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Red rectangular photoelectric retro-reflective sensor with PNP output

Sick

Sick L8-P2231 Photoelectric retro-reflective sensor PNP

SKU CH-9B3E-3QK8A

Photoelectric retro-reflective sensor with PNP output for object detection

  • Labor warranty1 Year
  • Product typeTest Equipment
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Retro-reflective sensing simplifies alignment with a single sensor unit
  • PNP output switches positive voltage for direct PLC integration
  • Red housing aids quick visual identification on the machine
  • Sick brand ensures industrial-grade reliability for automation tasks
  • Supplied as a single unit in a box for immediate installation

Purpose and application

The Sick L8-P2231 is a photoelectric retro-reflective sensor with a PNP output designed for industrial detection tasks. It belongs to the electrician tools category and functions as test equipment for automation and control systems. The sensor uses a red light emitter to detect objects by reflecting light back from a separate reflector. This unit is sold new in a single pack.

Upgrade context

This sensor replaces older mechanical limit switches or diffuse-mode sensors where a retro-reflective method offers longer range and simpler alignment. The jump is worth it when an application requires a polarised retro-reflective principle to ignore shiny targets or when a PNP switching logic matches the existing PLC input card. The three-year parts and one-year labour coverage supports scheduled maintenance planning.

Suitability

The device suits automation engineers and maintenance technicians who need a compact, PNP-output sensor for presence detection on conveyors, packaging lines or material-handling equipment. It is not for buyers who require an NPN output type or a through-beam configuration with separate emitter and receiver units. Users needing built-in background suppression or laser-class precision should evaluate alternative sensing principles.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $155.99
Pricier than about 70% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSick
Model nameSICK L8-P2231
Product typeTest Equipment
Color and finishRed
In the box
Number of items1 pack

Questions about this item

What mounting pattern does the SICK L8-P2231 sensor use?

The sensor uses the standard L8 series mounting footprint with two M4 holes.

Which wiring step is most often missed when installing this PNP retro-reflective sensor?

Connecting the load between the black output wire and 0 V is the step installers most frequently omit.

When should the reflector for the L8-P2231 be cleaned or replaced?

Clean the reflector whenever dust or residue reduces the sensing range; replace it if the surface becomes scratched or clouded.

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