PTFE Coated Miniature Photoelectric Sensors

Bulletin 42KF PTFE Coated Miniature Photoelectric Sensors are designed for liquid level detection applications typically found in the semiconductor wafer manufacturing and handling industry. The PTFE (polytetrafluoroethylene) casing protects both the sensor and the connecting cable from many caustic solutions which would normally damage other sensors. These sensors are DC operated and provide a sinking (NPN) output. You can connect an optional output module in-line with the sensors to convert this signal to a sourcing PNP output.

Popular Resources/Quicklinks
Presence Sensing Brochure PHOTOSWITCH Bulletin 42KF Installation Instructions


  • PTFE casing for protection in caustic environments
  • Diffuse and transmitted beam sensing modes
  • Complements Rockwell Automation® PTFE coated fiber optic cables
  • External sensitivity adjustment
  • Fast 350 µs response time
  • 3 m cable connection

Product Selection


  • CE Marked for all applicable directives
  • CSA Certified
  • UL Listed
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Resource Publication Number Language
Presence Sensing Brochure SENSOR-BR001
PHOTOSWITCH Bulletin 42KF Installation Instructions 42KF-IN001
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