Omron E3Z-LL61 — BGS Laser Sensor, 300 mm, NPN, 2 m
SKU: E3Z-LL61USD 34.00
Compact laser photoelectric sensor with distance-settable (BGS / background-suppression) sensing, 20 to 300 mm range on white paper, 20 to 160 mm on black paper, NPN output, pre-wired 2 m PVC cable. 1 ms response time. Visible red laser Class 1.
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Product Overview
The E3Z-LL61 is the NPN-output member of the E3Z-LL family of compact laser photoelectric sensors with distance-settable (BGS = Background Suppression) technology. 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.
Where the E3Z-LL61 fits in the E3Z family
The E3Z family splits along two axes: emitter type (LED = E3Z-D, laser = E3Z-L) and sensing principle (diffuse = D, retro-reflective = R, through-beam = T, distance-settable = L). The E3Z-LL is the laser BGS branch — the premium tier for precision small-target detection. Within the LL family: E3Z-LL61 (NPN pre-wired 2 m — this SKU), E3Z-LL66 (NPN M8 4-pin connector), E3Z-LL63 (NPN M8 connector with extended range), E3Z-LL68 (NPN M8 connector with extended range), E3Z-LL81 (PNP pre-wired 2 m — this SKU's PNP sibling), E3Z-LL86 (PNP M8 4-pin connector), E3Z-LL83 (PNP M8 connector extended), E3Z-LL88 (PNP M8 connector extended).
BGS technology vs standard diffuse-reflective
The E3Z-LL61's BGS principle solves a fundamental limitation of standard diffuse-reflective sensors (E3Z-D8x): they cannot distinguish between a target close to the sensor and a target far away — both return signal. On a conveyor with parts of varying height, a diffuse sensor might detect a tall part standing 200 mm away and a short part at 50 mm as the same signal level. The BGS sensor's PSD detects the angle of the returned light — closer targets reflect light at a different angle than farther targets — and compares this to the threshold set by the potentiometer.
Sensitivity adjustment, laser safety, and target material
The 6-turn potentiometer on the rear face sets the detection threshold. With the target at the desired detection distance, rotate the trimmer counter-clockwise (decrease threshold) until the yellow indicator just turns OFF (sensor no longer detects the target). Then rotate clockwise (increase threshold) until the indicator just turns ON. 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
- Compact laser photoelectric sensor with BGS technology
- Distance-settable detection threshold: 40 to 300 mm white paper, 40 to 160 mm black paper
- Visible red laser spot — 0.5 mm diameter for precision targeting
- NPN normally-open output
- Pre-wired 2 m PVC cable
- 12 to 24 VDC ±10 % operating voltage
- 30 mA current consumption max
- 100 mA max switching current
- SKU: E3Z-LL61
- Series: E3Z-L Compact Laser Photoelectric Sensor (BGS / Distance-settable)
- Voltage: 24 VDC
- I/O: 61 I/O
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.
- Small-bottle counting on a pharmaceutical line — E3Z-LL61 detects 10 mm-diameter vials passing at 200 mm distance on a conveyor.
Buying Checklist
- Pick E3Z-LL61 for laser BGS sensor with NPN pre-wired 2 m cable and 300 mm max range
- Pick E3Z-LL81 for PNP output sibling
- Pick E3Z-LL66 / LL68 for NPN M8 4-pin connector version
- Pick E3Z-LL63 / LL83 for extended-range variant
- Pick E3Z-LS61 for LED-based BGS at 10-100 mm range
- Pick E3Z-D82 for diffuse-reflective at 1 m range with red LED — pick when background-suppression is not needed and longer range is required
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) |
Resources & Downloads
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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