4-20mA Piezometer

The 4-20mA Piezometer is designed for accurately measuring pore water pressures in fully or partially saturated soil and rock. The transducer is fitted with a sintered Stainless Steel filter disc and is available as a vented (gauge) piezometer or a non-vented (absolute) piezometer.

The Piezometer is built from high-quality 316-grade Stainless Steel and is fitted with a thermistor for temperature monitoring.

The 4-20mA Piezometer is devised for pressure ranges from -50 to 3500 kPa.


Product Features 

  • Accurate with excellent long term stability
  • Fitted with thermistor for temperature monitoring
  • Fast response to pressure changes
  • Advanced design prevents case stresses from affecting readings
  • Capable of measuring negative pore pressures to -50 kPa (absolute non-vented unit)

Product Benefits

  • Manufactured from high grade 316 Stainless Steel for extended operation
  • Small diameter device
  • Hermetically sealed, ensures long working life of the instrument
  • Connecting cable is strong, screened and flexible


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The 4-20mA Piezometer is designed for the accurate measurement of pore water pressures in fully or partially saturated soil and rock.

The Piezometer is buried in fill, suspended in a borehole, or pushed into soil.

The Piezometer tip comprises a porous filter element integral with a diaphragm-type pressure transducer. A cable connects the transducer to a readout, terminal unit, or datalogger.


Piezometers are used in geotechnical, environmental, and hydrological applications. They can be installed in boreholes and placed in fill materials or open wells to measure water levels or pore water pressures to enable engineers to verify design assumptions and control the placement of fill.

Typical applications include:
  • For environmental management including landfill sites
  • Monitoring of aquifers
  • Monitor tidal effects on coastal soils
  • Dams
  • Embankments
  • Potential landslide sites
  • Dewatering excavations
  • Tailings lagoons
  • Pumping tests
  • Monitor seepage
  • Control placement of fill

If you have any questions or would like more information, please contact us.