The earliest pre-strain gauge load sensors include hydraulic an

  •   The origin of weighing transducer

      Before strain gauge-based force sensors became the preferred method for industrial weighing applications, mechanical lever scales were widely used. Mechanical scales can weigh everything from pills to train cars, and if properly calibrated and maintained, they can be weighed accurately and reliably. The method of operation may involve using a weight balance mechanism or detecting the force generated by a mechanical lever. The earliest pre-strain gauge load sensors included hydraulic and pneumatic designs.

      In 1843, the British physicist Sir Charles Wheatstone designed a bridge circuit that could measure resistance. Wheatstone bridge circuits are very suitable for measuring 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 electronic technology caught up that the new technology became technically and economically feasible. However, since then, the number of strain gauges as components of mechanical scales and independent load cells has proliferated.

      Today, except for some laboratories that still use precision mechanical balances, strain gauge load cells dominate the weighing industry. Sometimes weighing transducers are used in places that require intrinsic safety and hygiene, and hydraulic load cells are considered in remote areas because they do not require power. The weighing transducer provides an accuracy of 0.03% to 0.25% of full scale and is suitable for almost all industrial applications.

      In applications that do not require high accuracies, such as bulk material handling and truck weighing, mechanical platform scales are still widely used. However, even in these applications, the forces transmitted by mechanical levers are often detected by load cells because of their inherent compatibility with computer-based digital instruments.

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