Today, one of the most common devices used in industrial measurement applications is the load cell. A loadcell is a sensor that measures the force generated when placed on or attached to a material. The load cell can have two parallel plates or a cylindrical structure. When a material or object is placed between these plates or cylinders, the load cell deforms and is used to measure the resulting force.
Loadcell is an easy-to-use and sensitive device. To make accurate measurements, the loadcell must be installed and calibrated correctly. Loadcells are used to measure weight, tension, pressure and torque.
The loadcell used to measure weight produces an electrical signal associated with the weight. This signal can be read with an analog or digital reading device. The loadcell transfers the weight to an interface card or PLC and displays the results on a computer screen. These measurements are used in industrial weighing applications, typically for measuring heavy loads.
Loadcells come in three main types: voltage type, capacitive type and pressure type. Tension type loadcells measure force using tensile or bending tension. Capacitive type loadcells detect the force by measuring the capacitance between the plate. Pressure type loadcells measure the pressure between the plates to measure the force.
There are some factors to consider when using loadcells. For example, it is important to perform correct calibration, ensure proper mounting, and not overload the load cell. Additionally, environmental factors such as humidity and temperature can have an impact on the measurement results. Therefore, the sensitivity of loadcells to environmental factors should also be taken into consideration.
The advantages of loadcells include accuracy, high sensitivity, reliability, durability and long life. Besides these, loadcells provide fast and accurate results, shortening processing time and increasing productivity.
One of the methods used in loadcell measurement is the Wheatstone bridge method. In this method, the load acting on the load cell is measured through a strain sensor connected to the Wheatstone bridge.
The Wheatstone bridge is a circuit consisting of four resistors. The load cell is included in this circuit as a bridge element and the bridge is kept in balance. When the load on the load cell increases, the stress values in strain gauges change. This change disrupts the bridge balance and the current flow through the bridge changes. This current change can be used to measure the load on the load cell.
This measurement method gives the output value of the measured load as voltage. This voltage is made readable by amplifiers or measuring devices. Amplifiers required for load cell measurement vary in their sensitivity and output range. Therefore, when choosing a load cell, the characteristics of the amplifier to be used should also be taken into consideration.
Another factor to be considered in load cell measurement is the correct connections. Since load cells and strain gauges are precision devices, measurement results may be affected if they are not connected correctly. For this reason, it is recommended that the connections be made correctly and, if necessary, installed by an expert technician.
Loadcell measurement is a widely used method in industrial applications requiring high precision. Load cell selection, measurement methods and correct connections are important to obtain accurate results.