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Similar in operation to strain gauges, piezoresistive load sensors generate a high level output signal, making them ideal for simple weighing systems because they can be connected directly to a readout meter.
Other load cells are fading into obscurity, as strain gauge load cells continue to increase their accuracy and lower their unit costs.
Strain gauge load cells offer accuracies from within 0.03% to 0.25% full scale and are suitable for almost all industrial applications.
Before strain gauge based load cells became the method of choice for industrial weighing applications, mechanical lever scales were widely used.
Except for certain laboratories where precision mechanical balances are still used, strain gauge load cells dominate the weighing industry.
Pneumatic load cells are sometimes used where intrinsic safety and hygiene are desired, and hydraulic load cells are considered in remote locations, as they do not require a power supply.
The Wheatstone bridge circuit is ideal for measuring the resistance changes that occur in strain gauges.
Although the first bonded resistance wire strain gauge was developed in the 1940s, it was not until modern electronics caught up that the new technology became technically and economically feasible.Output is linear and relatively unaffected by the amount of the filling fluid or by its temperature.If the load cells have been properly installed and calibrated, accuracy can be within 0.25% full scale or better, acceptable for most process weighing applications.As force increases, the pressure of the hydraulic fluid rises.This pressure can be locally indicated or transmitted for remote indication or control.Additionally, they contain no fluids that might contaminate the process if the diaphragm ruptures.