Wednesday, January 26

Different Mechanisms Used In Weighing Scales

A weighing scale or a weighing machine is one of the most basic check weigher machine   equipments we use in our daily lives. Be it in our bathroom to keep a check on our weight, to measure ingredients before baking a cake, or in huge industries while handling huge assignments, weighing scales are something that are very basic and we cannot do without them. Though we use it quite often, none of us are aware of the mechanism or the technology that is used in them. There are two types of weighing scales – first is the old conventional one that works on a simple mechanism whereas the second one is the digital scale which has a more complicated technology used and is relatively expensive than the previous one. Here are is a short history and basic information about weighing scales and technology used in them.

The weighing scales are something that has been used for a very long time and the first way to use it was to balance it using a strong string. That is the first application of the weighing scale. As the time passed and new mechanisms and technologies came up, weighing machines also evolved with the changing needs and bigger assignments. There are a large number of scales available including analytical scales, industrial scales for heavier works, laboratory scales for extremely minute and accurate weighing and different technologies used in each of them. Mainly there are 4 different types of mechanisms used in weighing machines and lets discuss each of them in brief.

One of the four technologies is the tuning fork technology which uses the electromagnetic energy to weigh things. There is a use of a body that oscillates and through those oscillations the stability and the accuracy is measured with the help of the frequency and the vibration of the oscillations. The mechanism behind its working is that of the tuning forks and piano tuners use them.

The second is the force technology and it uses the mechanism of an electrical resistor. The weight is derived from the product of the deformation of resistor that has been glued to a deforming body made of aluminum and steel. As the object is placed on the weighing scale, a deformation occurs between the resistor and the metal strip which ultimately derives the weight of that object. There is a load-cell on which the special resistor is placed to measure the weight. This technology is one of the most widely used as it is affordable and has a good following in the industry.

Another technology that is quite frequently used in weighing scales is the electromagnetic force compensation. In this technology a counter force is formed by the use of a permanent magnet and a current-carrying coil. It is the same mechanism that is used in weighing pan and the central core which is surrounded by the magnet. The change in the coil current is responsible for the derivation of the weight. These weighing scales are the most accurate scales and are used in high-resolution assignments. Thus, they must not be exposed to high temperature and other extreme weather conditions.

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