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We offer the best product range of Vibrating Wire Load Cells.

Vibrating Wire Load Cells

ApplicationsThe measurement and control of load including: Load in rockbolts, tie backs, foundation anchors and tunnel support Tension in cable anchors and multistrand tendon anchors

Operating PrincipleThe vibrating wire load cell comprises a set of three or six vibrating wire gauges, mounted parallel to each other equally spaced in a ring in an alloy steel cylindrical housing. The method of construction results in a very robust instrument suitable for use where high performance, longevity and mechanical strength are important. A heavy gauge, multicore, sheathed cable connects the cell to the readout unit. The mode of operation is by electrical plucking of the vibrating wire. The change in load acting on the load cell is proportional to the difference of the squared frequency of vibration for the corresponding load. The readings are taken on EKE 871, EKE 875 or EKE 878 Dataloggers

Advantages

Accurate, robust and very good long term stability Negligible temperature effects compared with oil filled load cell
Fast response time
Accuracy unaffected by cable length
Suitable for remote readings
Capable of reading eccentric loads
Common readout for all vibrating wire type instruments

The vibrating wire load cell comprises a set of three or six vibrating
wire gauges, mounted parallel to each other equally spaced in a ring in
an alloy steel cylindrical housing. The method of construction results
in a very robust instrument suitable for use where high performance,
longevity and mechanical strength are important. A heavy gauge,
multicore, sheathed cable connects the cell to the readout unit. The
mode of operation is by electrical plucking of the vibrating wire.
The change in load acting on the load cell is proportional to the
difference of the squared frequency of vibration for the corresponding
load. The readings are taken on EKE 871, EKE 875 or EKE 878 Dataloggers

Advantages

Accurate, robust and very good long term stability
Negligible temperature effects compared with oil filled load cell
Fast response time
Accuracy unaffected by cable length
Suitable for remote readings
Capable of reading eccentric loads
Common readout for all vibrating wire type instruments

InstallationTensile loads in rockbolts and cables are measured by installing Centre Hole load Cells between the rock/concrete face and the tensioning nut of the bolt or anchor. For the most reliable results, a concrete bearing pad should be cast, with its upper face flat and perpendicular to the bolt or cable. A bearing plate is placed beneath the cell to spread the load and to take up any residual nonalignment. A further bearing plate is placed between the cell and anchor. The assembly is centralised and held in place by applying a small tension to the bolt or cable. Fault in centralisation or alignment will be apparent from differences in load readings at each of the vibrating wire gauges in the cell. In situations where speed of installation is important, the bearing pad may be formed using high alumina cement or resin grout. Readings of the vibrating wires are averaged to obtain the bolt or cable tension. In multi-strand cable anchors, it is possible to tension the strands uniformly, by monitoring and balancing the oad reading for each of the vibrating wire gauges.

EKE 831 to EKE 836Comprising alloy steel cylinder with three gauges at 120º in the cylinder walls. Each gauge is fixed with non-slip cylindrical end clamps. Electromagnetic pulsing and sensing units with, over voltage surge arrestors are mounted adjacent to each wire on the outer face of the cylinder. The entire unit is then protected by an outer zinc plated steel sleeve with ‘O’ ring seals.
Same as EKE 831 to EKE 836, but with six parallel Vibrating Wire Gauges, located 60º apart in cylinder wall. Centre Hole Bearing Plates Centre Hole Bearing Plates comprising epoxy painted steel discs with central hole for use with EKE 831 to EKE 839 load cells for monitoring tension in rockbolt or cable anchors. The plates incorporate three location dowels to assist concentric mounting of the load cell. Details of dimensions as tabulated

Installation Accessories

EKE 83131 Connecting Cable
For use with EKE 831 to EKE 836 Vibrating Wire load Cells. Six Conductor Copper Wire, insulated colour coded and screened with sheathing
EKE 83731 Connecting Cable for use with EKE 837 to EKE 839 Vibrating Wire load Cells, twelve Conductors, copper wire insulated, colour coded and screened with sheathing
EKE 83125 Splicing Set To be used with EKE 83131connecting cable
EKE 83725 Splicing Set To be used with EKE 83731 connecting cable

Product Code: EKE 837 to EKE 839

Details

Same as EKE 831 to EKE 836, but with six parallel Vibrating Wire Gauges, located 60º apart in cylinder wall. Centre Hole Bearing Plates
Centre Hole Bearing Plates comprising epoxy painted steel discs with central hole for use with EKE 831 to EKE 839 load cells for monitoring tension in rockbolt or cable anchors. The plates incorporate three location dowels to assist concentric mounting of the load cell. Details of dimensions as tabulated :

Installation Accessories

EKE 83131 Connecting Cable
For use with EKE 831 to EKE 836 Vibrating Wire load Cells. Six Conductor Copper Wire, insulated colour coded and screened with sheathing
EKE 83731 Connecting Cable for use with EKE 837 to EKE 839 Vibrating Wire load Cells, twelve Conductors, copper wire insulated, colour coded and screened with sheathing
EKE 83125 Splicing Set To be used with EKE 83131connecting cable
EKE 83725 Splicing Set To be used with EKE 83731 connecting cable

Graph

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Dimensions And Range

Catalogue No.	Working Load (kN)	Overall* Dia (mm)	Centre Hole	Height (mm)
EKE 831	250	102	40	80
EKE 832	500	121	50	80
EKE 833	500	152	90	80
EKE 834	1000	146	50	80
EKE 835	1000	165	90	80
EKE 836	1500	220	150	80
EKE 837	2000	275	190	80
EKE 838	3000	292	190	80
EKE 838	4000	292	190	80

Centre Hole Bearing Plates - Dimensions

Catalogue No.	Working Load (kN)	Overall* Dia (mm)	Centre Hole	Height (mm)
EKE 83101	EKE 831	103	40	23
EKE 83201	EKE 832	113	50	33
EKE 83301	EKE 833	143	90	33
EKE 83401	EKE 834	136	50	43
EKE 83501	EKE 835	163	90	43
EKE 83601	EKE 836	218	150	48
EKE 83701	EKE 837	262	190	58
EKE 83801	EKE 838	278	190	63
EKE 83901	EKE 839	292	190	68

Dimensions And Range

Catalogue No.	Working Load (kN)	Overall* Dia (mm)	Centre Hole	Height (mm)
EKE 831	250	102	40	80
EKE 832	500	121	50	80
EKE 833	500	152	90	80
EKE 834	1000	146	50	80
EKE 835	1000	165	90	80
EKE 836	1500	220	150	80
EKE 837	2000	275	190	80
EKE 838	3000	292	190	80
EKE 838	4000	292	190	80

Centre Hole Bearing Plates - Dimensions

Catalogue No.	Working Load (kN)	Overall* Dia (mm)	Centre Hole	Height (mm)
EKE 83101	EKE 831	103	40	23
EKE 83201	EKE 832	113	50	33
EKE 83301	EKE 833	143	90	33
EKE 83401	EKE 834	136	50	43
EKE 83501	EKE 835	163	90	43
EKE 83601	EKE 836	218	150	48
EKE 83701	EKE 837	262	190	58
EKE 83801	EKE 838	278	190	63
EKE 83901	EKE 839	292	190	68