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Designed and tuned to meet stringent USGS OSW specifications 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  

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 Characteristics

  • Supply Voltage (V) 6 – 28

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

Body Features

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


  • Pressure Range  0 – 4 to 22 psi

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

  • Accuracy  ± .01ft Water

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

  • Overpressure  2X FS


  • Options  Lightning Protection

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