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Designed and tuned to meet stringent USGS OSW speci-fications of ±0.01 Ft. H2O often required by governmental regulatory agencies and research institutions.  The KPSI 501 incorporates a highly stable media-isolated sensor, and features SDI-12 and RS-485 serial-digital interface standards. SDI-12 is a commonly used standard for interfacing data recorders with microprocessor-based sensors, in the environmental monitoring field. The KPSI 501 is an excellent solution for applications that require minimal current drain. It will accommodate cable lengths between sensors and recorder up to 1000 feet.  


  • SDI-12 Submersible Level Transducer
  • ±0.01 ft. H2O, reading <= 10ft (3m) H2O
  • ±0.10% reading, reading > 10ft (3m) H2O
  • Accuracy for 0-15 psi and 0-22 psi ranges meets USGS OSW requirements
  • Optional Lifetime Lightning Protection
  • Two Year Warranty


  • Groundwater Monitoring
  • Down Hole
  • Surface Water Monitoring
  • Tailrace and Forebay Monitoring
  • Oceanographic Research  
  1. Configuring KPSI Liquid Level Transducer Part Numbers (English)

Learn how to configure a part number for KPSI analog and digital liquid level transducers including: 300, 500, 600, and 700 Series.


Please review product documents or contact us for the latest agency approval information.  

Product Type Features

  • Sensor Type  Digital Water Level Sensors

  • Type  Gage

Configuration Features

  • Pressure Port/Fitting  1/2 MNPT, 1/4 M BSP, 1/4 MNPT, M14 x 1.5-60, Open Face, Piezometer, Ported

  • Electrical Connection  1/2 MNPT Gland, 1/2 MNPT Overmold, Gland Cable Seal, Overmold Cable Seal, Removable Cable Option

Electrical Characteristics

  • Supply Voltage (V) 6 – 28

Body Features

  • Port Material  316 SS, FKM, Polyoxymethylene, Polyurethane, Titanium

Usage Conditions

  • Operating Temperature Range  -20 – 60 °C [ -4 – 140 °F ]


  • Pressure Range  0 – 4 to 22 psi

  • Accuracy  ± .01ft Water

  • Output/Span  RS-485 with SDI-12 Protocol, SDI-12

  • Overpressure  2X FS


  • Options  Lightning Protection

Related Materials

Datasheets & Catalog Pages

Product Specifications

Manuals & User Guides

Agency Approvals

Agency Approval Document

Terms and Conditions

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This information has been provided to your free of charge for your use but remains the sole property of TE Connectivity Corporation (''TE'') or SnapEDA,  Inc. or Ultra Librarian/EMA Design Automation, Inc. (collectively, "Company"). While Company has used reasonable efforts to ensure its accuracy, Company does not guarantee that it is error-free, not makes any other representation, warranty, or guarantee that the information is completely accurate or up-to-date. In many cases, the CAD data has been simplified to remove proprietary detail while maintaining critical interface geometric detail for use by customers. Company expressly disclaims all implied warranties regarding this information, including but not limited to any implied warranties or merchantability or fitness for a particular purpose.