The standard borehole piezometer is suitable for most applications. It can be directly grouted-in using a bentonite-cement grout. This greatly simplifies installation of multiple piezometers in the borehole and also allows the piezometer to be installed with inclinometer casing. The VW standard borehole piezometer converts water pressure to a frequency signal via a diaphragm, a tensioned steel wire, and an electromagnetic coil. The piezometer is designed so that a change in pressure on the diaphragm causes a change in the tension of the wire. When excited by the electromagnetic coil, the wire vibrates at its natural frequency. The vibration of the wire in the proximity of the coil generates a frequency signal that is transmitted to the readout device. The readout device processes the signal, applies calibration factors, and displays a reading in the required engineering unit. Custom cable lengths are available for all sensor ranges. Cable pricing will be provided on the formal quotation.
