish).

Key Features

  • 30 mA current consumption max
  • 100 mA max switching current
  • 12 to 24 VDC ±10 % operating voltage
  • Visible red laser spot — 0.5 mm diameter for precision targeting
  • SKU: E3Z-LL61
  • Series: E3Z-L Compact Laser Photoelectric Sensor (BGS / Distance-settable)
  • Voltage: 24 VDC

Best-Fit Applications

  • Small-part detection on a precision assembly line — E3Z-LL61 detects a 2 mm stainless-steel pin protruding 50 mm from a.
  • Label-edge detection on a glossy product label applicator — E3Z-LL61 set to 80 mm detects the label edge as it.
  • Personnel-detection at a machine-guard entrance — E3Z-LL61 mounted horizontally detects a hand entering the guarded zone at 200 mm; the.

Buying Checklist

  • Pick E3Z-LL81 for PNP output sibling
  • Pick E3Z-LL63 / LL83 for extended-range variant
  • Pick E3Z-LS61 for LED-based BGS at 10-100 mm range

Technical Specifications

Model E3Z-LL61
Series E3Z-L Compact Laser Photoelectric Sensor (BGS / Distance-settable)
Type Diffuse-reflective with BGS (background suppression), laser emitter
Sensing Method Distance-setting (BGS), position-sensitive detector (PSD)
Sensing Distance White paper 100×100 mm: 20 to 300 mm; Black paper 100×100 mm: 20 to 160 mm
Setting Range White paper 100×100 mm: 40 to 300 mm; Black paper 100×100 mm: 40 to 160 mm
Spot Size 0.5 mm dia max at sensing distance
Light Source 650 nm visible red laser diode, Class 1 (IEC 60825-1), ≤ 1 mW output
Output Type NPN open-collector transistor (sinking)
Output Suffix Logic 61/63/66/68 = NPN; 81/83/86/88 = PNP; 63/68/83/88 = extended range
Output Current 100 mA max (load current)
Output Voltage Rating 24 VDC max (load supply)
Residual Voltage 1.5 V max at 100 mA load
Leakage Current 0.1 mA max (output OFF)
Operating Voltage 12 to 24 VDC ±10 % (10 % p-p ripple max)

FAQ for E3Z-LL61

What's the difference between E3Z-LL61 and E3Z-D82?
The E3Z-LL61 is a laser BGS (background-suppression) sensor with adjustable threshold 40-300 mm; the E3Z-D82 is a red-LED diffuse-reflective sensor with 1 m range. The E3Z-LL61 uses a position-sensitive detector (PSD) to detect only targets within a settable distance window — closer targets are distinguished from farther targets; the E3Z-D82 detects any target within 1 m regardless of distance.
How do I set the detection threshold on the E3Z-LL61?
The 6-turn trimmer on the rear face sets the detection threshold. Mount the sensor at the desired working distance from the target, with the target present. Rotate the trimmer counter-clockwise (decrease threshold) until the yellow indicator just turns OFF — this is the 'no detection' point. Then rotate clockwise (increase threshold) until the indicator just turns ON — this is the 'detection' point.
Is the laser in the E3Z-LL61 safe for operators?
Yes — the E3Z-LL61 uses a 650 nm visible red laser diode with output power ≤ 1 mW, classified as Class 1 (IEC 60825-1). Class 1 lasers are eye-safe under all normal use conditions including direct viewing, even with optical instruments (the laser is too low-power to cause retinal damage). The only precaution is to avoid direct viewing through magnifying optics (microscope, telescope) at distances < 100 mm, where the laser can exceed Class 1 limits.
Why does the E3Z-LL61 fail on highly-reflective backgrounds?
The BGS sensor uses a position-sensitive detector (PSD) to detect the angle of returned light — closer targets reflect at a different angle than farther targets. On a mirror-finish background surface (polished stainless steel, anodized aluminum, wet/glass surfaces), light specularly reflects at the same angle as the incident beam — most of the light reflects back into the receiver at an angle that the PSD interprets as 'target at the threshold distance', causing a false trigger.

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