Linked In YouTube Google Plus
E31.2 E32.2

Vibrating Wire Anchor Load Cells

Vibrating Wire, Anchor Load Cell, Geosense,VWLC 5000Geosense® VWLC 5000 series Vibrating Wire Anchor Load Cells consist of a cylinder of high strength steel with 3 to 6 vibrating wire strain sensors (depending on capacity) mounted parallel to the longitudinal axis arranged equidistant around the circumference to measure the compression of the cylinder under load.

They are manufactured with a centre hole to accommodate anchors, rock bolts and tendons.
With the multi sensor configuration it is possible to obtain accurate readings under mildly eccentric loading conditions as the sensors are read individually.

The readings from the individual sensors are averaged and when used in conjunction with a calibration factor, supplied with each cell, allow the applied load to be calculated.In multi strand anchors it is therefore possible to tension the strands uniformly by monitoring the load in each sensor as appropriate.

The abutment plate (to be sourced locally) is normally made to suit specific site requirements and load distribution plate pairs (supplied by PCTE) should be used to minimise eccentric loading and provide a smooth parallel bearing surface and evenly spread the load to the cell. These should be inserted between the load cell and the anchor head.

Working principle

A vibrating wire strain gauge operates on the principle that a tensioned wire, when plucked, vibrates at its resonant frequency. The square of this frequency is proportional to the strain in the wire.
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.
Deformation within the steel cylinder will cause the wire ends to move relative to each other. The tension in the wire will change accordingly thus altering the resonant frequency of the wire.
Temperature information can be used if logging regularly to determine swift temperature changes during which strain readings may be exaggerated

Features

  • High strength steel construction 
  • Load distribution plates available 
  • Proven long term accuracy 
  • Accommodates eccentric loading 
  • Multiple gauge system 
  • Data logger compatible 
  • Available with plug connector or cable
 

Applications

Measurement of load acting on:

  • Ground anchors 
  • Rock Bolts 
  • Tie-backs 
  • Struts 
  • Arch Supports 
  • Props

Specifications

Vibrating Wire, Anchor Load Cell, Load distribution plates

VWLC-5000 vibrating wire Anchor Load Cells may be read by the VW-2106 or any vibrating wire readout device and may be readily connected using any datalogger with vibrating wire interface modules.
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 without change in calibration.

Vibrating wire strain gauges output a frequency signal and are therefore insensitive to resistance changes in connecting cables caused by contact resistance or leakage to ground.

When ordering the following information is required:

  • Capacity
  • Cable Length
  • Load Distribution Plate
  • Connectors

 

VW Load Cell

 

Load Distribution Plates

Description

Specification

 

Capacity(kN)

ID(mm)

OD(mm)

Height(mm)

Thermistor

3k Ohms at 25 oC

 

300

30

64

30

Over range capacity

150% F.S.

 

500

50

86

30

Accuracy1

0.5% F.S.*

 

750

75

113

40

Resolution

0.05% F.S.

 

1000

112

148

40

Output

1200 - 2800 Hz

 

1500

150

190

50

Temperature range

-20°C to +80°C

 

2000

150

200

50

Material

High tensile, stress relieved steel

 

2500

150

210

50

 

Standard Dimension

Capacity(kN)

Sensors

ID(mm)

OD(mm)

Height(mm)

300

3*

30

58

100

500

3*

50

80

100

750

3*

75

107

100

1000

3*

112

142

100

1500

6

150

184

100

2000

6

150

194

100

2500

6

150

204

100


Accessories

  • Load distribution plates
  • Centraliser Bushings
  • Fly Connector
  • Cable End protector
  • Jump Cables

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