The pneumatic piezometer is mechanically simple, inexpensive, reliable and robust. It avoids many of the problems associated with electrical instrumentation.
The Pneumatic Piezometer is designed for accurately measuring pore water pressures in fully or partially saturated soil and rock.
The Pneumatic Piezometer tip comprises an integral porous element with a high quality diaphragm transducer, installed either down a borehole, by burying in fill or by pushing into shallow depths in soft soil.
Twin nylon tubes in a polythene sheath can connect the transducer to a terminal panel or to the portable readout unit directly.
- Low volume change
- Can be installed in horizontal and upholes
- Pneumatic tubing is strong and flexible and can be installed in lengths of up to 500m
- All piezometer components corrosion-proof
- Small, accurate and reliable design
- Fast response
- Ideal for underground works
- Suitable for flow or no-flow operation
- Level of tubing in relation to readout is not critical
The piezometer is buried in fill, suspended in a borehole or pushed into soil.
Twin tubes connect the transducer within the piezometer tip to either a pneumatic terminal panel or a readout unit. When pore water pressure is exerted on the diaphragm, reverse pressure is applied until pressure equilibrium is reached, then the readout unit displays the reading.
The readout displays engineering-based units. Readings can be taken up to 500m from the tip.
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 placement of fill.
Typical applications include:
- For environmental management including landfill sites
- Monitoring of aquifers
- Monitor tidal effects on coastal soils
- Potential landslide sites
- Dewatering excavations
- Tailings lagoons
- Pumping tests
- Monitor seepage
- Control placement of fill