Multi-Point Vibrating Wire Piezometer String
The RST Instruments VW2100MP combines two to six vibrating wire piezometers on a single cable to measure pore water pressure and temperature at several depths in one borehole. The assembly is designed for fully grouted installation.
- Description
- Characteristics
- Solutions
- Model information
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String Construction and Borehole Installation
The piezometers are positioned at specified depths along the cable. The string is lowered into the borehole with a grout pipe, and the borehole is filled with cement-bentonite grout. This arrangement allows pore water pressure to be monitored at multiple depths.
The water-blocked cable has a polyurethane jacket and Kevlar® reinforcement, with dedicated conductors for each sensor. Each piezometer has a sealed stainless steel housing and a built-in thermistor. The vibrating wire signal is resistant to electrical interference and can be captured using a compatible readout or data logger.
Sensor count, installation depths, cable length, and pressure ranges are selected to suit the project.
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Technical specifications
- Overrange 1.5 × full scale
- Pressure resolution 0.025% of full scale (min.)
- Pressure accuracy 0.1% of full scale
- Operating temperature −20 to +80 °C
- Diaphragm displacement Less than 0.001 cm³ at full scale
- Thermal zero shift Less than 0.05% of full scale per °C
- Housing Hermetically sealed stainless steel
- Thermistor type NTC, 3 kΩ at 25 °C
- Thermistor interchangeability ±0.2 °C, optional ±0.1 °C
- Thermistor resolution 0.1 °C
- Filter 50 µm sintered filter
- Cable for 2–3 piezometers EL380012, 12 conductors
- Cable for 4–6 piezometers EL380013P, 13 conductor pairs
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Applications
- Pore water pressure monitoring in earthfill dams and embankments;
- Pore water pressure measurement for slope stability assessments;
- Pressure monitoring behind retaining walls and diaphragm walls;
- Pore water pressure monitoring at land reclamation sites;
- Pore water pressure monitoring during fill placement and excavation.
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Technical specifications
Model Description Range Dimensions VW2100MP-XXXX String of 2–6 vibrating wire piezometers on one cable. Configured to suit the project. 0.35 / 0.7 / 1.0 / 2.0 / 3.0 / 5.0 / 7.5 / 10.0 MPa Depend on cable selection and pressure range
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