Daily Archives: August 12, 2020

Force Strain Gauge Sensor on Load Cell

Talking about the industry, of course, will be closely related to sensors. Currently, there are many types of sensors used in the industrial world such as electronics, robotics, etc., various sensors such as motion sensors, light sensors, temperature sensors, to force sensors. One type of force sensor that is used widely is a strain gauge. A strain gauge is a tool or sensor that functions to measure the pressure or weight of an object. In the industrial world, strain gauges have several functions, such as measuring weight on digital scales, measuring the increase in cracks in building walls in the construction industry, measuring the tension in a series of bridges, and many more.

So what is a load cell? What does this have to do with a strain gauge? The load cell is a sensor consisting of a strain gauge or more, which is attached to a metal rod in the shape of a ring. The number of strain gauge in a load cell can be adjusted as needed. The strain gauge on the load cell is made of grid foil. Grid foil is a long, thin wire arranged in a zigzag manner. Load Cell consists of several types such as single point, shear beam, compressed, S model, to double-ended. Each type of load cell has its characteristics and advantages.

What is the function of the strain gauge on the load cell? Here’s the explanation. When the Load Cell on a gravity gauge is given a load, there will be a change in the resistance value of the strain gauge. The strain gauge acts as a conductor attached to the membrane surface. When there is membrane stretching, the resistance automatically increases. The strain gauge functions as a sensor to measure the weight of large objects or items. Generally, this strain gauge sensor is found on weighbridges or truck scales. Physically, the strain gauge is a thin metal foil grid attached to the Load Cell surface. Due to the load on the Load Cell, a strain occurs, and then it is transmitted to the foil grid. The resistance of the grid foils changes with a value proportional to the load induction strain.

So, the conclusion is that the strain gauge is part of the Load Cell. The load cell will not function properly if the strain gauge is damaged. Weight gauges are always on Load Cell like a digital scale. The performance of a digital scale depends on the quality of the load cell. It’s a big disadvantage when choosing a scale if we don’t look at the quality of the load cell. Make sure you choose industrial scales such as hanging scales or pallet scales which is equipped with the best Load Cell system so that it is more durable and not easily damaged.