What Type of Photoelectric Sensors Are Best For Me?

There are many different styles of photoelectric sensors, but really only four basic technologies: through-beam, reflective, diffuse, and background suppression. The chart describes some advantages and disadvantages of each technology. To learn more about AutomationDirect’s photoelectric sensors visits www.AutomationDirect.com/photoelectric.

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Through-beam

Advantages:

• Most accurate
• Longest sensing range
• Very reliable

Disadvantages:

• Must install at two points on system: emitter and receiver
• Costly – must purchase both emitter and receiver

Reflective

Advantages:

• Cost less than through-beam
• Only slightly less accurate than through-beam
•  Sensing range better than diffuse
• Very reliable

Disadvantages:

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• Must install at two points on system: sensor and reflector
•  Slightly more costly than diffuse
• Sensing range less than through-beam

Diffuse

Advantages:

• Only install at one point
•  Cost less than through-beam or reflective

Disadvantages:

•  Less accurate than through-beam or reflective
• More setup time involved

Background Suppression

Advantages:

• Effective with reflective
  backgrounds

Disadvantages:

• Cost more than diffuse, reflective or through-beam
• Most setup time required

To read more articles about discrete sensing, click here.

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