Delta CS64A - Manual (Page 9)

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inside dimensions of the rectangular could be a small as 3/4” by 4”, although 1” x 4 ½”
would be preferable. Flat black surfaces are especially important with these smaller
inside dimensions.
2.2.2 Fixed applications where it is necessary to accommodate variations
in sensor-to-target distances
In some applications, the standoff distance will vary, if not during the normal sensing
time, then during loading or unloading of the objects. In these applications the tube must
be of a very flexible material. A brush can be used, as can deep weather-stripping or a
bellows for maximum accommodation.
As with rigid tubes, it is preferable that the bellows be as large as practical (ID: 4” x 6”)
to minimize internal reflections. The inside of the bellows should be optically flat black.
It is not always practical to paint flexible devices, so it is important to ensure that the
material itself is black. Flat or matte finishes are preferable over gloss finishes,
especially in bellows with small inside dimensions.
If space allows, flexible polyurethane bellows are available from McMaster-Carr with
inside dimensions of 6 5/8” square or 4” square. (Outside dimensions are 8 5/8” and 6”,
respectively). McMaster-Carr also carries a wide variety of brushes and vinyl weather-
stripping, door gaskets, and rubber wear strips.
Color Sensor
Light
Block
Tube
Optional seal or
weather-stripping
Inside of tube
to be flat black
Target
Object
Side View: CS64A with Light Block Tube
CS64A-00
Color Sensor
Light Blocking Tube
– 4” x 6” inside
Top View: CS64A with Light Block Tube
Color Sensor
Bellows
Inside of bellows
to be flat black
Target
Object
Side View: CS64A with Bellows