E31.2 E32.2

Vibrating Wire Piezometer

Vibrating Wire Piezometer, Geosense, VWP-3000 Series

Geosense® VWP-3000 Series of Vibrating Wire Piezometers use the well-proven method of converting fluid pressures on a sensitive diaphragm into a frequency signal.
Frequency signals are particularly suitable for the demanding environment of Civil Engineering applications, since the signals are capable of long transmission distances without degradation, tolerant of wet wiring conditions and resistant to external electrical noise.

Working principle

The VW Piezometer operates on the principle that a tensioned wire, when plucked, vibrates at its resonant frequency. Around the wire is a magnetic coil which when pulsed by a vibrating readout or data logger interface plucks the wire and measures the resultant resonant frequency of vibration. A change in distance between the anchor and the diaphragm is related to pressure differentials and can be converted to a kPa reading.
Temperature information can be used if logging regularly to determine swift temperature changes during which pressure readings may be exaggerated

Features

  • Reliable long-term performance 
  • Rugged, suitable for demanding environments 
  • High accuracy 
  • Insensitive to long cable lengths 
  • All non-drive-in models can have threaded adaptors to customer specifications


Applications

  • Pore pressure measurement in soils and rocks 
  • Fluid pressures in hydro-fracture and pump tests

Specifications

VWP-3000 Vibrating Wire Piezometers may be read by the VW-2106 or any vibrating wire readout device and may be readily connected with data loggers with vibrating wire interface modules.
Vibrating wire piezometers output a frequency signal and are therefore insensitive to resistance changes in connecting cables caused by contact resistance or leakage to ground.
Cable may be readily and simply extended on site without special precautions. Gauges may be read up to 1000 metres away from their installed location.

VWP-3000, Vibrating Wire Piezometer, Standard ConstructionVWP-3000 *

Standard construction to measure groundwater elevations and pore pressures.

VWP-3100, Vibrating Wire Piezometer, Heavy DutyVWP-3100 *

Heavy duty body for direct burial in fills and dam embankments.

VWP-3200 *

Low pressure version to measure groundwater elevations and pore pressures.

VWP-3200, VWP-3300, Vibrating Wire Piezometer, Low Pressure

VWP-3300 *

A low pressure vented version to compensate for barometric pressure changes

VWP-3400

VWP-3400, Vibrating Wire Piezometer, Heavy Duty Drive In

Heavy duty Drive-in Type 1 featuring inclined ports to minimise smearing affects.

VWP-3500

VWP-3500, Vibrating Wire Piezometer, Slim Line Drive In

Slim line Drive-in Type 2 featuring large surface area porous filter.

* Available with High or Low air entry filter 

Specifications 

 

 

Type

Description

Pressure Range kPa

Over Range

Resolution

Accuracy

Non-Linearity

Temp Range

Thermal Effect

Diameter X Length

Weight

VWP-3000

Standard LAE

345, 518, 690, 1034, 2068, 3447, 5171, 6895 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

20x140 mm

210 g

VWP-3001

Standard HAE

345, 518, 690, 1034, 2068, 3447, 5171, 6895 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

20x140 mm

210 g

VWP-3100

Heavy Duty LAE

345, 518, 690, 1034, 2068, 3447, 5171, 6895 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

25x151 mm

450 g

VWP-3101

Heavy Duty HAE

345, 518, 690, 1034, 2068, 3447, 5171, 6895 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

25x151 mm

450 g

VWP-3200

Low Pressure LAE

70, 173 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

25x151 mm

600 g

VWP-3201

Low Pressure HAE

70, 173 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

25x151 mm

600 g

VWP-3300

Low Pressure Vented LAE

70, 173 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

25x151 mm

600 g

VWP-3301

Low Pressure Vented HAE

70, 173 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

25x151 mm

600 g

VWP-3400

Drive In Type 1

345, 518, 690, 1034, 2068, 3447, 5171, 6895 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

35x218 mm

1335 g

VWP-3500

Drive in Type 2

345, 518, 690, 1034, 2068, 3447, 5171, 6895 kPa

2 X Rated Pressure

0.025% FS

±0.1% FS

<0.5% FS

-20 to

+80 oC

<0.05 % FS/ oC

33 x 470 mm

2100 g

 

Description 

Materials  Stainless Steel
Excitation Pluck or Swept Frequency
Over Voltage Protection 90 V gas plasma arrester
Thermistor 3k Ohms @ 25oC
Range 2200-3500 Hz
Nominal Zero Value 3130 Hz
Thermal Effect 0.05% FS / oC

 

Ordering Information

  • Type
  • Cable length
  • Pressure Range

VIC:

Melbourne

This email address is being protected from spambots. You need JavaScript enabled to view it.

t (03) 9938 3830

f (03) 9938 3899

m 0428 315 502

NSW:

Sydney

e This email address is being protected from spambots. You need JavaScript enabled to view it.

t (02) 9986 1857

m 0418 381 709

QLD:

Brisbane

e This email address is being protected from spambots. You need JavaScript enabled to view it.

t (07) 3040 6166

m 0419 477 715

 

WA:

Perth (Head Office)

e This email address is being protected from spambots. You need JavaScript enabled to view it.

t (08) 9322 4020

m 0408 034 668

Linked In YouTube Google Plus