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Omron E3T-ST11 2M ultra-thin through-beam photoelectric sensor pair in the shipping carton with the type label visible

Omron E3T-ST11 2M — 1 m Ultra-Thin Through-Beam, NPN

SKU: E3T-ST11 2M

USD 26.00

Ultra-thin ultra-compact through-beam photoelectric pair in 20 x 12 x 31 mm ABS housing, 1 m range, NPN output, 12-24 VDC, 2 m pre-wired cable.

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Product Overview

The Omron E3T-ST11 2M is the Light-ON half of the E3T through-beam pair — an emitter and a receiver shipped in matched ultra-thin ABS housings, each 20 mm wide x 12 mm tall x 31 mm long, with 2 m pre-wired leads. The pair covers 1 m on a 2 mm opaque target and runs from a single 12 to 24 VDC supply. The head is small enough to mount inside a feeder track, a slide gate, or a small-part escapement where a standard M18 through-beam barrel physically does not fit.

What the Light-ON / Dark-ON choice actually means

The ST11 is Light-ON — its NPN output conducts when the emitter's red 650 nm beam reaches the receiver (no target in the gap). The ST12 is the identical sensor in Dark-ON mode (output ON when the beam is broken). Pick ST11 for a 'beam intact = run, beam broken = stop' arrangement such as a safety gate monitor. Pick ST12 for the more common 'part present = output on' wiring on a conveyor or pickup station. Both halves draw DC 12-24 V and carry 50 mA sink loads.

When to use the E3T over a bigger through-beam

Pick the E3T when the bracket or the panel cutout physically cannot take an M18 barrel (E3FA-TP11 2M at 15 m) or a square M18 cube (E3S series). The 1 m range is the headline sacrifice — the E3T is a tight-space sensor, not a long-distance beam. If the install is wider than 1 m and you need a small head, the E3T-ST13 covers 5 m in the same ultra-thin housing. For reflective (single-head) mounts the E3T-FD11 covers up to 100 mm diffuse-reflective and the E3T-FL22 covers 5-30 mm BGS-style convergent-reflective in the same slim line.

Before ordering

Order one SKU and you get a matched emitter + receiver pair. Confirm the supply is regulated 12 to 24 VDC and the load does not exceed 50 mA at 26.4 VDC (the NPN open-collector sink). Pre-wired 2 m is fine for most panel-mount installs; for M12 or M8 quick-disconnects, the E3T-ST11-M1TJ and E3T-ST11-M3J ship with pigtails at the same 1 m range.

Key Features

  • E3T-series ultra-thin / ultra-compact through-beam photoelectric sensor (matched pair)
  • 1 m sensing range on 2 mm dia. or larger opaque target
  • Light-ON detection (NPN output ON when beam reaches receiver); ST12 is the Dark-ON sibling
  • Red pinpoint LED 650 nm source for visible alignment
  • NPN open-collector output, 50 mA max at DC 26.4 V
  • Output residual voltage 1 V or less
  • 1 ms or less response time
  • DC 12 to 24 V +/-10 % supply, ripple 10 % max
  • Built-in load short-circuit, output reverse-connection, and power-supply reverse-polarity protection
  • Ultra-thin ABS housing 20 (W) x 12 (H) x 31 (D) mm, ~15 g each half, orange operation LED
  • Pre-wired 2 m cable, IP67 rated, -25 to +55 deg C operating (storage -40 to +70 deg C)
  • Ambient light immunity: incandescent 5,000 lx / sunlight 10,000 lx max
  • SKU: E3T-ST11 2M
  • Series: E3T ultra-thin / ultra-compact photoelectric sensor
  • Voltage: 12 TO 24 V
  • I/O: 50 I/O

Best-Fit Applications

  • Small-part detection inside a feeder track or escapement where M18 barrels cannot fit
  • Vibratory bowl outlet trigger where the sensor head mounts between bowl and slide
  • PCB-component presence check at a pick-and-place station with a 10-50 mm gap
  • Label or edge detection on a small diameter roller where the gap is well under 1 m
  • Verification of syringe / pen / pen-cap presence in a tight packaging cell
  • Light-curtain-like beam at a small machining cell entrance where a full safety relay is not required

Buying Checklist

  • Pick E3T-ST11 2M for a Light-ON 1 m ultra-thin through-beam pair on a 2 m pre-wired lead.
  • Pick E3T-ST12 2M instead for the same 1 m range and housing in Dark-ON mode (more common on conveyors).
  • Pick E3T-ST13 for the same ultra-thin head at 5 m long range when the gap is wider.
  • Pick E3T-ST11-M1TJ (or -M3J) when you need an M12 (or M8) quick-disconnect pigtail rather than a pre-wired lead.
  • Do NOT confuse E3T with E3X fiber-optic amplifiers and E32 fibers — E3T is a self-contained through-beam pair, not a fiber amp.
  • Confirm the load is NPN sink and the supply is regulated 12-24 VDC; voltage above 26.4 VDC will damage the receiver.

Technical Specifications

Model E3T-ST11 2M (matched emitter + receiver pair)
Series E3T ultra-thin / ultra-compact photoelectric sensor
Sensing Method Through-beam (separate emitter and receiver)
Sensing Distance 1 m on 2 mm opaque target or larger
Min Target Opaque object 2 mm dia. or larger
Light Source Red LED 650 nm (visible pinpoint spot)
Detection Mode Light-ON (Dark-ON is the E3T-ST12 sibling)
Output Type NPN open collector, 50 mA max at 26.4 VDC, residual 1 V max
Response Time 1 ms or less (operate and reset)
Supply Voltage DC 12 to 24 V +/-10 %, ripple 10 % max
Current Draw Emitter 10 mA or less / receiver 20 mA or less
Protection Load short-circuit, output reverse-connection, supply reverse-polarity
Housing ABS ultra-thin, 20 (W) x 12 (H) x 31 (D) mm
Mass Emitter ~15 g / receiver ~15 g
Indicator Orange operation LED on receiver top
Connection Pre-wired 2 m cable (emitter 2-core, receiver 3-core)
Ingress Rating IP67 (IEC 60529)
Ambient Light Incandescent 5,000 lx or less; sunlight 10,000 lx or less
Operating Temperature -25 to +55 deg C
Storage Temperature -40 to +70 deg C
Humidity 35 to 85 % operating / 35 to 95 % storage
Dielectric Strength AC 1000 V, 50/60 Hz, 1 min between current-carrying parts and case
Approvals UL, CE

FAQ for E3T-ST11 2M

Is the E3T-ST11 2M a fiber-optic sensor?
No. The E3T is a self-contained ultra-thin through-beam photoelectric pair with built-in emitter and receiver. It is not a fiber-optic amplifier and does not accept E32-series fiber-optic cables. If you need a fiber-optic amplifier to read a remote through-beam or reflective fiber head, look at the E3X-NA41 2M (NPN fiber amp) or the E3X-SD / E3X-HD high-function amplifiers instead.
What is the difference between E3T-ST11 and E3T-ST12?
Both are 1 m range, NPN output, ultra-thin through-beam pairs with the same head and cable. ST11 is Light-ON (output conducts when the beam reaches the receiver, no target in the gap). ST12 is Dark-ON (output conducts when the beam is blocked by a target). Most conveyor and pick-and-place applications need Dark-ON (ST12); safety gates and 'beam intact = run' setups use Light-ON (ST11). Same supply, same load, same response, same head — only the logic is flipped.
How small an object can E3T-ST11 detect?
The standard target rating is opaque 2 mm dia. or larger at the rated 1 m range. Smaller targets may pass through the beam without blocking enough light to register reliably, especially at the far end of the range. For very small targets (under 2 mm) close to the receiver, switch to the E3T-FL22 convergent-reflective sensor with a 5-30 mm focal range and a focused spot.
Can I extend the E3T-ST11 2M cable?
Yes, with a normal 2-core (emitter) or 3-core (receiver) shielded cable. Keep the run under around 10 m or the residual voltage plus cable impedance starts to lift and the NPN output may not close reliably at the rated 26.4 VDC. For longer runs, switch to the E3T-ST11-M1TJ (M12 4-pin) or E3T-ST11-M3J (M8 4-pin) variant and use a standard sensor extension cordset.

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