Delta CS24D - Manual (Page 30)

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is needed and for maximum consistency, bright ambient light (such as sunlight) should be
blocked from the sensing area.
Q. What are the power requirements for the CS24D?
A. The CS24D is rated for 12-24Vdc ±20% and 50mA maximum. Typical current draw
is about 30mA. The power supply must be able to provide a startup surge current of
about 250mA. Although the power supply is not critical, for best noise performance a
dedicated, linear supply is recommended. The power input is fully isolated.
Q. Does the CS24D require any other inputs?
A. No, except for setup and Teaching. The CS24D "free-runs" and outputs are updated
periodically. An optional Hold input “freezes” the outputs allowing a simple method of
ensuring data consistency. Alternately, data consistency can be ensured by taking
multiple readings.
Q. Can I use the CS24D in a wash down environment?
A. The standard enclosure for the CS24D is dust-tight. Contact Delta for availability on
a special sealing package for operation in wet environments.
Q. Does the CS24D 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 CS24D on your samples and recommendations for your application.
(No charge on new applications). Demo units are also available to qualified customers.
Delta’s ColorSense software shows the performance as worst case standard deviation for
your target colors.
Q. How sensitive is the CS24D 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 CS24D. See Section 9.4.
Q. How about curved surfaces?
A. Again, this is more critical on glossy surfaces and, if possible, the curve should be
oriented with the narrow axis (small dimension) of the CS24D. Concave, glossy surfaces
should be avoided if possible as they can cause direct reflections. See Section 9.3.
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
1602 Ultra-flat black. Some materials and finishes may provide acceptable performance
without painting. They may not be obvious, however black anodized aluminum reflects
in the near-infrared spectrum, for example, and should not be used without painting.
Q. What is the minimum size that I can make the slot that the CS24D looks through?
A. If space is tight, you can reduce the slot to about 5/8 x 2 inches providing the sensor is
centered well. A better solution might be to angle the sides of the hole so the dimension