They use the well-proven vibrating wire technology of converting fluid pressures onto a pressure sensitive diaphragm which when deflected causes a change in tension and the corresponding change of frequency of the wire. In addition, an internal high temperature thermistor allows the temperature at the piezometer location to be measured.
Manufactured from high temperature and corrosion-resistant materials throughout, together with a comprehensive temperature calibration, they provide high accuracy stable long-term data with no zero shift.
The specially-designed Tubular Encapsulated Cable (TEC) is both high temperature resistant and highly flexible for easy installation within boreholes or above ground.
Also available as a pressure transducer with a threaded connection in the base.