Loadcells
Various types of loadcells,
pressure sensors and gauges are used in manufacturing, processing and testing industries. The food processing industry uses loadcells to measure ingredients out precisely and for product distribution during packaging. Industrial warehouse environments where pallets of inventory are shuffled around often use loadcells to determine the precise weight of loaded pallets, which is crucial for filling and accepting orders. Other loadcell applications include the testing of bridge building materials like beams for tension strength, as well as in railcar weighing and truck scales. They are important components in calibration systems, and are also used in fatigue testing for research and development laboratories. Some of these applications require a loadcell as large as a hundred tons, while other applications, such as the load cell used to measure blood pressure in a medical setting, can be as small as a gram. Also, some of these uses require a loadcell to be part of a larger system, such as a force transducer.
The most common type of loadcell uses
strain gauges, which are very small devices that measure the strain of an object by converting internal deformation into electrical signals to precisely measure weight, force or strain.
Force gauges use strain gauges in push-pull testing and flow measurement. While most loadcells measure and test with strain gauges, some are piezoelectric sensors, which use quartz crystals to measure weight, strain, movement and vibrations. The sensors are attached by circuits, in a formation developed in the early eighteen hundreds called the Wheatstone bridge equation, which basically used multiple sensors to get more accurate readings and measurements. Many of these sensors, although quite small, are built to support or hold as much as several tons, while
miniature loadcells are built to provide precise measurement for much smaller applications. After loadcells transduce mechanical stress into electrical energy, the information that they monitor is then signaled to a recorder or other computerized data collection system. Loadcells use analog or digital technology for the recording and transferring of information.
