Soil Instruments Vibrating Wire W9

The Vibrating Wire Piezometer is designed for accurate and long term measurement of pore water pressures in fully or partially saturated soil and rock.The transducer is made from high quality 316 grade stainless steel and designed to handle pressure ranges from -50 to 4000 kPa. It incorporates an over voltage surge arrestor that offers protection from a lightning strikeThe piezometer may be fitted with either a low air entry sintered steel or high air entry ceramic filters. A coned nose piece is available for push in installations. An integral thermistor for temperature monitoring is included.

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  • Small diameter
  • Uses proven Vibrating Wire (VW) technology
  • Manufactured from high grade 316 stainless steel for extended operation
  • In-built temperature compensation
  • Hermetically sealed
  • Suitable for long-term monitoring
  • No electronic components in sensor module
  • Capable of measuring negative pore pressures to –50 kPa
  • Fitted with thermistors for temperature monitoring


  • Over 30 years of expertise in the design and manufacture of Vibrating Wire instrument technology
  • Accurate, repeatable readings over long cable lengths
  • Long working life, long term stability and reliability
  • Fast response to pressure changes
  • Design prevents case stresses from affecting readings
  • Over-voltage surge arrestor protects against electrical damage
  • Connecting cable is strong, screened and flexible


Related products

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Soil Instruments 4-20MA Piezometer

Designed for accurately measuring pore water pressures in fully or partially saturated soil and rock.

Soil Instruments Heavy Duty Vibrating Wire

Designed for long term monitoring and accurate measurement of pore water pressures.

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