Delta CS64A - Manual (Page 17)

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A. In PLC sorting applications, the host system typically reads the four 0-10V signals
and sets thresholds on the Red/NIR, Blue/NIR, Green/NIR ratios and NIR amplitude
readings as needed. (Usually not all four are required in a given application). Using
ratios compensates for most variations caused by sensor-to-target distance changes and
dust on the sensor window.
Q. Does the CS64A require special lighting?
A. No additional lighting is required. The CS64A is completely self-contained with its
own lighting system using high intensity light-emitting diodes (LEDs). No external light
is needed and for maximum consistency, ambient light should be blocked from the
sensing area.
Q. What are the power requirements for the CS64A?
A. The CS64A is rated for 24Vdc ±5% and 100mA maximum. Typical current draw is
about 40mA. Although the power supply is not critical, for best noise performance a
dedicated, linear supply is recommended. A dedicated supply also allows the circuit
common and case ground to be connected inside the sensor, which often results in lowest
electrical noise.
Q. Does the CS64A require any other inputs?
A. No. The CS64A "free-runs" and outputs are updated at a 1ms rate. Filtering
minimizes glitches, so it is not necessary to synchronize the A-D to the sensor.
Q. Can I use the CS64A in a washdown environment?
A. The standard enclosure for the CS64A is dust-tight. For wet environments, any
model of the CS64A can be ordered with a special package that allows it to be mounted
into a sealed enclosure of your choice (specify –OEM at the end of the part number). An
optional window kit is available as well.
Q. Does the CS64A have a color sensitivity specification (e.g. delta E (with CIELAB or
CIEXYZ coordinates) that is common with spectrophotometers)?
A. Since on-line applications vary so widely, this specification would be of limited
value. Instead, Delta will test your samples for you and send a report showing the
performance of the CS64A on your samples and recommendations for your application.
(No charge on new applications). Demo units are also available to qualified customers.
Q. How sensitive is the CS64A to changes in angle of the object?
A. The sensitivity to angles varies from very insensitive on matte surfaces to quite
sensitive on gloss surfaces. This effect can be minimized with proper orientation of the
sensor to the object. If possible, the varying angle should be oriented with the small
dimension of the CS64A.
Q. How about curved surfaces?
A. Again, this is more critical on glossy surfaces and, if possible, the curve should be
oriented with the small dimension of the CS64A. Concave, glossy surfaces should be
avoided if possible as they can cause direct reflections.
Q. I would like to have the sensor “look” through a slot. What materials/paints would be
good to look through?
A. Ideally, the inside surface of the slot should be optically flat black. In most cases, this
can be easily achieved by painting with a high quality, flat black paint such as Krylon