Scales and Load Cells


A scale is a set of notes, each of which represents a specific interval pattern. Scales are also defined by a specific tonic, the first note in its octave.

Whenever researchers use an existing scale, they need to ensure that the construct it measures reasonably matches the context in which they intend to deploy it. This involves conducting a fit assessment, validating the scale and reporting its usage.


The scale function maps discrete input values to bands defined by domain array and range array. The domain array contains the input values and the range array defines the maximum and minimum values of the bands (taking into account any padding).

A scale is a ratio that represents the relationship between dimensions of a model or scaled figure and the corresponding dimensions of an actual figure or object. Scales are used in blueprints and maps, for example. They are also used when creating bar charts.

In music, scales are a pattern of pitch classes, or notes, that is repeated over an octave. Each specific scale has a characteristic interval pattern and begins and ends with a particular note, called the tonic. Many scales are named after the tonic, such as C major. Others are named after their interval patterns, such as the Phrygian dominant scale, which is constructed from a set of seven pitches in a circular arrangement.


Scale is the ability to resize something to a handy, workable size. This can be as small as a sheet of paper or as large as a garden.

The simplest scales make use of objects of known mass (or weight) and add more and more until static equilibrium is achieved, at which point the plates of the scale level off. More accurate digital scales rely on strain gauge technology to determine highly precise measurements. Strain gauge scales essentially consist of thousands of small S-shaped transducer beams, or load cells, under the flat tray on the weighing platform.

As the weight is added, these S-shaped beams bend in proportion to the weight and send an electrical signal through a bridge circuit to the digital display. The microchip in the scale converts this deformation into intelligible numbers, and that is how you read the weight of an item on a modern digital scale. The digital signals are regulated by the standards agencies of most countries to ensure their accuracy.

Weight Indicator

The weight indicator displays and manages the weight data a scale platform detects. It can also act as a scale controller, depending on the programming in place. METTLER TOLEDO offers a wide range of weight indicators, including digital indicators, intrinsically safe indicators and remote display indicators.

Digital weight indicators convert the force exerted on a scale’s load cell into an electrical signal. They have inbuilt processors and signal conditioners that transform the physical data into an electronic one suitable for display on a LCD screen.

The weight indicator has silicon based electronics and solid-state devices similar to those used in computers. Tin, silver and gold leads and circuit boards made of fiberglass or plastics work to normalize electricity flow, store and process information for display. Some indicators have oversized LCD screens designed for viewing at a distance, or are designed to operate in washdown environments. Choose the indicator that is right for your application. It should match the size of your weighing product or container, and have features that fit the requirements of your industry.

Load Cell

Load cells are essential components of mechanical scales that transform weight or force into an electrical signal. They resemble small metal frames with strain gauges that flex when a linear force is applied to them. The change in resistance can then be measured to determine the load.

Load cell sensors come in multiple shapes to accommodate a wide range of applications. There are two main types: bending beam and shear beam. Both types have similar internal construction but they differ in the elastic element. The bending beam has a reduced cross-section where the strain gauges are bonded, while the shear beam is machined all the way through and uses a diaphragm.

The sensors can be prone to various challenges such as varying temperature that may cause the strain gauges to expand and contract, thus creating noise. They are also prone to corrosion. Other issues that can arise include mechanical damage to the sensor and wiring. These can cause signal offset and hysteresis.

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