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LS-REGSENSOR Registration Mark Sensor

registration mark sensor
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The LS-REGSENSOR is a registration mark sensor designed to see printed registration marks on most packaging materials on a continuous web. The “one-touch” set-up enables the sensor to be adjusted with a single push of a button. There is no more guess work, making the operator’s adjustment procedure easy!

The LS-REGSENSOR utilizes a white LED light source that is optimized to detect printed registration marks on translucent, transparent, and many metalized films and paper. This sensor is particularly useful on form, fill, and seal machines. Note that most packaging materials (except foil) are translucent! Many of the translucent packaging materials that we have tested allow light to penetrate either the backing material or the registration mark. Because this sensor operates in the opacity sensing mode, the color of the registration mark simply doesn’t matter! Note: Marks as small as 1/16” wide by 1/4” long can be detected, dependent upon web opacity (contrast) and velocity.

The LS-REGSENSOR operates on 10 to 30 VDC and is pulse modulated to prevent any problems with ambient light. Its design incorporates a white LED light source directing a beam of light across the gap to the receiving lens of a photoelectric detector. In operation, the moving web of packaging material passes through the gap/slot. This sensor can detect registration marks in a wide variety of applications, as long as the size of the mark and velocity meets the capability of the sensor. When the intensity of the light beam transmitted through the web of material is altered by the presence of printed registration mark, the LS-REGSENSOR will switch its output accordingly. Note: For “Metalized” film that does not produce the desired response, we recommend sensing with a reflective mode sensor.


  • Includes remote Autoset™ and Selectable Pulse Stretcher
  • Single, one pushbutton set-up
  • Color Mark registration detection on transparent and translucent, including many metalized films and paper

Set Up

The LS-REGSENSOR is an automatic sensor...it is not a conventional “teach mode” sensor. As a result, all that is required to adjust the sensor is to place the web between the marks and push the appropriate Autoset™ button one time. The sensor will automatically adjust itself to a perfect setting. The LS-REGSENSOR will now sense the difference or contrast between the light level penetrating through the web, giving an output when the mark is in view. Provision for a remote Autoset™ switch is also provided.


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Supply Voltage10 to 30 VDC Polarity Protected
Current Requirements45 milliamps
Remote Autoset Input Opto isolated momentary sinking input 10 milliamps
Output Transistors(1) NPN and (1) PNP sensor output transistors
Outputs sink or source up to 150 milliamps (current limit)
All outputs are continuously short circuit protected
Response TimeLight state response = 100 microseconds
Dark state response = 100 microseconds
Ambient Temperature-40 °F to 158 °F (-40 °C to 70 °C)
HysteresisMinimal Hysteresis promotes the detection between the backing material and the label depending on the settings
Selectable Pulse StretcherProvides a minimum of 10 milliseconds output duration


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Sensor for Triggering Stroboscopes On Registration Marks
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