AutomationDirect now offers Datalogic print mark contrast sensors with 6-12mm sensing distances. Designed to detect the difference in the wavelength of the reflected light between a target mark and background, the contrast sensors use RGB light emission with automatic selection, and feature teach-in sensitivity adjustment, and selectable light on/dark on outputs.
The S8 Series compact contrast sensors feature horizontal spot orientation, a 25 kHz switching frequency, NPN or PNP logic output, 12-30 VDC operating voltage, and are available with IP67-rated plastic or IP69K-rated 316L stainless steel housings. The S8-series sensors, are fitted with a 4-pin M8 quick-disconnect or have an attached 150mm cable with M12 quick-disconnect.
New TL Series contrast sensors feature vertical or horizontal spot orientation, 10-30 VDC operating voltages, aluminum housings, and NPN/PNP or PNP logic outputs. TL-series sensors are fitted with a 5-pin M12 quick-disconnect with adjustable exit angle models are available with 0-5VDC analog outputs and 15, 20, or 50 kHz switching frequencies. The TL series are IP67-rated contrast sensors.
In this HOW TO video, I will give a brief overview of contrast sensors and how to setup one of the Datalogic contrast sensors that we sell here at AutomationDirect. Contrast sensors provide a method of detecting a difference in contrast between presence and absence of an object or mark. They are different from a standard diffuse photoelectric sensor where they use a highly sensitive lens positioned at a specific focal distance away from a detection target. Contrast sensors have a fast response time and can detect marks that pass by the sensor at intense speeds. These Datalogic sensors have an alternating Red, Green and Blue emissions in order to achieve the desired color mark acquisition or target. As you can see in this quick demonstration, I use a Stainless Steel bodied NPN sensor part number: S8-MR-5-W13-NN and wire it to the input of a CLICK PLC. I set the target to ONLY detect the Blue Color on this color wheel and I set the background as green. To set the target, first I press the set push button until all led lights are off. Then I rotate the color to green or mark and I press the set button again to set the background. The green LED will blink and when ready the green LED stays illuminated. Once the target and background are set, I can rotate the color wheel and demonstrate the sensor will detect the target. This is true for any color that is set as a target and a background. I now reverse the colors and set the previous target as a background and the previous background as a target. All of the new Datalogic contrast sensors have a potentiometer for light and dark mode setting. Rotate the adjustment counter clockwise to set LIGHT mode or clear mark on dark background or rotate the adjustment clockwise for DARK mode or dark mark on a clear background. Simple enough to setup. I hope you found this video useful and follow us to our other How to videos on the Datalogic Contrast Sensors. Thanks and have a great day.