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Push-In Piezometers

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.

Advantages

High Resolution

VW piezometers provide a resolution of 0.025% of full scale.

 

High Accuracy

Slope Indicator’s automated, precision calibration system ensures that all VW piezometers meet or exceed their accuracy specifications.

 

Groutable

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.

 

Rapid Response

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.

 

Temperature Measurement

All VW piezometers are equipped with a temperature sensor.

Specifications
Sensor Type Pluck-type vibrating wire sensor with built-in thermistor
Range Standard ranges are listed at left. Custom calibration ranges are available
Resolution 0.025%FS
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
Materials Stainless steel
Size Push-In: 35 x 270 mm (1.385 x 10.5″)
Weight Push-in: 1.2 kg (2.75 lb).
Models
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
Signal Cable 50613824
Adapter for EW Drill Rod 50718042
EW Coupling 50718010
Product Datasheet and Manual