描述
Long-Distance Through-Beam Detection
E3FA-TN21 20 m Through-Beam Photoelectric Sensor
The XSZ E3FA-TN21 is designed for industrial automation points that need stable long-distance object detection. Its through-beam sensing method uses separate emitter and receiver units, helping detect product passage, machine position and object interruption across wider equipment spaces.
20 m | NPN NO | 10-30 VDC
Reliable Detection Across Longer Machine Gaps
Compared with diffuse reflective sensors, a through-beam sensor is usually preferred when the target may vary in color, surface finish or reflectivity. The E3FA-TN21 detects when the target interrupts the light path between the transmitter and receiver, making it useful for conveyors, packaging machines and material handling lines.
- 20 m sensing distance for long-gap detection points
- NPN normally open output for common DC control circuits
- 10-30 VDC supply voltage for standard industrial automation wiring
- Through-beam structure helps reduce problems caused by target color changes
- Suitable for object passage, position confirmation and safety-related machine indication points
Why Choose E3FA-TN21 for Automation Lines
20 m Through-Beam Sensing
Useful when the sensor must detect objects across a conveyor, machine frame, gate or wide transfer section.
Less Sensitive to Target Color
Because detection is based on beam interruption, many color and reflectivity changes are easier to manage than with diffuse sensing.
Matched to Your Wiring
XSZ can help confirm NPN wiring, cable length, connector, label and packaging details before quotation.
E3FA-TN21 Technical Specifications
| Parameter | Specification |
|---|---|
| Model | E3FA-TN21 |
| Sensor Type | Through-beam photoelectric sensor / photoelectric switch |
| Usage | Industrial automation |
| Supply Voltage | 10-30 VDC |
| Output Configuration | NPN, normally open |
| Sensing Distance | 20 m |
| Mounting Type | M18-style machine mounting |
| Body Color | Black |
| Listed Body Size | 41 x 18 x 1 mm, confirm installation drawing before bulk order |
| Weight | 35 g |
| Customization | Cable length, connector, label and packaging can be evaluated for bulk orders |
Where the E3FA-TN21 Works Well
Use this model when the application needs a clear beam-interruption signal across a longer distance or when target surface conditions are not consistent.
01
Conveyor Object Passage
Detect cartons, trays, boards or parts as they pass between emitter and receiver.
02
Packaging and Sorting Lines
Provide a stable trigger signal for counting, sorting, positioning and line control.
03
Material Handling Equipment
Monitor transfer points, loading zones and machine entrances with a non-contact signal.
04
Machine Position Detection
Confirm arm, fixture or product position where a long optical path is required.
Before Choosing This Sensor
Check the emitter and receiver alignment
Through-beam sensors need clear alignment between the sending and receiving sides. Confirm bracket space, cable direction and machine vibration before installation.
Confirm the electrical input type
This model uses NPN normally open output. Confirm PLC input type, load wiring and cable requirements before ordering.
Send These Details for Fast Selection
- Required sensing distance and available mounting space
- Target size, moving speed and whether the target fully blocks the beam
- PLC input type, NPN wiring method and cable length
- Quantity, connector, label and packaging requirements
Product Questions
Frequently Asked Questions
01
Does the E3FA-TN21 need a reflector?
No. It is a through-beam sensor, so it uses a separate emitter and receiver. The target is detected when it interrupts the light beam.
02
Is it better than diffuse detection?
For long distances or changing target colors, through-beam detection is often more stable because it detects beam interruption instead of reflected light.
03
Can it connect to a PLC?
Yes. Confirm that the PLC input is compatible with NPN normally open wiring before installation.
04
Can XSZ support OEM requirements?
Yes. Send the quantity, cable length, connector, label and packaging requirements for factory evaluation.
Need Pricing or an E3FA-TN21 Sample?
Send the sensing distance, target size, installation space, NPN wiring requirement and order quantity. XSZ will confirm the configuration before quotation.
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