Load Cell Circuit

In bar strain gauge load cells the cell is set up in a z formations so that torque is applied to the bar and the four strain gauges on the cell will measure the bending distortion two measuring compression and two tension.

Load cell circuit.

A load cell is a force transducer. The most common types of load cell used are hydraulic pneumatic and strain gauge. Although there are many varieties of force sensors strain gauge load cells are the most commonly used type. A load cell is a type of transducer which is a device that converts energy from one form to another.

Complete circuit for a high precision load cell to manufacture a real high precision load cell it is necessary an additional circuitry to the strain gauges dedicated to the fine adjustment of the output signal at different loads and also to make the necessary individual thermal compensations during the manufacturing process. Most load cell circuits are setup in a wheatstone bridge configuration which is a simple circuit commonly used to measure an unknown resistance. You may built your own load cell amplifier to get the lower cost. Here the two scheme diagram of load cell amplifier circuit.

As the force applied to the load cell increases the electrical signal changes proportionally. The strength of the signal changes in proportion to the force applied. Except for certain laboratories where precision mechanical balances are still used strain gauge load cells dominate the weighing industry. It converts a force such as tension compression pressure or torque into an electrical signal that can be measured and standardized.

As we know load cell amplifier is pretty expensive with fair price range of 100 300 usd.