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 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.

Please refer to the ordering information tab below before making your selection.

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Ordering Information
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Heavy-Duty VW Piezometers	Part Number
3.5 bar (50 psi) Piezometer	52610520
7 bar (100 psi) Piezometer	52610530
10 bar (150 psi) Piezometer	52610560
17 bar (250 psi) Piezometer	52610540
35 bar (500 psi) Piezometer	52610550
Signal Cable, Armored	50613586
Readout & Terminal Boxes
VW Data Recorder	52613500
Jumper Cable for Terminal Box	52613557
Terminal Box for 6 Sensors	57711606
Terminal Box for 12 Sensors	57711600
Terminal Box for 24 Sensors	97711624
Data Loggers
VW MiniLogger for 1 Sensor	52613310
4-Channel V-Logger	52615140
Campbell Scientific Data Loggers

SIGNAL CABLE SPECIFICATIONS
Signal Cable	50613824	Shielded cable with four 22-gauge tinned-copper conductors and polyvinyl chloride (PVC) jacket armored
Heavy Duty Signal Cable	50613586	Shield cable with four 22-gauge tinned-copper conductors, inner polyurethane jacket, steel braid armor, and outer high-density, polyethylene jacket. For heavy-duty piezometer only

VW Piezometer 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	Standard: 19 x 195 mm (0.75 x 7.75″) Low-Pressure: 29 x 191 mm (1.125 x 7.5″). Heavy-Duty: 29 x 191 mm (1.125 x 7.5″). Push-In: 35 x 270 mm (1.385 x 10.5″)
Weight	Standard: 0.16 kg (0.3 lb). Low pressure: 0.45 kg (1 lb). Heavy duty: 0.8 kg (1.75 lb). Push-in: 1.2 kg (2.75 lb).

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 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.