The KIS/KOS load cell family.
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The KIS/KOS load cell family. |
Process weighing is only one of the many applications for Vishay Nobel load cells, force transducers,
pressure transducers, strain gauges and associated instrumentation.
Many of these applications also use the unique properties of the KIS and KOS family of shear beam
load cells and Vishay Nobel’s high accuracy microprocessor based load cell instrumentation.
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| KIS shear beam load cell showing the forces that can be applied. |
The KIS can be thought of as a load bearing pin, with a very clearly defined bi-directional measuring axis in one plane, and at 90 degrees to this plane an axis which can support the same force as the measuring axis but which produces no output.
To put it another way the KIS can sustain 100% side load without error or damage. It can also sustain 100% safe overload in its measuring axis, and the loading point can move its position along the measuring end of the pin with no change in the output sensitivity. It can therefore be used as a support for a structure, assembly or component on which it is required to measure force or weight.
Click Here to request further information on KIS/KOS load cells.
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| Web tension roll supported by KIS as a stub axle |
The KIS can be used as a stub axle to support one or both ends of a roll over which the web passes.
The tension in the web together with the angle of wrap produces a resultant force at a particular
angle. The KIS is rotated in its mounting to align with this resultant force. For example a vertical
wrap angle of 180 degrees produces a resultant which is vertical so that in aligning the measuring axis
vertically both the tension force and deadweight of the roll are in the same axis. If the wrap angle is
90 degrees (in horizontally and out vertically) the resultant is at 45 degrees, so the KIS is rotated in its
bracket so that its measuring axis is aligned to 45 degrees. When the wrap angle is horizontal 180 degrees
(in and out in the horizontal plane) then the KIS measuring axis is aligned horizontally and its side
axis supports the dead weight of the roll –without error.
In this mode, two KIS 10kN (1 tonne) capacity shear pin load cells will therefore measure a
horizontal tension of up to 2 tonnes and support and ignore the deadweight of the roll of up to 2
tonnes!
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Other ways of mounting the KIS to measure web tension use the KIS in a TMU (Tension Measuring Unit) or FMU (Force Measuring Unit) mechanical arrangement which support the existing bearings of a roll to measure tension. This obviates having to modify the roll and is particularly useful in paper machines with large heavy rolls but with the same advantage of being able to align the KIS measuring axis with the maximum component of tension anywhere from 0 through 360 degrees. |
| FMU Web Tension Assembly |
The stainless steel GLT Web Tension Load Cell measures low resultant tension forces with small wrap angles.
Designed for applications such as winders, unwinders, rewinders, coaters, laminators and printing presses, these units perform superbly where a high roll weight/ low tension ratio is required. |
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Click Here for further information on the GLT Web Tension Load Cell.
This is another example of the KIS’s ability to support an object on its side axis and measure forces at 90 degrees to this. A drum winch or a linear engine on a cable laying ship can be mounted on four or six KIS shear force load cells with their measuring axes horizontal and the deadweight supported on the (vertical) side axis of the KIS. Using this technique it is possible to constantly monitor the cable tension and, by means of a pitch compensation system, correct for changes in the tension due to the movement of the ship in the swell. Typically, the drum winch can weigh up to 60 tonnes and control a tension of up to 40 tonnes. However it could be required to run with a cable tension of 0.5 tonnes or lower.
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| Linear Engine |
Drum winches, and linear engines are used on board ship for laying communication cables at sea and controlling the tension of such cables. It is enough of a problem that too high a tension would cause a break, requiring an expensive join, but if fibre optic cable is laid at the wrong tension, even if it doesn't break, the optical transmission properties could still be destroyed. Then the only remedy would be to lay the whole over-tensioned length again with new cable, therefore tension measurement and thus control is of vital importance.
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| Pipe Laying Ship |
The same principle is used on Pipe Laying Ships where the Pipe Tensioner Assembly is mounted on KIS shear pins. This tensioner often has an arrangement where it can be tilted to lay pipes at any angle from horizontal to vertical off the stern of the ship.
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| Jet Engine Thrust Test Bed |
Jet engine thrust is normally measured horizontally by supporting the engine with two KIS load cells
either via a small intermediate frame or directly on its support trunnions. The dead weight of the
engine is supported as a side load on the KIS beam and, as the load cell is insensitive to side
loads, only the engine thrust (forward or reverse) is measured. This is a unique application for KIS
that would be impossible with any other type of load cell.
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| Crane pulley incorporating KIS load cell |
The round KIS shear pin can be used as a load measuring axle on pulley and therefore can be installed as an integral part of the crane hook assembly. In some cases the KIS-D double-ended shear pin is used, supported at either end with the load applied in the centre supporting a compensating sheave or pulley.
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| Two crane hooks, with telemetry, weighing an aircraft wing section to determine centre of gravity |
In cases where a cable connection to the crane hook assembly would be impractical, we can supply a battery powered system equipped with a telemetry system for data transmission to a remote base station.
Click Here to request further information on KISD load cells.
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The Model FTS 3 Load Cell Indicator together with any Vishay Nobel or other Force Standard Calibrated Load Cell can be used in the calibration of :-
It is a self contained mV/V indicator with its own built in power supply. It has high accuracy, stable, ratiometric mV/V (or µV/V)display with a resolution of 0.00001 mV/V and a range of 700,000
displayed counts. It features a display freeze and peak hold, stored print and RS232 and RS 485 digital outputs.
Click Here to request further information on FTS 3.
Some of the many other applications for Vishay Nobel transducers and instrumentation have included:
Contact.
For further details please e-mail us at:
Cliff.Evans@vishaymg.com or
Telephone Cliff Evans on +44 (0)1274 782229
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