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Omron EE-SX871 — L-Shaped Slot Sensor, Light-ON
SKU: EE-SX871USD 15.00
EE-SX77/87 slim photomicrosensor, L-shape, 5 mm slot width, NPN open collector, Light-ON, 5 to 24 VDC, pre-wired 2 m cable.
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Product Overview
The Omron EE-SX871 is the L-shaped Light-ON variant of the EE-SX77/87-series slim photomicrosensor family. It is manufactured by Omron Corporation. Hengyixin Automation ships this sensor from our Xiamen warehouse with a 30-day DOA return window and a datasheet PDF included in the box.
The 5 mm slot, GaAs 940 nm infrared LED emitter and phototransistor receiver sit on the two arms of an L-shape, with the optical axis on the inside of the corner. Light-ON means the output transistor turns on (pulls to 0 V for NPN) when the beam is uninterrupted - the indicator LED on top of the case also lights up in this state.
Differential distance is 0.025 mm max - the sensor sees the same target position to within 25 micrometres run-to-run. Key specs: Model EE-SX871; Slot Width 5 mm; Shape L-shaped (emitter on one arm, receiver on the perpendicular arm); Operating Mode Light-ON (output ON when beam is uninterrupted); Output Type NPN open collector, 100 mA max; Supply Voltage 5 to 24 VDC +/- 10%, ripple 10% max; Current Consumption 35 mA max; Light Source GaAs infrared LED, 940 nm peak wavelength.
Key Features
- EE-SX77/87-series slim photomicrosensor, L-shape, 5 mm slot width
- 5 to 24 VDC supply, 35 mA current consumption
- Response frequency 1 kHz min, averaging 3 kHz typical
- NPN open-collector output, 100 mA max at 5 to 24 VDC
- SKU: EE-SX871
- Series: EE-SX77/87 slim photomicrosensor (non-modulated)
- Voltage: 5 TO 24 VDC
Best-Fit Applications
- Toner cartridge or label position verification on a small printer.
- Tape-and-reel parts counting as each carrier passes through the slot.
- Detecting small opaque parts on an indexing dial or parts feeder.
Buying Checklist
- Confirm the operating mode is Light-ON - for Dark-ON on the same L-shape, choose EE-SX870 instead.
- Choose EE-SX871P (PNP) when the downstream counter or PLC needs a sourcing output instead of NPN.
- Choose EE-SX872 for the same Light-ON logic but a T-shape, where the optical axis is straight through one arm.
Technical Specifications
| Model | EE-SX871 |
|---|---|
| Series | EE-SX77/87 slim photomicrosensor (non-modulated) |
| Slot Width | 5 mm |
| Shape | L-shaped (emitter on one arm, receiver on the perpendicular arm) |
| Operating Mode | Light-ON (output ON when beam is uninterrupted) |
| Output Type | NPN open collector, 100 mA max |
| Supply Voltage | 5 to 24 VDC +/- 10%, ripple 10% max |
| Current Consumption | 35 mA max |
| Light Source | GaAs infrared LED, 940 nm peak wavelength |
| Response Frequency | 1 kHz min, averaging 3 kHz typical |
| Connection | Pre-wired 2 m vinyl-insulated round cable, 3 cores |
| Dimensions / Rating | PBT housing, IP60, -25 to +55 degC operating, approx 20 g |
FAQ for EE-SX871
What is the difference between EE-SX870 and EE-SX871?
Both are L-shaped 5 mm slot photomicrosensors in the EE-SX77/87 family. The SX870 is Dark-ON (output ON when the beam is interrupted); the SX871 is Light-ON (output ON when the beam is uninterrupted). The SX870A reverses the indicator logic - the LED turns on when the beam is interrupted. Pick SX870 for through-beam missing-part detection; pick SX871 for through-beam present-part detection.
What are the wire colours on the EE-SX871?
The pre-wired 2 m cable has three cores: brown for Vcc (5 to 24 VDC), blue for GND (0 V), and black for the NPN output (open collector, 100 mA max). The black wire pulls to near 0 V when the beam is uninterrupted and floats (high impedance) when interrupted. Tie the black wire to the PLC's DC input through a 4.7 kohm pull-up if the PLC needs an active-high signal.
Can the EE-SX871 be panel-mounted?
Yes - the EE-SX871 has two M3 mounting holes on the L-shape body, one on each arm, plus the slim PBT housing slides into a 5 mm slot cut into a panel for through-panel mounting. Tighten the M3 screws to 0.49 N.m max. Do not overtighten - the PBT case can crack under high torque.
How small an object can the EE-SX871 detect?
The minimum detectable object is 2 x 0.8 mm opaque - a small rectangle that fully blocks the 5 mm slot. For sub-millimetre detection, use an EE-SX674 slot sensor with the WR (robotic cable) suffix or a fibre-optic E32 amplifier. The differential distance is 0.025 mm max, so the sensor sees the same position to within 25 micrometres run-to-run.
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