# An Electronic Device Used To Measure The Weight

A load cell is an electronic device used to measure the weight or force exerted on it. It is commonly used in various applications, from weighing machines to industrial and agricultural machinery. Load cells work on the principle of converting force or weight into an electrical signal. This article will discuss the working principle, types, applications, and advantages of load cells.

## Working Principle of Load Cell:

The load cell operates on the principle of the strain gauge. The strain gauge is a small sensor that detects the changes in resistance that occur when an object is subjected to stress or strain. For example, when an object is subjected to a load, it undergoes deformation, changing its resistance. The strain gauge detects this change in resistance, and the output signal is then processed to calculate the weight or force being applied.

Depending on their working principle, accuracy, and application, various load cell types are available in the market. Some of the commonly used load cells are:

• Hydraulic Load Cells: These load cells work on the principle of hydraulic pressure. When applied to the load cell, a load generates pressure on a hydraulic fluid, which is measured to calculate the weight or force.
• Pneumatic Load Cells: These load cells work on the principle of pneumatic pressure. When applied to the load cell, a load generates pressure on a gas, which is measured to calculate the weight or force.
• Strain Gauge Load Cells: These load cells work on the strain gauge principle. When a load is applied to the load cell, it generates a deformation detected by the strain gauge, and the output signal is processed to calculate the weight or force.
• Capacitive Load Cells: These load cells work on the principle of capacitance. When a load is applied to the load cell, it changes the distance between the plates, resulting in a change in capacitance. The output signal is then processed to calculate the weight or force.

Load cells are used in various applications, some of which are:

• Weighing machines: Load cells are used in weighing machines to measure an object’s weight accurately.
• Industrial machinery: Load cells measure the force being applied to a machine.
• Agricultural machinery: Load cells measure the force being applied to a machine.
• Medical equipment: Load cells are used to measure a patient’s weight.