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A load cell is typically an electronic device (transducer) that is used to convert a force into an electrical signal. This conversion is indirect and happens in two stages. Through a mechanical arrangement, the force to be sensed is deforming a strain gauge. The strain gauge converts the deformation (strain) to electrical signals. Normally, a load cell consists of four strain gauges in a wheatstone bridge configuration, but are also available with one or two strain gauges. The electrical signal output is normally in the order of a few millivolts and requires amplification by an instrumentation amplifier before it can be used. The output of the transducer is plugged into an algorithm to calculate the force applied to the transducer. Image File history File links Single point load cell File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
Image File history File links Single point load cell File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
A transducer is a device, usually electrical or electronic, that converts one type of energy to another. ...
Typical foil strain gauge. ...
This article is about the deformation of materials. ...
A Wheatstone bridge is a measuring instrument invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843. ...
Typical instrumentation amplifier schematic An instrumentation amplifier is a type of differential amplifier that has been specifically designed to have characteristics suitable for use in measurement and test equipment. ...
In mathematics, computing, linguistics, and related disciplines, an algorithm is a finite set of well-defined instructions for accomplishing some task which, given an initial state, will terminate in a defined end-state. ...
Although strain gauge load cells are the most common, there are other types of load cells as well. In industrial applications, hydraulic (or hydrostatic) is probably the second most common, and these are utilized to eliminate some problems with strain gauge load cell devices. As an example, a hydraulic load cell is immune to transient voltages (lightning) so might be a more effective device in outdoor environments.
Other types include piezo-electric load cells (useful for dynamic measurements of force), and vibrating wire load cells, which are useful in geomechanical applications due to low amounts of drift. peizo This page is a candidate for speedy deletion. ...
In telecommunication, a drift is a comparatively long-term change in an attribute or value of a system or equipment operational parameter. ...
Every load cell is subject to "ringing" when subjected to abrupt load changes. This stems from the spring-like behavior of load cells. In order to measure the loads, they have to deform. As such, a load cell is of finite stiffness and has spring-like behavior, exhibiting vibrations at its natural frequency. An oscillating data pattern can be the result of ringing. Ringing can be suppressed in a limited fashion by passive means. Alternatively, a control system can use an actuator to actively damp out the ringing of a load cell. This method offers better performance at a cost of significant increase in complexity. Various normal modes in a 1D-lattice. ...
It has been suggested that this article or section be merged with Control theory. ...
A three-dimensional actuator modelled using elastica theory. ...
Image File history File links S type load cell File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
Image File history File links S type load cell File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
Load Cell Types
- double bending beam
- shear beam
- column
- membrane
- ring torsion
- bending ring
- double shear beam
- pancake
- "S" beam
Applications - truck weighing
- tension measurement
- force measurement
- railcar weighing
- hopper, tank and vessel weighing
- onboard Weighing
- electronic Crane Scales
- wireless Crane Scales
- structural health monitoring
Structural health monitoring (SHM) is an upcoming technology in civil, structural and aerospace engineering. ...
External links
 A beam load cell, stainless steel |
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