Load Cell Circuit

As the force applied to the load cell increases the electrical signal changes proportionally. Most load cell circuits are setup in a wheatstone bridge configuration which is a simple circuit commonly used to measure an unknown resistance. Specifically load cells are force transducers converting the kinetic energy of a force such as tension compression pressure or torque into a measurable electrical signal.

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Here the two scheme diagram of load cell amplifier circuit.

Load cell circuit.

As we know load cell amplifier is pretty expensive with fair price range of 100 300 usd. The sensitivity of a strain gauge is rated in mv v meaning the maximum output is a function of the excitation voltage. You may built your own load cell amplifier to get the lower cost. It converts a force such as tension compression pressure or torque into an electrical signal that can be measured and standardized.

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. The most common types of load cell used are hydraulic pneumatic and strain gauge. Except for certain laboratories where precision mechanical balances are still used strain gauge load cells dominate the weighing industry.

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. A load cell or loadcell is a transducer which converts force into a measurable electrical output. The strength of the signal changes in proportion to the force applied. 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.

A load cell is a force transducer.