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A-B 871L-D20EP40-N4 Capacitive Proximity Sensor

871L-D20EP40-N4
871L-D20EP40-N4

A-B 871L-D20EP40-N4 Capacitive Proximity Sensor

A-B 871L-D20EP40-N4 Capacitive Proximity Sensor

  • Item NO.:

    871L-D20EP40-N4

  • Payment:

    T/T

  • Price:

    $365

  • Product Origin:

    USA

  • Color:

    NEW

  • Product weight:

    0.01KG

  • Lead Time:

    In stock
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We will arrange delivery within 3-5 days after receiving the payment.

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                                                                                                                                                                                                                                                                    • A-B 871L-D20EP40-N4 Capacitive Proximity Sensor

                                                                                                                                                                                                                                                                      The correct classification is:

                                                                                                                                                                                                                                                                      It is NOT capacitive. It is an inductive proximity sensor.

                                                                                                                                                                                                                                                                      Correct Product Information

                                                                                                                                                                                                                                                                      • Brand: Allen-Bradley (Rockwell Automation)
                                                                                                                                                                                                                                                                      • Series: 871L
                                                                                                                                                                                                                                                                      • Part Number: 871L-D20EP40-N4
                                                                                                                                                                                                                                                                      • Type: Inductive proximity sensor (not capacitive)
                                                                                                                                                                                                                                                                      • Sensing Distance: 20 mm
                                                                                                                                                                                                                                                                      • Housing Size: 40 mm
                                                                                                                                                                                                                                                                      • Output: DC 3-wire, PNP (sourcing), NO/NC selectable
                                                                                                                                                                                                                                                                      • Supply Voltage: 10–60 V DC

                                                                                                                                                                                                                                                                      Working Principle (Simple)

                                                                                                                                                                                                                                                                      This sensor works by:

                                                                                                                                                                                                                                                                      • Generating a high-frequency electromagnetic field
                                                                                                                                                                                                                                                                      • Detecting metal objects only
                                                                                                                                                                                                                                                                      • When metal enters the field → output switches ON

                                                                                                                                                                                                                                                                      So it is strictly a metal detection sensor.

                                                                                                                                                                                                                                                                      Why it is NOT capacitive

                                                                                                                                                                                                                                                                      Capacitive sensors:

                                                                                                                                                                                                                                                                      • detect plastic, liquid, powder, wood
                                                                                                                                                                                                                                                                      • measure dielectric changes

                                                                                                                                                                                                                                                                      This model:

                                                                                                                                                                                                                                                                      • only detects metal reliably
                                                                                                                                                                                                                                                                      • cannot be used for liquid level sensing

                                                                                                                                                                                                                                                                      Typical Applications

                                                                                                                                                                                                                                                                      • Metal part detection on conveyors
                                                                                                                                                                                                                                                                      • Machine position / limit detection
                                                                                                                                                                                                                                                                      • Industrial automation systems
                                                                                                                                                                                                                                                                      • Cylinder / tooling position confirmation

The structure and details of the product：

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