Dairy processing plant uses safety light curtains with IP69K protective enclosure

A Case Story from Schmersal

A dairy processing plant required safety light curtains with IP69k to withstand high pressure (to 1450 PSI) and high temperature (to 176° F / 80° C) wash downs in the food processing environment.  They previously used alternative safety light curtains which were prone to failing under washdowns.  Additionally, aligning those curtains was another challenge they faced. The solution for their application was  light curtains with IP69K protective enclosure from Schmersal.

Schmersal SLC440 light curtainSchmersal’s Solution

SLC440 safety light curtains SH

  • Protective enclosure SH – stainless steel
  • Protective enclosure PH – polyamide

Options are available for the SLC440 light curtains to be factory sealed within an IEC 60529 IP69 rated enclosure. This allows the curtains to be used in areas where they may be exposed to high pressure or high temperature wash downs or ECOLAB approved cleaning agents.


  • High protection class IP69, 2-part O-ring seal
  • Hygienic design – End caps, mounting and membrane made of stainless steel V4A
  • Break and shock-resistant protective tube made of polycarbonate
  • Connection with M12x1 4-pin or 8-pin, cable length 10 m
  • Beam blanking device for fixed and moving objects
  • User-friendly parameter setting, no tools required
  • Process reliability with daily cleaning
  • Integrated set-up tool
  • Optional integrated AS-i Safety at Work interface
  • Resolution 14 mm … 30 mm
  • Range 0.3 m … 20 m
  • Area protection with up to 4 emitters
  • Suitable for applications in PL e / SIL 3


  • Power-driven machines
  • Power presses
  • Folding or brake presses
  • Filter presses
  • Punching machines
  • Robot cells
  • Welding booths
  • Printing machines
  • Injection molding
  • Materials handling and storage technology
  • Palletizers
  • Packaging equipment

Tri-Phase Automation is a Schmersal Distributor in Wisconsin. We can answer your questions or provide you with a quote.