Load cells are precision force measurement devices that are designed to measure force or weight and convert it into an electrical signal that can be easily processed and displayed. Load cells are integral to weighing systems across various industries, as their accuracy, reliability, and ability to withstand harsh environments. This has made them indispensable in industries such as manufacturing, logistics, healthcare, and aerospace.
While sometimes written as “loadcells,” these devices are more frequently called load cells, but the terms weigh cell, load sensor, and load transducer are also used. Load cells can commonly be found in industrial scales, tension measurement in cables, material testing, and force monitoring systems. They come in many shapes and sizes, including compression, tension, shear beam, and torsion, each tailored to specific measurement requirements. Browse our selection of top-performing load cells here, or continue reading to learn more about load cell principles and applications.
Why Do We Use Load Cells?
Broadly speaking, load cells let you know the exact weight you are handling, which enhances worker and consumer safety across the board. Load cells can also help determine the center of gravity, which can be particularly helpful when dealing with large or irregular shaped loads. By leveraging modern force measurement technologies, this vital information can be collected remotely and in real-time, ensuring a safer working environment.
Load cells also provide accurate weight measurements for inventory management, quality control, and billing, ensuring efficient operations and fair pricing. In manufacturing, they help monitor product weight to meet specifications, reducing defects caused by over or underweight materials. Additionally, load cells are integral to automation and process control, ensuring precise measurement and reducing human error. They can also support regulatory compliance by ensuring adherence to legal weight limits and preventing overloading of equipment, helping businesses avoid accidents and reduce maintenance costs. These sensors contribute to a safer, more efficient, and cost-effective working environment.
Types of Load Cells
Load cells come in many different varieties, including:
- Strain Gauge Load Cells: Strain gauge load cells are arguably the most widely used type, offering high precision for applications where accuracy is vital. They function by detecting changes in electrical resistance as the material deforms under an applied force, capable of measuring both tension and compression forces.
- Compression Load Cells: Compression load cells are designed to measure forces that push or compress. Commonly used in industrial environments, these load cells are ideal for monitoring weight on conveyor belts or hydraulic presses.
- Tension Load Cells: Tension load cells are used to measure forces that pull apart or create tension. These load cells are frequently used in industries such as fishing and construction to measure tensile forces.
- Shear Beam Load Cell: Shear beam load cells are designed for medium to high-capacity applications, such as truck scales, tank weighing, and industrial automation. They provide reliable performance in environments that require high precision and durability.
- Bending Beam Load Cells: Bending beam load cells are valued for their versatility and durability. These load cells are commonly used in floor scales, pallet scales, and filling machines, making them ideal for a variety of general-purpose applications.
- Canister Load Cells: Canister load cells are built for high-capacity applications, typically used in silo and tank weighing systems. Their robust design ensures reliable measurement in demanding environments.
How Accurate Are Load Cells?
Load cells are widely recognised for their high precision in measuring force or weight. These measurement devices convert mechanical force into an electrical signal that can be analysed to determine the applied weight or force. The accuracy of load cells is often expressed as a percentage of the full-scale output, meaning that the measurement may deviate slightly from the true value across the entire range. As an example, a load cell with an accuracy of ±0.1% full-scale indicates that the measurement could vary by up to 0.1% from the true value.
The accuracy of load cells can vary depending on the type and application. Standard load cells typically offer accuracies ranging from ±0.03% to ±0.5% of the full-scale reading. High-precision load cells, designed for more demanding detailed applications, may offer even greater accuracy. This makes load cells ideal for industries where precise force or weight measurements are critical, such as manufacturing, research, and safety-sensitive operations.
Factors That Can Affect Load Cell Accuracy
There are various factors that can disrupt the accuracy of load cell measurements, such as:
- Linearity: Linearity refers to how closely the load cell’s output response matches a straight line across the range of applied loads. A highly linear load cell produces output readings that follow the expected proportional relationship between applied load and output signal, ensuring that the measurement is accurate throughout the entire range. Consistent linearity ensures more reliable results in applications where precise weight or force measurement is essential.
- Hysteresis: Hysteresis is the phenomenon where a physical property’s value lags behind changes in the influencing effect, such as when magnetic induction lags behind the magnetising force. Hysteresis occurs when the load cell’s output signal varies depending on whether the load is increasing or decreasing. The hysteresis error is defined as the maximum difference between the readings recorded during loading and unloading cycles. Minimising hysteresis is crucial for maintaining the accuracy and reliability of the load cell, particularly in processes involving frequent load variations.
- Repeatability: Repeatability, also known as precision or reproducibility, measures how consistently a load cell produces the same output when the same load is applied multiple times under identical conditions. High repeatability ensures that the load cell provides reliable and consistent results each time the load is applied, which is essential for industrial and research applications that require consistent performance.
- Environmental Conditions: Environmental factors such as temperature fluctuations, humidity, vibration, and electromagnetic interference can significantly impact the performance and accuracy of load cells. Load cells that are designed to operate in challenging environments often include compensation mechanisms or protective features like temperature compensation, sealing, or shielding to minimize the effects of these environmental factors on the accuracy of the measurement. This ensures the load cell performs consistently, even in harsh conditions.
Industries That Rely on Load Cell Technology
Here are just a few of the countless industries that rely on the accuracy of load cell technology:
- Weighing: Usually installed all types of scales as well as hoppers or reactors to control weight capacity, load cells play a critical and important part in industrial processes. Load cells enable precise monitoring and automation, ensuring materials and ingredients are accurately measured to meet production standards and minimise waste.
- Manufacturing: Load cells are extremely instrumental when it comes to product testing, especially when the product being tested is focused on weight, volume, and even durability. Load cell batching assists in batch weighing and ingredient control systems which means less time for manual control. Load cells are also used when weighing chemical products in batches for packaging.
- Agriculture: As most agricultural companies distribute their products in large batches or quantities, load cells are needed in the distribution, measurement and overall packing of agricultural products including animal feeds, seeds, and water. Thanks to the humble load cell, every client has the assurance that what they get is of the right quantity and weight.
- Automotive: Designed to optimise car safety, reliability, and durability, load cells (and other force monitoring systems) are crucial in testing out an automobile’s safety. Load cells are also used for car engine parts, valve calibration, and more. Numerous companies and brands rely on load cell testing when it comes to designing, developing and testing motor vehicles.
- Medical: Anyone who works in the medical industry knows that accuracy is king. As such, most medical research equipment will use load cells for procedural testing. Getting accurate data is the only way to provide the proper treatment that a patient needs. This is why the medical industry covers a huge field of applications and why the medical industry continues to rely on load cells to solve all their weighing and measurement needs.
What to Consider Before Choosing a Load Cell
There’s no real industry standard when it comes to selecting the right load call, which can sometimes make finding the right one for you tricky. With that in mind, we’ve outlined some key considerations that you might like to factor in the next time you’re shopping around for your next load cell….
- Determine the Load Capacity: The load capacity refers to the maximum weight the load cell can accurately measure. This includes both live weight (the object being measured) and dead weight (the weight of the load cell and fixtures). To ensure reliability and prevent overload, the combined weight should not exceed 80% of the load cell’s capacity. For systems with multiple load cells, divide the total weight by the number of load cells, ensuring each load cell’s share also remains within 80% of its rated capacity.
- Accuracy Requirements: Accuracy is vital for applications requiring precise measurements. The accuracy of a load cell depends on its design, materials, and manufacturing quality. Select a load cell that meets or exceeds the accuracy required for your application, particularly in industries like pharmaceuticals or aerospace, where even minor deviations can have significant consequences.
- Environment of Operation: Environmental factors can impact load cell performance. Conditions like dust, moisture, extreme temperatures, and vibration must be accounted for. We recommend choosing a load cell with a suitable IP rating and materials (e.g. stainless steel for corrosion resistance) to ensure durability and reliable performance in your specific environment.
- Assess Size & Shape Constraints: The load cell’s physical dimensions should align with the space available in your application. Ensure there is sufficient clearance for installation and operation without interference. For tight spaces, consider low-profile designs, and for unique configurations, select a load cell with a compatible shape and mounting style.
- Determine If Mounting is Required (and If So, What Type): Load cells can be mounted in various ways — base-mounted, suspended, or inline — depending on the application. Ensure the load cell is designed for the desired mounting configuration and that it includes compatible accessories, such as mounting kits or hardware.
- Check for Calibration & Maintenance Needs: To maintain accuracy and prolong the load cell’s lifespan, regular calibration and maintenance are strongly recommended. Consider the ease of calibration and the availability of maintenance support for the chosen load cell. Some models may offer features like built-in diagnostics to streamline these processes.
Choose A&D Weighing for Your Load Cell Requirements
A&D Weighing stocks a wide range of quality load cells, including:
LCM13 Shear Beams Stainless Steel
With its stainless steel body, the LCM13 shear beam provides excellent protection against water, moisture, and corrosion, meeting IP67 standards. Designed with a low-profile, lightweight, and compact structure, it allows for easy mounting and versatile use. It’s trade-approved by NMI Australia, ensuring compliance with industry regulations. Suitable for both tension and compression applications, this load cell is also ideal for multi-point weighing setups, offering durability and reliability. The LCM13 series is available in a range of capacities, from 100kg to 5000kg, making it adaptable to various weighing needs.
LC-4204 Aluminium Single Point Load Cell
Featuring a robust parallelogram-type construction, this load cell delivers a rated output of 1.5mV/V ±0.2%, ensuring precise and reliable performance. Designed to withstand a maximum safe overload of up to 200% of its rated capacity, the LC-4204 aluminium single point load cell is both durable and versatile, suitable for single and multi-point weighing applications. With a compensated temperature range of -10°C to +40°C, it maintains accuracy in varied environments. The load cell is moisture-proof for enhanced durability, with an input resistance of approximately 400 ohms and an output resistance of 350 ± 5 ohms. Backed by a one-year warranty, it offers dependable performance across demanding applications.
LC-1205 Tension / Compression Load Cell
The LC-1205 tension / compression load cell features a dual-guided cantilever and shear beam design, delivering a rated output of 2mV/V ±0.5% for accurate and dependable performance. Compact and lightweight, it is easy to handle and install, making it suitable for a variety of applications. Built to withstand a maximum safe overload of 200% of its rated capacity, it ensures durability under demanding conditions. With a compensated temperature range of -10°C to +60°C, it operates reliably across diverse environments. Moisture-proof construction enhances its longevity, while an input resistance of approximately 400 ohms and an output resistance of 350 ± 3.5 ohms ensure stable performance. Backed by a one-year warranty, it offers a reliable solution for precision weighing tasks.
LCC11 Weighbridge & Tank Cells
This compression load cell is constructed with hermetically sealed stainless steel, ensuring durability and resistance to harsh environments. It is trade-approved by NMI Australia and designed for advanced load applications, including tanks, hoppers, and truck scales. Built to handle a maximum safe overload of 200% of its rated capacity, the LCC11 weighbridge & tank cells operate reliably within a compensated temperature range of -20°C to +60°C. The load cell is dustproof and waterproof to IP67 standards, providing robust protection against environmental elements. Supplied with mild steel top and bottom mounting plates, it offers easy installation. With an input resistance of 800 ± 30 ohms, an output resistance of 2200 ± 10 ohms, and a 12-metre cable length, this load cell is a dependable choice for precision weighing.
Conclusion
Load cells provide accurate, reliable, and versatile force measurement, enhancing safety, efficiency, and precision across various applications. You can browse our load cells here, or browse our many other quality products & services. A&D instruments are trusted in factories, warehouses, and laboratories, and schools nationwide. We also take pride in designing and calibrating scales used in Australia Post stores around the country, ensuring precise measurements for the postal sector. Got a question? You can contact us here.