Load cells

Thanks to their very high measurement accuracy, the load cells or load cell series are suitable for use in automation technology or testing technology in addition to numerous OEM applications in weighing technology. As a manufacturer, we also offer optional versions with an extended temperature range, high overload protection and versions with ATEX approvals. If you have any questions about a load cell, please contact us on 08022 – 271667 or info@interfaceforce.de. We are at your disposal.

Interface force transducers and/or torque transducers are supplied with a calibration certificate as standard. The Interface Inc. calibration laboratory is A17025LA accredited (in accordance with ISO/IEC 2).. Both the A2LA (American Associations for Laboratory Accreditation) and, among others, the DAkkS (German Accreditation Body) have signed the multilateral agreement MRA (Mutual Recognition Arrangement) for the mutual recognition of accreditations at the ILAC (International Laboratory Accreditation Cooperation). > This means that the calibrations must be mutually recognized

Load cells are based on the principle of strain measurement.

It consists of a metal body that deforms elastically when loaded. This metal body is often designed in the form of a bending beam construction. Strain gauges are attached above and below the beam. These strips consist of thin metal foils that change their electrical properties when stretched due to resistance effects. When weight is applied to the load cell, the flexure beam deforms and the strain gauge expands and contracts. This changes the electrical resistance of the strip. This change is detected by a Wheatstone bridge or similar circuit. A bridge circuit measures the change in resistance and converts it into an electrical signal proportional to the applied load.

The generated electrical signal is passed on to a display or control system. In most cases, the signal is amplified and digitized to provide accurate weight measurements and automatic control.

There are different types of load cells optimized for different applications. For example, bending beam load cells are often used in industrial applications, while S-shaped load cells are used on small scales. However, regardless of their specific design, the basic functionality is similar.

Load cells are technological masterpieces in weight measurement. Strain gauges and bridge circuits enable accurate and reliable weight measurements in a wide variety of applications. In industrial processes, retail or everyday life, load cells play an important role in measuring the weight of objects. Their high accuracy and reliability make them indispensable instruments in modern measurement technology.

Main advantages of load cells:

• High precision: Load cells with strain gauges enable precise weight measurements. By using high-quality strain gauges and careful construction, these load cells can ensure high accuracy and repeatability of measurement results.
• Wide measuring range: Strain gauge load cells are available in various capacities and can therefore measure a wide range of weights. From small loads to large industrial applications, there are load cells that can meet the needs of different weight ranges.
• Compact design: Strain gauges enable a compact design of the load cell. By using thin films as strain gauges, load cells can be manufactured in various sizes and shapes, facilitating their integration into various applications.
• Robustness and durability: Load cells with strain gauges are generally robust and durable. They can withstand high loads and are resistant to mechanical wear and environmental influences such as vibrations, moisture and temperature fluctuations.
• Easy installation and maintenance: Installing load cells with strain gauges is usually straightforward. They can be easily integrated into existing systems. Additionally, they require minimal maintenance, resulting in a cost-effective solution.
• Versatility: Load cells with strain gauges are used in a variety of industries and areas. They are used in industry, commerce, medicine, agriculture and many other applications. Their versatility makes them a widely used solution for weight measurements.

Common types of load cells

There are different types of strain gauge load cells depending on the application and specific requirements. Here are some common types of load cells.

• Bending beam load cell: This is one of the most popular and versatile load cell types. It consists of a bending beam equipped with strain gauges. These load cells can provide high accuracy and precision, which is why they are used in a variety of applications such as industrial applications, packaging machines, level measurements and other weight measurements.
• S-shaped load cell: This type of load cell has a characteristic S-shape and is often used in small scales and platforms. High stability and easy assembly. S-shaped load cells are suitable for applications such as retail scales, laboratory scales and small industrial applications.
• Shear beam load cell: Shear beam load cells are used in applications where horizontal force measurement is required. They consist of a metal block with shear bars equipped with strain gauges. This type of load cell is usually compact and has good accuracy. They are often used in packaging machines, weighing and filling systems as well as in material testing.
• Pressure plate load cell: These load cells are specifically designed for measuring compressive forces. These consist of pressure-sensitive plates with strain gauges. Pressure plate load cells find application in areas such as building materials testing, materials testing and industrial presses.
• Double bending beam load cell: This type of load cell consists of two bending beams arranged in parallel. It has improved resilience and is suitable for applications where high loads need to be measured. Double beam load cells are used in industrial applications, storage systems and heavy duty scales.

It is important to note that these are just a few examples of strain gauge load cells. There are also other specialized types designed for specific applications. When selecting a load cell, it is important to consider application requirements, measurement range, accuracy and other factors to select the right load cell.