Delta CS24D - Manual (Page 28)

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9.6 General Information
The term "color" actually implies visible light--wavelengths from about 400nm (violet) to
about 750nm (deep red), although in this document any wavelength that can be seen by
the CS24D is referred to as a color.
With high intensity blue LEDs (450nm) and several visible wavelengths up to 700nm
available, Delta’s sensors can be made to see practically the entire visible color spectrum.
But the capability does not stop there; the precision photodiode in the sensors can see into
the near infrared up to about 1,000nm, and LEDs are readily available in this region as
well.
The near-infrared (NIR) spectrum can be valuable in special applications. For example,
the ratio of two different NIR colors can be used to detect certain types of glue, while
ignoring visible color variations. Contact Delta for more information on these
applications.
10. Maintenance
Cleaning: Under normal conditions, the CS24D requires little or no maintenance other
than keeping the window and sensing area clean. Use only water and cleaning materials
compatible with polycarbonate, such as isopropyl alcohol.
In dusty conditions, an automated air nozzle can be used to help keep the window clean.
The ratio calculations will compensate for signal strength degradation down to about 75%
of normal signal. Beyond that, performance will start to suffer. Once the window and
viewing area are cleaned, the ratio calculations will automatically readjust to the clean
conditions.
Of course, if the signal amplitude is used directly (Intensity Weighting Factor greater
than 0), then dust on the window (or any other condition causing a reduction in signal
strength) will directly affect performance. The severity of this effect depends on the
application.
If the window becomes scratched or damaged, it should be replaced. Order from Delta:
Part No: CS24-Window.