Background Suppression Sensing with Omron's E3Z-LS

Background Suppression Sensing with Omron's E3Z-LS

Rick Cone | September 30th, 2015

Do you have an application where you are trying to sense parts that are similar in color to the conveyor belt they're on (example: green PCB's on a dark conveyor belt). Or are you sensing glossy colored parts on a moving conveyor line (example: candy bars on a conveyor belt).  These are just two examples that can present issues getting consistent part detection because of varying surface and color conditions unless you have the proper sensor for these conditions. 

Omron, a leader in sensing technology and one of the first to offer BGS & FGS in the same sensor. Their E3Z-LS series is a compact Background (BGS) / Foreground (FGS) settable sensor designed to ignore backgrounds or foregrounds which allows for more accurate sensing in tough applications like the ones mentioned above. 

Here's how they work:

Compact Background / Foreground Settable Sensor

Omron's E3Z-LS photoelectric sensor is designed to ignore backgrounds or foregrounds for more accurate sensing situations.

  • detect glossy / uneven surfaces with foreground suppression
  • ignore objects beyond the set distance such as a conveyor belt rail using background suppression
  • web/edge position detection models are available
  • switch-selectable, light-on / dark-on operation
  • NPN or PNP output models are available
  • M8 connector ready or 2m, pre-wired models are available

Background Suppression Sensing (BGS) - what is it?

Eliminate false detection due to highly reflective backgrounds - objects beyond the set distance will not be detected

F = Far, N = Near

bgs sensing


Glossy / Irregular Objects with BGS Sensing:

When to use FGS

  • when there are highly reflective backgrounds
  • when targets are darker than the background
  • targets are close to the background

Foreground Suppression Sensing (FGS) - what is it?

Designed to provide reliable detection of objuects with glossy / irregular surfaces - objects before the set distance will not be detected

F = Far, N = Near


Glossy / Irregular Objects with FGS Sensing:

When to use FGS

  • targets with shiny or irregular surfaces
  • no space for a reflector
  • application that require short sensing distance (max 8")

Sensing applications can be tricky - we would be happy to discuss your application.

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