- Level Measurement & Monitoring
- Water Quality Meters
- Dataloggers & Sensors
- Monitoring Wells, Piezometers & Multilevels
- Sampling Devices & Pumps
- Microbial Sampling & Bioremediation
- Modelling Software
- Groundwater Mapping
The VW 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 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.
VW piezometers provide a resolution of 0.025% of full scale.
Slope Indicator’s automated, precision calibration system ensures that all VW piezometers meet or exceed their accuracy specifications.
The VW piezometer can be directly grouted-in with a bentonite-cement grout. More information about the direct grout-in method can be found in the VW piezometer manual and in a technical note.
VW piezometers offer rapid response to changes in pore water pressure, whether they are grouted in, pushed into cohesive soils, or embedded in a sand filter zone.
Reliable Signal Transmission
With properly shielded cable, signals from the VW piezometer can be transmitted long distances.
All VW piezometers are equipped with a temperature sensor.
|Sensor Type||Pluck-type vibrating wire sensor with built-in thermistor|
|Range||Standard ranges are listed at left. Custom calibration ranges are available|
|Accuracy||±0.1% FS for 0.7 – 7 bar sensors, ±0.3% FS for 17 and 35 bar sensors|
|Maximum Pressure||1.5 x rated range|
|Filter||50-micron, sintered stainless steel. A ceramic 1-bar high-air entry filter can be ordered for standard and heavy-duty piezometers by specifying part number 60101240 in addition to the piezometer part number|
|Temperature Coefficient||< 0.04% FS per °C|
|Size||Push-In: 35 x 270 mm (1.385 x 10.5″)|
|Weight||Push-in: 1.2 kg (2.75 lb).|
|3.5 bar (50 psi) Piezometer||52621020|
|7 bar (100 psi) Piezometer||52621030|
|10 bar (150 psi) Piezometer||52621060|
|17 bar (250 psi) Piezometer||52621040|
|35 bar (500 psi) Piezometer||52621050|
|Adapter for EW Drill Rod||50718042|