Products catalog

  • Photoelectric limited reflection sensor | 25mm | 21,8x14,5x8,4mm | 10–30VDC | NO | NPN | 2m cable | ABS | red light beam | IP65

    Code: PST-SR25DNOR

    The photoelectric limited reflection sensor is a high-quality solution for object detection at short distances where high precision and stability are required.
    The sensor uses a focused red LED beam, allowing it to detect even very small objects.

    Thanks to limited reflection technology, this model provides extremely stable operation, detecting only objects within a specific range and thus reducing false signals caused by background lighting or nearby surfaces.
    Made of durable ABS housing with a PMMA lens, it offers IP65 protection against dust and moisture, making it suitable for use even in demanding environments. 

  • Technical Specifications

    Detection type: Limited reflection
    Detection distance: 2…25 mm (non-adjustable)
    Blind zone: < 2 mm
    Minimum detectable object: 0.1 mm copper wire (at 10 mm distance)
    Hysteresis (return difference): < 20%
    Light source: Red light (640 nm)
    Output type: NPN, NO
    Response time: < 1 ms
    Power supply voltage: 10…30 V DC
    Operating current: ≤ 15 mA
    Load current: ≤ 50 mA
    Voltage drop: ≤ 1.5 V
    Protection: Short-circuit, reverse polarity, overload protection
    Indicators: Green LED – power/stability indicator; Yellow LED – output signal
    Light interference resistance: Sunlight ≤ 10,000 lux; Lamp light ≤ 3,000 lux
    Operating temperature: -20…+55 °C
    Storage temperature: -30…+70 °C
    Protection rating: IP65
    Housing: ABS plastic
    Lens: PMMA
    Connection: 2 m PVC cable
    Package contents: 2 × M3×16 mm screws, 2 nuts, user manual
    Testing conditions: 100×100 mm white card used (reflectivity >90%)

    Functions and Operating Principle

    The sensor operates on the principle of focused limited reflection — the light beam is emitted toward an object and returns to the receiver only when the object is within a specific limited range.
    It allows precise detection of nearby objects while avoiding false signals from background surfaces.
    A fast response time ensures suitability for high-speed production lines, robotics, or small component inspection processes.
    Integrated protections guarantee long service life and safe operation.

    Applications

    For home users or hobbyists: Suitable for object detection in workshops or DIY automation projects.
    For engineers/automation specialists: Used in high-precision manufacturing systems, robotics, packaging machinery, part position detection, or micromechanical projects where short range and high sensitivity are required.
    For electricians/technicians: Easy installation with included screws and nuts. Clear LED indicators help quickly verify sensor status during setup or testing. Standard 10–30V DC supply allows seamless integration into existing control systems.

    Advantages

    Accurate detection

    Focused red LED beam – clear and stable operation

    Detects objects as small as 0.1 mm

    Fast response time

    IP65 protection – resistant to dust and moisture

    Easy installation with included hardware

    LED indicators – clear operational status

    Integrated protections

    Disadvantages

    Limited performance on very dark or shiny surfaces 

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.
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