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Standard Vibrating Wire Piezometer

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 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.

Specifications
Sensor type Pluck-type vibrating wire sensor with built-in thermistor
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 19 x 195 mm (0.75 x 7.75")
Weight 0.16 kg (0.3 lb).
Signal cables

Standard: Shielded cable with four 22-gauge tinned-copper conductors and polyvinyl chloride (PVC) jacket

Armoured: Shield cable with four 22-gauge tinned-copperconductors, inner polyurethane jacket, steel braid armor, and outer high-density, polyethylene jacket. For heavy duty piezometer only

Models
Standard VW Piezometers
52611020 3.5 bar (50 psi) Piezometer
52611030 7 bar (100 psi) Piezometer
52611060 10 bar (150 psi) Piezometer
52611040 17 bar (250 psi) Piezometer
52611050 35 bar (500 psi) Piezometer
50613824 Signal cable

 

VW Piezometers with cable
Standard VW Piezometers, 3.5 bar (50 psi) with 15 m (50') cable 52611028
with 30 m (100') cable 52611024
with 45 m (150') cable 52611027
with 60 m (200') cable 52611026
Standard VW Piezometers, 7 bar (100 psi) with 30 m (100') cable 52611033
with 45 m (150') cable 52611034
with 60 m (200') cable 52611035
with 90 m (300') cable 52611036

 

 

 

 

Manual and specifications