FineTek SD Series Optical Level Switch

Part Number: SDX Categories: ,

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Fintek SD series is an optical level switch line that emits a beam of infrared light into the tip (prism) of the sensor. In the absence of the liquid at the sensor tip, the light is reflected back to the sensor’s receiver. When the target liquid is present surrounding the sensor tip, the light is refracted into the liquid and away from the SD series level switch receiving component thus how liquid presence and absence is determined. The SD series output will be activated accordingly. These optical level switch devices are compact, cost-effective and ideal for a wide variety of fluids.


  • Pump Dry Run Protection
  • High and low-level detection in air conditioning chiller systems
  • Maintain reservoir level in hydraulic systems
  • Automotive systems


  • HVAC
  • Pharmaceutical
  • Process industries
  • Automotive
  • Others
  • Simple and compact with no moving parts
  • LED indication
  • 10-28VDC, 115VAC or 230VAC powered versions
  • Solidstate NPN/PNP or relay output
  • Operating temperatures up to 257⁰F (125⁰C)
  • Wide range of use in machine systems for a variety of liquid level detection
  • Unique SD22 design, switch body and tip disconnects

Catalog: Finetek SDX Optical Level Switch catalog

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