Editorial Technical Reference

Photo-eye Sensors

This page explains how Photo-eye Sensors is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Non-contact optical sensors that detect the presence, absence, or position of objects on an induction conveyor using light beams.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Photo-eye Sensors

Definition
Photo-eye sensors are critical components of induction conveyor systems that use light emission and reception to detect objects on the conveyor line. They provide precise object detection for automated control of conveyor operations, including start/stop functions, object counting, positioning verification, and jam detection. These sensors enable the conveyor system to respond to the presence or absence of materials without physical contact. The sensors typically consist of a transmitter that emits a light beam (infrared, red, or laser) and a receiver that detects the beam. When an object interrupts the beam, the sensor sends a signal to the control system, triggering appropriate actions. Some models use reflective principles, where the transmitter and receiver are housed together, detecting light reflected from objects or background surfaces. Photo-eye sensors are available with various specifications, including detection ranges from 0.1 to 15 meters, response times from 0.5 to 10 milliseconds, supply voltages from 10 to 30 V DC, and output currents from 100 to 200 mA. They operate in temperatures from -25 to 55 °C and have an enclosure rating of IP67, indicating dust-tight and waterproof protection. The light source is typically a visible red laser or LED at 650 nm. Connection is via a 4-pin M12 connector or cable. Housing materials include polycarbonate and glass fiber reinforced PBT, with stainless steel mounting brackets and optical glass lenses. Weights range from 50 to 200 grams. These sensors are designed for use in industrial environments and are suitable for various conveyor applications. It is essential to verify model-specific values and standards with the legal manufacturer or supplier before selection and installation.
Working Principle
Photo-eye sensors operate by emitting a light beam from a transmitter and detecting it with a receiver. When an object interrupts the beam, the change in light reception triggers a signal to the conveyor control system. Some models use reflective principles, where the transmitter and receiver are in the same housing, detecting light reflected from objects or background surfaces. The sensor's output (NPN/PNP) interfaces with the control system to initiate actions such as stopping the conveyor or counting objects.
Common Materials
Polycarbonate housing, Stainless steel mounting brackets, Optical glass lenses, Electronic circuit boards
Technical Parameters
ParameterTypical rangeNotes & selection driver
Detection Range0.1–15 mDepends on model and reflector
Response Time0.5–10 msFaster for high-speed conveyors
Supply Voltage10–30 V DCReverse polarity protected
Output Current100–200 mAMax load for NPN/PNP output
Operating Temperature-25–55 °CExtended range available
Enclosure RatingIP67Dust-tight and waterproofIEC 60529
Light Source650 nmVisible red laser or LED
Connection TypeM124-pin connector or cable
Housing MaterialPBTGlass fiber reinforced
Weight50–200 gDepends on housing and cable

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Transmitter Unit
    Emits the light beam for object detection
    Material: Polycarbonate housing with optical glass lens
  • Receiver Unit
    Detects the light beam and converts it to electrical signals
    Material: Polycarbonate housing with photodiode/transistor
  • Mounting Bracket Part
    Secures the sensor to the conveyor frame at precise positions
    Material: Stainless steel or aluminum
  • Signal Processing Circuit
    Processes detection signals and controls output to conveyor system
    Material: Printed circuit board with electronic components

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Photo-eye Sensors.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric (non-pressurized applications)
other spec: Sensing range: 0.1m to 20m (depending on model), Response time: 0.5ms to 10ms, Light source: Infrared (850-950nm) or visible red (650nm), Protection rating: IP67/IP69K for washdown environments
temperature: -20°C to +70°C (operating), -40°C to +85°C (storage)
Media Compatibility
✓ Plastic packaging materials ✓ Metal machine parts ✓ Transparent glass containers
Unsuitable: High-vibration environments with misalignment risk
Sizing Data Required
  • Required sensing distance (mm)
  • Object size and detection resolution (mm)
  • Conveyor speed and required response time (m/s, ms)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Lens Contamination
Cause: Accumulation of dust, dirt, or moisture on the lens surface, obstructing the light beam and causing false readings or signal loss.
LED Degradation
Cause: Gradual reduction in light output due to aging of the emitter or receiver LEDs, often accelerated by excessive heat, voltage spikes, or prolonged operation beyond rated cycles.
Maintenance Indicators
  • Intermittent or erratic object detection despite clear line of sight
  • Visible accumulation of debris, condensation, or physical damage on the sensor lens or housing
Engineering Tips
  • Implement regular cleaning schedules using appropriate, non-abrasive methods and ensure proper sealing or purging in dusty or humid environments to prevent lens contamination.
  • Install surge protection devices and ensure stable, within-specification power supply to protect internal electronics from voltage fluctuations and thermal stress.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 13849-1: Safety of machinery - Safety-related parts of control systems ANSI/UL 508: Standard for Industrial Control Equipment IEC 61496-1: Safety of machinery - Electro-sensitive protective equipment - Part 1: General requirements and tests

Quoted from the published standard.

Manufacturing Precision
  • Alignment accuracy: +/- 0.5 degrees
  • Response time: +/- 10 milliseconds
Quality Inspection
  • Environmental sealing test (IP rating verification)
  • Optical performance test (light intensity and beam alignment verification)

Manufacturers of Photo-eye Sensors

6 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Cheemi Technology Co. Ltd.
Nanjing, Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Dongguan Dadi Electronic Technology Co., Ltd.
Guangdong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Greegoo Electric
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
HEBAI
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
MIYO TS Heater Co., Limited
Taiwan, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Shanghai Sunshine Technologies Co., Ltd.
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Frequently Asked Questions

What is the typical detection range of photo-eye sensors?

The detection range depends on the model and reflector, typically from 0.1 to 15 meters. Always verify the specific range for your application with the manufacturer.

What is the response time of these sensors?

Response time ranges from 0.5 to 10 milliseconds, with faster times suitable for high-speed conveyors. Confirm the exact response time for your model.

What is the enclosure rating?

The enclosure rating is IP67, meaning the sensor is dust-tight and protected against temporary immersion in water. This rating is per IEC 60529.

What connection types are available?

The sensors typically use a 4-pin M12 connector or cable. Ensure compatibility with your control system's wiring.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.
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