Which of the following measure tank levels using the material weight applied to the device? A. Differential pressure transmitters B. Pressure gauges C. Strain gauges (load cells) D. Pressure transducers

The correct answer is C. Strain gauges (load cells).<br /><br />Strain gauges, also known as load cells, are devices that measure the weight of the material in the tank. They work by converting the mechanical force (weight) into an electrical signal. When the material in the tank exerts a force on the strain gauge, it causes the gauge to deform. This deformation is then measured and converted into an electrical signal that can be used to determine the weight of the material in the tank.<br /><br />Differential pressure transmitters (option A) and pressure transducers (option D) measure the pressure difference or pressure in the tank, respectively. Pressure gauges (option B) are simple devices that measure the pressure in a tank. However, they do not directly measure the weight of the material in the tank.