Optical Sensors

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Optical (Photoelectric) Sensors for Industrial Automation

Optical sensors detect objects without contact, whether or not they are made of metal: boxes, parts, labels, transparent items and products moving along a conveyor. They can detect presence and position or count objects. Certain models also detect color or contrast, or suppress background reflections for reliable switching.

How to Choose a Photoelectric Sensor Type

Through-beam: separate transmitter and receiver. Provides long sensing distances and reliable detection, often making it a good choice for fast production lines.
Retro-reflective: sensor and reflector. Convenient to install and generally stable, but reflective or transparent targets and the need for polarization should be considered.
Diffuse-reflective: detects light reflected from the object. Simple to install, but performance depends on the object's color and surface and on the background.
Background suppression: helps prevent false triggering when an unwanted background is present behind the target.

Key Selection Criteria

Sensing distance and area: working distance, light spot size and positioning accuracy.
Target: size, color, reflectivity, transparency or translucency, and speed of movement.
Output and switching logic: PNP/NPN, NO/NC where available, and the required switching frequency.
Connection: cable or connector (often M8/M12) and ease of maintenance.
Operating environment: dust, moisture, condensation, vibration and the required IP rating.

Related Categories

If you need a different detection technology, explore laser sensors or inductive sensors. For a complete selection, see all sensors, sensor accessories, Technical Information and contact us.

Frequently Asked Questions About Optical Sensors

Should I choose a through-beam, retro-reflective or diffuse sensor?

For long sensing distances and reliable detection, consider a through-beam sensor. A retro-reflective sensor is convenient when you can mount a reflector. A diffuse sensor suits simple, short-range applications, but its performance depends on the target surface and background.

How can I detect shiny or transparent objects?

Depending on the target, you may need polarized retro-reflective optics, a sensor designed for transparent objects, background suppression or a through-beam arrangement. Describe the target and operating conditions, and we will help you find a reliable solution.

Do dust and moisture matter?

Yes. Dust and condensation can affect the optics. Choose a suitable IP rating and, where necessary, a sensor type and mounting arrangement that are less sensitive to contamination.

Which output does my PLC need: PNP or NPN?

That depends on the inputs of your PLC or I/O module. If you are unsure, send us the model number or input wiring diagram and we will check compatibility.