New Multi-level Piezometer released
The multi-level vibrating wire piezometer is perfect for measuring pore pressures at various depths beneath a single surface location. It allows for quick and reliable installations because multiple piezometers are connected to a single communication cable, which is in turn connected to the data acquisition system or readout. This configuration eliminates complicated and time consuming and, therefore, costly process for installing multiple single sensors in the same borehole. This simplified installation not only reduces installation time but also minimizes the potential for hydraulic communication between sensors that might lead to erratic readings. A typical installation of the multi-level piezometer utilizes a direct grouting installation so that only the multi-level piezometer string and a grout injection tube are needed to complete the installation. Once the grout has hardened, the piezometers are isolated from one another, allowing precise measurements of pore water pressure changes at various depths.
The multi-level piezometers incorporate the same standard features included in our single PW-series vibrating wire piezometers. The main function of this multi-level piezometer is to measure pore water pressure beneath the ground surface. It provides significant advantages in terms of time, resources and cost reduction related to installation, while providing quick and reliable reading at various depths. The multi-level piezometer allows the customer to define sensor spacing along the readout cable providing precise depth control based on site specific requirements. Junctions between each piezometer and the main cable are reinforced using epoxy resin for a waterproof and durable seal. The time proven design of the PW-series sensors allows them to be tied to the multi-level piezometer core cable and provide very reliable long-term performance. The sensor wire is fabricated using proven methods for ensuring an exceptional long-term stability. It is isolated in a vacuum sealed chamber to protect against corrosion. A gas filled spark gap integrated into each sensor protects against electromagnetic surges and radio frequency interference. A triple watertight barrier is installed at the cable end to prevent water infiltration to the sensor core. To this day, thousands of PW sensors have been installed and operate throughout the world.