Omron E3ZG-LS61-DO NPN Dark-ON TOF Sensor

USD 44.68

Omron E3ZG-LS61-DO is an NPN Dark-ON TOF photoelectric sensor with a 50–900 mm range, 2 m cable and IP65 protection.

SKU Omron-E3ZG-LS61-DO Category
Omron Photoelectric Sensors

Omron E3ZG-LS61-DO TOF Laser Sensor

BrandOmron
Model IdentifierE3ZG-LS61-DO
Official Part NumberE3ZG-LS61-DO

Technical Overview

The Omron E3ZG-LS61-DO is a reflective laser sensor that uses time-of-flight sensing to switch according to target distance. Its documented setting range is 50–900 mm, with a 940 nm infrared laser classified as IEC Class 1. The NPN open-collector output has fixed Dark-ON operation and supports a load current up to 100 mA. Two-point teaching establishes the switching setting for the application. Operate and reset times are each 100 ms maximum, making dwell time an important part of the machine sequence. A standard 2 m pre-wired connection and IP65 protection support installation with local indicator feedback.

50–900 mm TOF laser sensor with NPN Dark-ON output and two-point teaching.

Key Features

  • Time-of-flight reflective detection
  • 50–900 mm setting range
  • 940 nm infrared laser; IEC Class 1
  • NPN open-collector output
  • Dark-ON fixed operation
  • Two-point teaching
  • 100 ms maximum operate/reset response
  • 100 mA maximum load current
  • Standard 2 m pre-wired connection
  • IP65 protection

Set a distance-based detection point with two-point teaching and obtain NPN Dark-ON switching feedback.

Technical Specification Matrix

ParameterValue
Sensing methodReflective, time-of-flight (TOF)
Sensing distance50–900 mm setting range with 200 × 200 mm white paper; detection from 50 mm to the setting distance
OutputNPN open collector
Operation modeDark-ON; fixed by model
Light sourceInfrared laser diode, 940 nm
Laser classIEC Class 1
Power supply10–24 VDC, including ripple peak-to-peak 10%; Class 2 supply
Current consumption20 mA maximum
Load rating100 mA maximum; load supply 26.4 VDC maximum
Residual voltage1 V maximum below 10 mA load; 2 V maximum at 10–100 mA
Response timeOperate and reset: 100 ms maximum each
Distance adjustmentTwo-point teaching
Protection circuitsSupply reverse-polarity; output short-circuit; output reverse-polarity protection
Ambient lightSunlight: 10,000 lx maximum
Operating temperature-20 to +55 °C; no icing or condensation
Storage temperature-40 to +70 °C; no icing or condensation
Operating humidity35–85% RH; no condensation
Storage humidity35–95% RH; no condensation
IP ratingIP65 (IEC 60529)
IndicatorOrange operation and green stability/communication indicators
ConnectionPre-wired; standard 2 m cable
HousingABS
Lens materialPMMA
Display materialPET
Hysteresis50–100 mm: 18 mm maximum; 100–900 mm: 20% of sensing distance maximum
Black-white error10% of setting distance maximum, at 900 mm setting
Spot diameterApproximately 116 mm at 900 mm; reference value
Insulation resistance20 MΩ minimum at 500 VDC
Dielectric strength1,000 VAC, 50/60 Hz, 1 minute
Vibration resistance10–55 Hz; 1.5 mm double amplitude; 2 hours per axis
Shock resistance500 m/s²; 3 times per axis
AccessoriesInstruction manual and compliance sheet; mounting accessories sold separately

Industrial Applications

1. Carton positioning at a conveyor stop

A conveyor stop holds a carton while downstream equipment completes its operation. The sensor observes the carton surface within the 50–900 mm setting range and uses TOF sensing to distinguish the occupied stop from the more distant background. Two-point teaching establishes the operating setting, and the NPN output reports the condition after the documented 100 ms maximum switching interval.

Problem Solved

Provides a distance-based occupied-stop signal, allowing the conveyor sequence to release or retain the waiting carton without a mechanical switch contacting its surface.

Conveyor positioning 100 ms response

2. Component seating in an assembly fixture

An assembly fixture presents a component at a repeatable working position before a process step. The sensor faces a suitable component surface and distinguishes its distance from that of the empty fixture. Two-point teaching supports setting the detection point, while the fixed Dark-ON output provides the defined switching logic for a compatible machine input during the fixture dwell.

Problem Solved

Separates the loaded component position from the empty fixture by distance, supplying a noncontact seating condition that the machine can use before starting its assembly operation.

Fixture seating Dark-ON

3. Stack height threshold monitoring

A stacking station builds a pile of flat opaque products beneath an overhead sensing position. As the stack grows, its top surface moves toward the sensor and crosses the taught distance threshold. The 50–900 mm setting range supports positioning above the stack, and the NPN switching output supplies a threshold condition after the stack has settled for the required response interval.

Problem Solved

Converts a changing stack-to-sensor distance into a discrete height-threshold signal, helping the transfer sequence request stack removal or stop adding material at the selected level.

Stack height threshold TOF sensing
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