UC-300C..7 datasheet(4/14 Pages) ETC

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Diffuse Mode Alignment

Object

If the Alignment LED does not turn OFF when the object is

removed from the beam, the sensor is probably detecting light

reflected from some background object. To remedy this problem:

•

Reduce the reflectivity of the background by painting the

surface(s) flat-black, scuffing any shiny surface, or

drilling a large hole, directly opposite the diffuse sensor

•

Move the sensor closer to the object to be detected and

reduce the Gain adjustment. Rule of thumb for diffuse

sensing: The distance to the nearest background object

should be at least three times the sensing distance

Note:

•

Light condition: sensor output is ON

when there is no object in the beam

•

Dark condition: sensor output is ON

when there is an object in the beam

Retroreflective Mode Alignment

Retro

Target

A highly reflective object may reflect enough light back to a

retroreflective sensor to allow that object to slip through the

beam, without being detected. This problem is called proxing,

and the following methods may be used to correct it:

•

Position the sensor and retro target so the beam will not

strike a shiny surface perpendicular to the sensor lens

•

Reduce the Gain adjustment

•

Add a polarizing filter (for model SM312LV)

Note:

•

Light condition: sensor output is ON

when there is no object in the beam

•

Dark condition: sensor output is ON

when there is an object in the beam

Convergent Mode Alignment

Object

Low

Reflectivity

Background

The sensing energy of a convergent mode sensor is

concentrated at the specified focus point. Convergent mode

sensors are less sensitive to background reflections, compared

with diffuse mode sensors. However, if background reflections

are a problem:

•

Skew the sensor position at a 10° to 25° angle to

eliminate direct reflections from shiny background

surfaces

•

Reduce the reflectivity of the background by painting the

surface(s) flat-black, scuffing any shiny surface, or

drilling a large hole, directly opposite the sensor

•

Reduce the Gain adjustment

Note:

•

Light condition: sensor output is ON

when there is no object in the beam

•

Dark condition: sensor output is ON

when there is an object in the beam

MINI-BEAM® DC Voltage Series Sensor

www.bannerengineering.com - Tel: + 1 888 373 6767

P/N 69943 Rev. G

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