Omron E3Z-T81 2M Compact Photoelectric Sensor

USD 35.65

15m through-beam sensor with 1ms response, PNP output, and IP67 protection. Reliable infrared detection for harsh industrial and outdoor environments.

SKU Omron-E3Z-T81 2M Category
Photoelectric Sensors

Omron E3Z-T81 2M Compact Photoelectric Sensor

Model Identifier E3Z-T81 2M
Official Part Number E3Z-T81 2M
GTIN Standard 4549734446457

Technical Overview

The Omron E3Z-T81 2M is a compact, high-performance photoelectric sensor featuring a built-in amplifier and a through-beam sensing method. It delivers an exceptional sensing distance of up to 15 meters using an 870 nm infrared LED light source. Housed in a durable PBT polymer enclosure with an IP67 protection rating, this sensor is engineered to withstand harsh industrial environments, including exposure to water and dust. It provides a reliable PNP open collector output with selectable Light-ON or Dark-ON operation modes. Operating on a 12 to 24 VDC power supply, the unit comes pre-wired with a 2-meter cable for versatile mounting and seamless integration into factory automation systems. The sensor also features excellent ambient light immunity, making it highly reliable even under intense lighting conditions.

Key Features

  • Long-range through-beam detection spanning up to 15 meters
  • High-intensity Infrared LED light source (870 nm)
  • Selectable Light-ON or Dark-ON operation modes for flexible logic control
  • Superior immunity to ambient light (up to 10,000 lux for sunlight) and electrical noise
  • Rugged IP67-rated PBT housing suitable for harsh washdown environments
  • Pre-wired with a 2-meter cable for straightforward installation
  • Ultra-fast response time of 1 ms maximum for high-speed applications
  • Compact cuboid design ideal for space-constrained machine mounting

Industry-leading 15-meter through-beam sensing distance with high ambient light immunity up to 10,000 lux.

Technical Specification Matrix

ParameterValue
Sensing MethodThrough-beam
Sensing Distance15 m
Output TypePNP
Operating ModeLight-ON / Dark-ON (Selectable)
Light SourceInfrared LED (870 nm)
Power Supply Voltage12 to 24 VDC ±10% ripple (p-p) 10% max.
Current Consumption35 mA max. (Emitter: 15 mA max., Receiver: 20 mA max.)
Response Time1 ms max.
Connection MethodPre-wired, 2 m cable
Degree of ProtectionIP67
Material (Housing)PBT (Polybutylene Terephthalate)
Ambient Temperature-25°C to +55°C

Industrial Applications

1. Automated Pallet and Bulk Packaging Conveyor Routing

In large-scale logistics and warehousing facilities, heavy pallets and bulk packages traverse extensive conveyor networks. The Omron E3Z-T81 2M is deployed across wide conveyor gaps or aisle intersections where standard diffuse sensors fail to span the distance. The sensor's extended 15-meter range reliably confirms the presence or absence of oversized cargo crossing these transfer zones, triggering PLC routines for routing, gating, or collision avoidance without requiring complex mid-span wiring.

Problem Solved

Resolves the issue of unreliable detection across wide-span industrial conveyors where distance limitations and ambient dust interfere with standard diffuse or retro-reflective sensors.

Through-beam15m sensing distancePNP outputIP6712-24 VDC

2. Outdoor Gantry and Crane Perimeter Monitoring

Gantry cranes in port terminals or lumber yards operate in challenging outdoor environments. The sensor establishes an active photoelectric beam across the crane's operational perimeter or loading bays. Due to its superior sunlight immunity (up to 10,000 lux) and IP67 weather-resistant PBT housing, it provides consistent trip-wire signals to safely stop the machinery if vehicles or personnel obstruct the danger zone.

Problem Solved

Eliminates false triggering or blinding of standard optical sensors caused by intense outdoor sunlight or adverse weather conditions like rain and dust.

10,000 lux sunlight immunityIP67 protectionInfrared LEDPBT housing

3. Heavy Automotive Assembly Line Positioning Verification

Within automotive manufacturing plants, massive chassis and engine blocks pass through robotic welding and painting cells. Two sets of the E3Z-T81 2M are positioned on opposite sides of the cell to verify that the robotic lift has fully engaged the chassis. The through-beam configuration perfectly cuts through welding fumes and paint mist, while the 1 ms response time instantly relays precise alignment coordinates to the control system via the PNP interface.

Problem Solved

Prevents false sensor readings caused by airborne particulate matter (fumes, mist) which typically scatter light in reflective sensor setups, ensuring exact robotic timing and coordination.

Through-beam sensing method1 ms response timePNP open collectorSelectable Light-ON/Dark-ON
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