Perceptive color processing with Profinet connectivity

The color sensor processes colors in a perceptual way

The CROMLAVIEW® CR210PN color sensor processes colors in a perceptual way (i.e. according to human perception) and assesses color distances with the precision of the human eye. For this purpose, a Lab color space is used in the color sensor, which has been equipped with a 4 Watt high power white light LED. Color distances are measured and assessed the same way humans would do. This sensor offers a maximum of flexibility, as it can be combined with a large number of optical fibers and focus optics by means of an optical fiber connection. On the other hand, multiple interfaces leave nothing to be desired. The color sensor, for example, can be connected with the computer via RS232 or USB interfaces. The freeware software CR-Tool, supplied with all CROMLAVIEW® color sensors, facilitates the parameterization and the visualization of color values. Besides that, the color sensor can also be operated using the buttons. More standard interfaces are 12 push-pull switching lines (24 V/100 mA per line), which, when binary encoded, can output 4096 switching states. For easy integration in industrial automation, the CR210PN has been equipped with a Profinet interface. This interface is frequently used for the control of sensors and actuators in production engineering. The control itself is performed by a central control (SPS), which often plays an important role in standard diagnostic options. As all the other CROMLAVIEW® color sensors, the CR210PN is also equipped with the CROMLASTAB® technology, which protects it from temperature and age drift and thus ensures secure and reliable operation in the whole life cycle.


The functional principle of the CR210PN is based on the three range procedure. The measuring light is assessed with the tristimulus value functions and assigned to the three wave length ranges red, green and blue. Through the assessment with these tristimulus value functions the sensor is able to perceive colors similar to the human eye.
The sensor contains an own white light source clocked with a frequency of up to 10 kHz. Sampling takes place in both, the light and the dark phase. Additive ambient light cannot change the difference between the light and dark phase, so that the sensor is independent from ambient light.


  • Up to 100 colors can be stored
  • Quick response time from 50 µs
  • 12 channels, with binary encoding 4096 output combinations
  • Long-term stability of color recognition without new teach-in by CROMLASTAB®-technology
  • Finest color differences can be detected (ΔE < 1)
  • Standard interfaces: USB, RS232, 12 push-pull outputs (24V/100mA)
  • Field bus interface: Profinet IO
  • PC software CR-Tool for parameterization and visualization of color values

Technical data

Sensing channels

  • 1 sensing channel
  • 1 internal stabilization channel

Drift stabilization

CROMLASTAB® can be switched off

Receiving detector

Three range photo diode

Sensitivity steps

8 (1x, 4x, 20x, 40x, 80x, 200x, 400x, 800x)

Receiving signal resolution

3 x 4096 steps

Object illumination

  • Power white light LED
  • Adjustable (4096 steps)
  • Can be switched off

Response time

≥ 50 µs


  • 12 Switching outputs
  • 2 Control inputs
  • RS232
  • USB
  • Profinet IO


20 LEDs for outputs and status


3 Buttons for teach -in

Color resolution

ΔELab < 1


0 ms ... 65535 ms

Color output channels

12 (up to 100 with binary encoding)

Protection standard

IP 54

Power supply

18 ... 28 VDC, max. 500 mA

Case temperature during operation

-10 °C ... 55 °C

Coupling in signal path

Via optical fiber

Case size

100 mm x 70 mm x 30 mm


295 g


Dr. Gundolf Geske

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