Hermetically sealed sensor for measuring pore water pressure in soil, rock, and concrete foundations.
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Hermetically sealed sensor for measuring pore water pressure in soil, rock, and concrete foundations.
The Geolook Vibrating Wire Piezometer is the industry standard for monitoring pore water pressure in geotechnical applications. It allows engineers to determine the safety factor of embankments, predict slope stability, and verify dewatering systems. The instrument consists of a sensitive stainless steel diaphragm and a magnetic wire enclosed in a rugged, hermetically sealed housing. As water pressure acts on the diaphragm, it deflects, changing the tension of the wire. This change is transmitted as a frequency signal, providing accurate, long-term data unaffected by cable resistance or moisture intrusion.
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Groundwater pressure enters the sensor through a porous filter tip and presses against a steel diaphragm. A high-tensile steel wire is stretched between this diaphragm and a fixed point inside the body.
An electromagnetic coil plucks the wire, making it vibrate. When water pressure increases, the diaphragm deflects inward, reducing the tension in the wire and lowering its vibration frequency. The readout unit measures this frequency and converts it into pressure units (kPa, psi, or meters of water head).
Choosing the right filter is critical:
Historically, piezometers required a complex 'sand pocket' installation (surrounding the sensor with sand and sealing above it with bentonite pellets). This was slow and prone to error.
The Geolook G75-V850 is designed for the modern 'Fully Grouted' method. The sensor can be lowered into the borehole, and the entire hole is filled with a specialized cement-bentonite grout. This method is faster, cheaper, and often provides more accurate data by eliminating vertical water flow within the borehole.
Groundwater pressure enters the sensor through a porous filter tip and presses against a steel diaphragm. A high-tensile steel wire is stretched between this diaphragm and a fixed point inside the body.
An electromagnetic coil plucks the wire, making it vibrate. When water pressure increases, the diaphragm deflects inward, reducing the tension in the wire and lowering its vibration frequency. The readout unit measures this frequency and converts it into pressure units (kPa, psi, or meters of water head).
Historically, piezometers required a complex 'sand pocket' installation (surrounding the sensor with sand and sealing above it with bentonite pellets). This was slow and prone to error.
The Geolook G75-V850 is designed for the modern 'Fully Grouted' method. The sensor can be lowered into the borehole, and the entire hole is filled with a specialized cement-bentonite grout. This method is faster, cheaper, and often provides more accurate data by eliminating vertical water flow within the borehole.
Choosing the right filter is critical:
We are currently updating the specific model configurations and technical datasheets for this product category.