Omron E3FA-TN21 2M — 15 m Through-Beam Sensor, NPN
SKU: E3FA-TN21 2MUSD 18.00
15 m through-beam photoelectric sensor, M18 barrel, ABS body, red LED, NPN output, pre-wired 2 m cable.
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Product Overview
The Omron E3FA-TN21 2M is a through-beam photoelectric sensor set: a red LED emitter and a matching receiver, both in an M18 cylindrical ABS housing, wired back to the cabinet with a 2 m cable. With a 15 m rated range, it gives a clean trigger across wide conveyors, pallet lanes, and door frames where a single-sided diffuse sensor would not reach. The NPN open-collector output drops low when the beam is broken, which is the wiring style Japanese PLCs and most older CJ-series racks expect.
Why pick the pre-wired set
The 2M suffix marks the pre-wired 2 m cable version. The set ships as an emitter and a receiver that are already paired, so the beam is aligned at the factory. Pick this SKU when the control cabinet is close to the sensing point. If you need the 20 m range or want a detachable lead, use the M12-connector E3FA-TN21 instead and add a separate lead.
Choosing the right variant
E3FA-TN21 2M gives you an NPN output on a pre-wired 2 m cable. For a PNP (sourcing) output on the same 15 m range, pick E3FA-TP11 2M. For the 20 m range with a quick-disconnect, look at the connector-style E3FA-TN21 (no 2M) or E3FA-TP21. If the target is glossy or transparent, swap to a polarized retro-reflective sensor such as E3FA-RP11 2M.
Before ordering
Confirm the PLC input is NPN (sinking); for PNP inputs, choose the TP version. Mount the emitter and receiver on a rigid bracket so the beam does not drift, especially on vibrating equipment. The 0.5 ms response handles most conveyor counting. For sub-millisecond timing, move to the E3Z cuboid family.
Key Features
- 15 m through-beam range (pre-wired 2M set)
- M18 cylindrical barrel in ABS housing
- Red LED light source for easy alignment
- NPN open-collector output
- Light-ON / Dark-ON mode switch on the receiver
- Pre-wired 2 m cable to the cabinet
- 0.5 ms response time
- IP67 / IP69K protection for washdown areas
- SKU: E3FA-TN21 2M
- Series: E3FA
- Voltage: 12-24 VDC
Best-Fit Applications
- Pallet and carton presence detection on wide conveyors
- Door and gate beam on automatic storage lines
- Trigger generation at the end of a parts feeder
- Box-height or stack-presence check just before pallet stretch-wrapping
- Long-span detection across packaging or assembly work cells
Buying Checklist
- Choose E3FA-TN21 2M for a 15 m NPN set with a pre-wired 2 m cable.
- Choose E3FA-TP11 2M instead for the same 15 m range with a PNP output.
- Choose E3FA-TN21 (no 2M) for the 20 m range with an M12 connector.
- Choose E3FA-RP11 2M for retro-reflective detection of glossy targets.
- Confirm your PLC input is NPN (sinking) before ordering.
- Allow for space for both emitter and receiver on opposite sides of the beam path.
Technical Specifications
| Series | E3FA |
|---|---|
| Sensing Method | Through-beam (separate emitter and receiver) |
| Sensing Distance | 15 m |
| Light Source | Red LED |
| Output Type | NPN open collector, Light-ON / Dark-ON |
| Connection | Pre-wired 2 m cable |
| Supply Voltage | 12-24 VDC ±10 % |
| Load Current | 100 mA max |
| Response Time | 0.5 ms |
| Protection Rating | IP67 / IP69K |
| Operating Temperature | -25 to +55 °C |
| Housing | ABS, M18 threaded barrel |
Resources & Downloads
FAQ for E3FA-TN21 2M
What's the difference between E3FA-TN21 and E3FA-TN21 2M?
The 2M suffix marks the pre-wired 2 m cable version, with a 15 m sensing range. The plain E3FA-TN21 uses an M12 connector and is rated 20 m. Pick the 2M set when the cabinet is close and you want a fixed cable; pick the M12 version for longer runs or quick swap-out.
Is E3FA-TN21 2M NPN or PNP?
NPN open collector. The output pulls the signal line down to 0 V when the beam is broken and the sensor is in Dark-ON mode. For a PNP (sourcing) output on the same 15 m range, use the E3FA-TP11 2M with the same emitter and receiver.
What cables or accessories are needed?
Nothing else is required. The set ships as a paired emitter and receiver with a 2 m cable. Mounting brackets for M18 sensors (such as the E39-L98 family) are sold separately. For a 20 m range with a quick-disconnect, use the M12 connector version and a separate M12 lead.
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