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Help CenterVibrating/Steel Wire Piezometer
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Working principle
The VW Piezometer operates on the principle that a tensioned wire, when plucked, vibrates at its resonant frequency. Around the wire is a magnetic coil which when pulsed by a vibrating readout or data logger interface plucks the wire and measures the resultant resonant frequency of vibration. A change in distance between the anchor and the diaphragm is related to pressure differentials and can be converted to a kPa reading.
Temperature information can be used if logging regularly to determine swift temperature changes during which pressure readings may be exaggerated
Features
Reliable long-term performance
Rugged, suitable for demanding environments
High accuracy
Insensitive to long cable lengths
All non-drive-in models can have threaded adaptors to customer specifications
Applications
Pore pressure measurement in soils and rocks
Fluid pressures in hydro-fracture and pump tests
Structure
Permeable ring +sensitive membrane+seal case+signal wire+vibration wire+strong vibration eletromagnetic
Caculate
When pore piezometer loads pressure of water, the voltage "P" and output frequency "F" as below :
P = k（F20-F2i）
K — Pressure Sensitivity
Fi — Measurement
F0— Reference Value
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