About Load Cells & Force Transducers
Load Cell and Force Sensor
A load cell is a mechanical force transducer that produces a linear change in voltage proportional to the force applied. These devices are typically rated in weight units such as grams, pounds, newtons, kilograms, or tonnes. A load cell is capable of measuring weight from zero to its stated capacity. The accuracy of a load cell is generally expressed as a percentage of its overall capacity. For example, a 100kg load cell with an accuracy of ±0.03% will provide a worst-case accuracy of ±30 grams when measuring weights from zero to 100kg, regardless of whether the load is 5kg or 95kg.
In addition to the aforementioned specifications, a load cell data sheet provides other essential information such as its capacity, overload, accuracy, sensitivity, and thermal sensitivity. The capacity refers to the overall capacity of the load cell, while the overload specifies the maximum percentage of full load that the load cell can handle without sustaining damage. Accuracy may be expressed in terms of linearity, hysteresis, repeatability, and creep, with all figures expressed as a percentage of the overall capacity of the load cell. Sensitivity, which determines the actual voltage output when a full load is applied to the load cell, is expressed in mV/V. Finally, thermal sensitivity describes how the output of the load cell changes with temperature and is typically expressed as a percentage of full load/°C.
Load cells are widely used in various industries to measure weight accurately. These devices are made of metal blocks that undergo precise machining to create specific areas that undergo high strain when weight is applied to them. Strain gauges are then attached to these areas using high-strength adhesives. The most commonly used materials for load cell manufacturing are Aluminium, Steel Alloy, and Stainless steel, although other materials may be used depending on the specific application.
In mechanical assembly processes, load cells are used for force feedback and quality assurance. For example, load cells can be integrated into automated assembly systems to provide real-time feedback on the amount of force being applied during assembly. This information can then be used to adjust the assembly process to ensure that the correct amount of force is applied for each component. Load cells can also be used for quality assurance, ensuring that each component meets the required specifications before being released to the market.
There are several types of load cells that are commonly used in various industries. Here are some of the most common types:
Strain Gauge Load Cells: Strain gauge load cells use strain gauges to measure the deformation of the metal body when weight or force is applied. These load cells are widely used due to their accuracy, reliability, and affordability.
Hydraulic Load Cells: Hydraulic load cells use a hydraulic system to measure weight or force. These load cells are ideal for use in harsh and rugged environments due to their durability.
Pneumatic Load Cells: Pneumatic load cells use a pneumatic system to measure weight or force. These load cells are ideal for use in applications where high accuracy is not required.
Capacitive Load Cells: Capacitive load cells use a change in capacitance to measure weight or force. These load cells are highly sensitive and accurate, making them ideal for use in applications that require precise measurements.
Piezoelectric Load Cells: Piezoelectric load cells use a piezoelectric crystal to measure weight or force. These load cells are highly sensitive and accurate, making them ideal for use in applications that require precise measurements.
Magnetoresistive Load Cells: Magnetoresistive load cells use a change in resistance due to magnetic field changes to measure weight or force. These load cells are highly sensitive and accurate, making them ideal for use in applications that require precise measurements.
Vibrating Wire Load Cells: Vibrating wire load cells use a vibrating wire to measure weight or force. These load cells are highly sensitive and accurate, making them ideal for use in applications that require precise measurements.
Load Cell technology has undergone significant advancements over the years, and the strain gage load cell has emerged as the most popular choice for precision force measurement due to its unique technical advantages. Strain gage load cells are relatively simple to manufacture compared to other precision sensors, which makes them more cost-effective for industrial applications. Furthermore, the commercialization of strain gage load cells for several decades has resulted in economies of scale, which further reduces the cost of production.
Another significant advantage of strain gage load cells is that none of the strain gage technology is protected under patent. This means that there are no restrictions on the design and manufacture of strain gage load cells, and several countries worldwide produce high-quality strain gage load cells for various industrial applications. For instance, load cells made in countries such as the USA, Japan, China, Germany, and Switzerland are known for their superior quality and reliability.
As manufacturers' representatives for different sensor companies and load cells, we specialize in providing our clients with high-quality strain gage precision load cells from reputable manufacturers worldwide. Our focus on strain gage load cells reflects our commitment to offering our customers the most advanced and reliable load cell solutions available in the market. With our expertise and experience in the industry, we ensure that our clients get the best quality load cells that meet their specific application requirements.
2. Strain Gage Based Load Cells
2.1 Principle of Operation
A strain gauge-based load cell is a type of load cell that uses strain gauges to measure weight or force. Strain gauges are attached to the load cell body at specific points where the device is likely to undergo strain when weight or force is applied. When weight or force is applied to the load cell, it causes a deformation in the metal body, which in turn, causes a change in the resistance of the strain gauges. The change in resistance is then converted into an electrical signal, which is proportional to the weight or force being measured.
The use of strain gauges enables the load cell to detect even small changes in weight or force with high accuracy. Strain gauge-based load cells are commonly used in various industries for weighing and force measurement applications, including industrial automation, aerospace, automotive, and medical equipment. These load cells are highly durable and reliable, making them ideal for use in harsh and demanding environments. They are also highly precise, with accuracies ranging from ±0.1% to ±0.005% depending on the specific load cell and application.
The machining process of load cells requires high precision to ensure that the devices are capable of measuring weight with exceptional accuracy. After machining, the strain gauges are carefully attached to the designated areas using specialized adhesives. This process requires skill and expertise to ensure that the strain gauges are accurately positioned and securely attached to the load cell body.
Strain gauges themselves consist of thin foil elements that are glued to the load cell body. These cleverly designed strain gauges are capable of detecting even the smallest movements or stretching and converting these changes into comparatively large changes in resistance. This relationship between strain and resistance is almost perfectly linear, making it possible to achieve high accuracy in load cell measurements. In fact, load cells with accuracies ranging between ±0.01% and ±0.02% are not uncommon, especially in high-precision applications.
Aside from their exceptional accuracy, load cells offer other advantages, such as high sensitivity, excellent linearity, and low hysteresis. Additionally, load cells are highly durable and reliable, making them ideal for use in harsh and demanding environments. With advancements in technology, load cells have become more compact, more versatile, and more affordable, making them a popular choice for a wide range of applications.
2.2. Wheatstone Bridget Circuit
To convert the small change in resistance that occurs when weight is applied, the strain gauges are connected in a Wheatstone bridge configuration. Typically, there are four or a multiple of four strain gauges in a load cell.
Load cells usually have either four or six wires coming out of them. The two wires used to power the load cell are called "excitation" wires, while the two wires used to return a signal to the weight indicator are called "signal" wires. If the load cell has a six-wire connection, the extra two wires are called "sense" wires. These wires are used by the weight indicator to compensate for voltage drop in the excitation over long distances. The sense wires are connected to the same point as the excitation wires.
When the strain gauges within the load cell are connected in a balanced Wheatstone Bridge circuit and excited by an AC or DC voltage, the load cell produces an electrical output that is a direct linear function of the excitation voltage. Balancing the Wheatstone bridge circuit is essential to ensure accurate weight measurement. If the bridge is not balanced, the output signal may be affected by temperature changes or other environmental factors, leading to inaccurate readings.
Load cells typically have an excitation voltage of between 3 and 15 Volts DC. The signal output of the load cell depends on the load cell itself, but it usually falls in the range of 0 to 50 mV. The signal output of the load cells is expressed in milli-Volts per Volt (mV/V). The load cell's sensitivity refers to the number of milli-Volts of signal output that the load cell produces for each Volt of excitation applied. Typical sensitivity ranges for load cells are from 1mV/V to 3 mV/V, although some load cells may have sensitivities outside of this range depending on their specific application.
3. Types of Load Cells
3.1 Pancake Style
Compression "pancake" load cells are often used in mechanical assembly applications, especially in presses, to ensure accurate force feedback and quality assurance. The low-profile design of the load cell allows it to fit easily into the press, without taking up too much space. In addition, the pancake load cell's sensitivity to small changes in weight allows it to accurately measure the force applied by the press, making it an ideal solution for monitoring the press's output.
Compression pancake load cells are a highly effective solution for measuring force in a range of applications, such as pressing and weighing. Their low profile design makes them less susceptible to side loading or applying torque to the load cell, which can damage them. This ensures that the load cells remain safe and secure, providing accurate measurements without any risk of damage.
The sealed foil gage sensor inside the transducer converts the deflection caused by the applied force into an electrical signal that is proportional to the change in load. This makes compression pancake load cells reliable and accurate for measuring the force applied by the press, even in the presence of unwanted side loads.
At A-Tech, we offer a range of compression pancake load cells in various capacities, making it easy to find the right load cell for your specific needs. Their easy integration into the press system with minimal hardware ensures that installation and maintenance are simple and efficient. Compression pancake load cells are a reliable and accurate solution for force feedback and quality assurance in mechanical assembly applications, especially in presses.
To ensure the accuracy and longevity of compression pancake load cells, it is important to protect them from side loading and other environmental factors. This can be done by ensuring that the load is applied directly over the load cell's central axis. Additionally, load cells can be coated with protective materials that shield them from moisture and temperature fluctuations. By taking these precautions during the manufacturing process, compression pancake load cells can provide reliable and accurate measurements for many years of service.
A-Tech is committed to offering only the best load cells from leading manufacturers in Germany, the United States, France, Slovakia, and Japan. With our range of compression pancake load cells, you can trust that you are receiving high-quality products that are reliable, accurate, and efficient for your specific application needs.
Product Selector for Pancake Load Cells
3.1.2 Application - Press Force Measurements
In addition to their compact size and high accuracy, pancake load cells are also known for their high stiffness and low deflection, which means they can handle high loads without bending or distorting. They are typically made of high-grade materials such as stainless steel, which makes them resistant to corrosion, wear, and damage from shock and vibration. Pancake load cells also have a wide measurement range, which allows them to measure forces from a few pounds to several hundred tons.
They can be equipped with digital or analog output, making them compatible with a variety of measurement systems and data acquisition devices. Furthermore, pancake load cells can be customized to fit specific press designs and requirements, ensuring optimal performance and accuracy. All these technical factors make pancake load cells an ideal choice for measuring force on different types of presses, from small benchtop models to large industrial machines.
Learn More about Press Force Monitoring Systems
Presses are commonly used in manufacturing operations to perform a variety of processes, including clinching, riveting, crimping, press-fitting, and more. Clinching, for example, is a process where two metal sheets are joined together by forming a mechanical interlock without using heat or additional materials. Riveting involves joining two or more metal components by driving a metal pin through them.
Crimping is the process of forming a tight and secure seal between two components by deforming a metal or plastic ring or sleeve around them. Press-fitting involves inserting one component into another by using a press to apply force. These processes require precise force and control, which can be achieved with the help of load cells. By measuring the force applied during these operations, manufacturers can ensure consistent quality and avoid defects in their products. Load cells are an essential tool in press applications, enabling manufacturers to monitor and optimize their processes for maximum efficiency and quality.
3.1.3 Application - Silo or Hopper Weighing
For Silo or Hopper Weighting Applications, A-Tech offers the all stainless steel R10X with SILOKIT-R. The SILOKIT-R stabilizes the load cell, and ensures that the load is being applied perpendicular to the measurement surface. In addition, the R10X is sealed to a very high integrity (IP 68) which makes them extremely suitable for measuring bulk material in the sanitary and clean-in-place environments.
Learn More about the SCAIME R10X
The SCAIME SILOSAFE kit is designed for tank and hopper weighing applications. It tolerates side shifting of the loading point, due to structure expansion for instance. It also includes heaving duty stoppers in all directions.
Below is how you the SILOKIT's can be oriented, either for 3 or 4 legged vessels.
3.1.4 Application - Overload Protection
The Burster 8524 load cell comes with an optional overload protection guards the load cell against damage under a static load that exceeds the safe load (150% of the rated load). The overload protection is available up to the measurement range of d 20 kN. Protection is achieved via a mechanical stop, which limits the measurement displacement of the sensor (to about 80 μm).
The overload protection contains additional holes for mounting on a fixed system structure, which then allows the transmission and measurement of tensile loads as well.
- Overload protection for compression only
- Measuring tension and compression load
- Overload protection mounting by factory only
- Tolerance of standardized output with overload protection at 0.5 % F.S.
- Do not use the overload protection often
- Overload protection does not have any centric threaded hole
3.1.5 Application - Pull Plates
To expand the range of potential applications for tension and compression load cells to include measuring tensile loads in moving assemblies, a pull plate can be used. In this example, the Burster 8524 has pull plates attached to the sensor's flange by its outer flange and features a central threaded hole that can accommodate customized threaded parts or rod end bearings.
Once the pull plates are fitted, they become an integral part of the sensor and are calibrated as a unit. As a result, the sensor and plate are only supplied as a pre-assembled combination. To attach the pull plates, bolts of strength 12.9 are required. This ensures a secure and durable connection that can withstand the stresses of measuring tensile loads in moving assemblies.
3.1.6 Application - Ball Joints
A load button with ball joint accessory is a device used to measure the compressive force on a surface. It consists of a pancake load cell, a load button, and a ball joint accessory. The pancake load cell measures the amount of force applied to the load button, while the ball joint accessory provides a flexible connection between the load cell and the load button.
The purpose of using a load button with ball joint accessory with pancake load cells is to eliminate lateral or side loads and compensate for slight inconsistencies in the tooling. The load button has a rounded surface that allows it to self-align with the surface being measured. This means that even if the load is applied at a slight angle, the load button will adjust to ensure that the force is applied perpendicular to the surface. This is important because lateral or side loads can cause inaccurate readings and affect the overall measurement accuracy.
The ball joint accessory provides additional flexibility and compensates for slight inconsistencies in the tooling. Tooling can have slight imperfections that can affect the accuracy of the measurement. The ball joint accessory compensates for these imperfections by allowing the load button to move slightly to accommodate any deviations in the surface being measured.
Overall, the load button with ball joint accessory and pancake load cells is a precise and accurate tool used for measuring compressive forces on surfaces. Its design eliminates lateral or side loads and compensates for slight inconsistencies in the tooling, ensuring accurate and reliable measurements.
3.2 Bending Beam Load Cells
Bending beam load cells are widely used in industrial manufacturing and packaging for applications that require precision weighing. These load cells consist of a cantilever beam that is fixed at one end and deflects under the weight of the object being weighed. Their design makes it easy to mount the load cell in different orientations and is also cost-effective to manufacture. Many models provide high accuracy, with a precision of 0.03% of full scale or better.
Rubber bellows are an essential component of bending beam load cells, used to seal the load cell and protect it from external contaminants. These bellows are flexible, allowing for small deflections while maintaining a sealed environment. This helps to prevent contamination and protects the load cell against environmental factors such as moisture and dust.
However, to avoid measurement errors and damage to the load cell from torsion moments, off-center loads, and transverse or lateral forces, loads should be introduced as closely as possible in the direction of measurement. Stay rods or guide rolls can be used to prevent these influences. It is crucial to handle the load cell and thin-walled bellows with care and avoid overloading them, particularly when dealing with load cells with small rated capacities.
When it comes to protecting bending beam load cells, there are several important considerations:
- Handle the load cell and its thin-walled bellows with care to avoid damage.
- Do not overload the load cell, even for short periods of time. This is especially important when dealing with load cells that have small rated capacities, as their permissible limit values can be reached quickly.
- Ensure that the load cell seating is horizontal, flat over the entire surface, and clean (just like the load cell base).
- Always load the load cell in the specified direction (as indicated on the data sheet). Never load in the opposite direction.
- Tighten the load cells firmly at the mounting bores, in a manner similar to a cantilever beam. The recommended tightening torques can be found on the data sheet, which the designer should refer to for additional dimensions, performance specifications, and other important information
There are various types of simple hardware that can be added to a standard bending beam load cell in order to integrate it into an application more effectively. Here are some examples:
- Swivel foot: This hardware is specifically designed for manufacturing platform scales.
- Roll and ball joint tension mounting kit: This kit is ideal for suspended hoppers weighing and mechanical weighbridge modernization.
- Compression mounting kit with elastomer: This kit is designed for small tanks or hoppers weighing with an agitator, and includes an elastomer for misalignment compensation, vibration damping, and shock absorption.
- Compression mounting kit with built-in side stoppers and ball and cup decoupling: This hardware is intended for tanks or hoppers weighing, and includes built-in side stoppers to prevent lift-off and high-precision ball and cup decoupling for added accuracy.
3.3 Shear Beam Load Cells
Shear beam load cells are well-suited for medium to high capacity weighing applications. These load cells are fixed to a structure on one end and a single point applies force on the other end. As a result, the beam bends and places the strain gauge area under shear. Shear is an effective measuring principle that provides resistance against side loads and has a small sensitivity to changes in loading position. The shear stress along the beam centre line is independent of the point of load application.
Typically, these load cells are used with special swivel feet and are mounted in the corners of large platform scales. They are also commonly used for vessel weighing. Shear beam load cells have several advantages over bending beam load cells, including better independence with respect to the point of load application, greater resistance to side forces, and better overload capability. However, mechanical stops are more challenging to adjust due to limited deflection at full scale. Shear beam load cells are typically used for weighing capacities ranging from 300kg to 5,000kg.
3.3.2 Application - Industrial Scale
To ensure accurate measurements and prevent damage to the load cell, it is recommended to introduce loads as close as possible to the direction of measurement. Any off-center loads, torsion moments, or transverse/lateral forces can result in measurement errors and potential damage to the load cell. To avoid these adverse effects, stay rods or guide rolls can be used, but they must not absorb any load or force components in the direction of measurement, as this could lead to force shunting and further measurement errors.
To minimize the impact of load introduction and environmental factors while also providing accurate and repeatable measurements and prolonging the life of the load cell, various load-introduction accessories are available for different mounting situations. These include a swivel foot for platform scales manufacturing, a compression mounting kit with elastomer for misalignment compensation and vibration or shock absorption, designed for tanks or hoppers with agitators, and a compression mounting kit with built-in side stoppers, liftoff prevention, and high precision ball and cup de-coupling, designed for tanks or hoppers weighing.
3.4 S-Type Load Cells
The S-type load cell, a widely employed sensor in tension applications, can also be utilized for compression measurements. This versatile device operates based on bending or shear strain as its primary measurement principle. To achieve accurate measurements, the S-type load cell must be configured such that the applied force passes perpendicularly through its center. This alignment is typically facilitated by incorporating clevis pins or rod-end bearings into the load cell assembly, which accommodate expansion forces and mitigate misalignments.
S-type load cells find applications in various fields such as vessel weighing, tensile testing equipment, torque restraint systems, and more. The capacity range for these sensors typically spans from approximately 25 kg up to 5,000 kg. Key technical features of S-type load cells may include strain gauge technology, high accuracy levels, temperature compensation, and robust construction with materials like stainless steel or alloy steel for durability in harsh environments. Additionally, their design often allows for overload protection and resistance to side loads, ensuring reliable performance under diverse operating conditions.
The S-type load cell is designed with threaded boreholes at both the top and bottom ends to facilitate effective load introduction. For optimal performance and accurate measurements, it is essential to introduce the loads as closely aligned as possible with the measurement direction. This helps avoid torsion and bending moments, which can cause measurement errors and potential damage to the load cell. To prevent these unwanted effects, it is important to use construction elements that do not absorb any load in the direction of measurement.
A-Tech can provide knuckle eyes as an effective solution to minimize adverse impacts associated with load introduction. When employing knuckle eyes, it is vital to fasten the nuts at the maximum load capacity, ensuring proper load introduction. Moreover, care should be taken not to introduce the fastening torque through the load cell itself, as doing so could compromise the accuracy of the measurements.
When using tension cells for vessel weighing applications, consider the following recommendations:
- Distribute the load cells evenly around the tank to guarantee each supports an equal share of the weight, promoting balanced and accurate weight distribution.
- Position the upper and lower rod ends at a 90-degree angle relative to each other, effectively reducing any swaying motion that may affect the readings.
- Install a safety rod next to each weigh module as an added precaution to enhance stability and safety.
- Ensure that the load cell is suspended vertically, as this orientation is crucial for achieving optimal performance.
- If the suspended vessel is prone to horizontal movement, it is advisable to install check rods that will limit this motion and protect the load cell from experiencing undue stress.
The key factor in achieving precise and reliable measurements with S-type load cells is the axial application of force. By following these best practices and maintaining proper alignment, users can ensure the load cell's accuracy and durability over time.
3.5 Rod or Column Type Load Cells
Rod Type load cells, also knows as Column type load cell, though conceptually straightforward, possess specific characteristics that make their design and production quite challenging. The column element must be sufficiently long relative to its cross-section to ensure a uniform strain field. As they deform under load, column load cells inherently exhibit non-linearity.
To compensate for this non-linearity, semiconductor strain gauges are employed. Compression-type column load cells avoid the momentum issues typically associated with beam-style load cells, leading to superior ultimate overload capabilities. However, due to their relatively small deflection, these load cells are more susceptible to shock loading.
Column load cells offer high accuracy, making them the preferred choice for applications such as truck scales and vessel weighing, where precise measurements are critical. Commonly used for capacities ranging from approximately 5 to 200 tons, these load cells can be found in various applications, including:
- Pressing for Assembly and Manufacturing
- Truck scales and weighbridges
- Vessel and silo weighing systems
- Industrial process weighing
- Hopper and tank weighing
- Offshore platform weighing
- Force measurement in material testing equipment
- Heavy-duty press monitoring and control
- Structural load monitoring in civil engineering projects
- Aircraft and aerospace component testing
- Crane and hoist load monitoring systems
Column load cells deliver reliable, accurate performance in a wide array of industrial, commercial, and research applications. By understanding and addressing the challenges posed by their inherent non-linearity and sensitivity to shock loading, engineers and technicians can leverage the strengths of column load cells to meet the demands of various high-capacity, precision measurement tasks.
3.6 Piezo Type Load Cells
Piezoelectric load cells, specifically designed for dynamic force applications, offer exceptional capabilities compared to traditional load cells used in static applications. When it comes to measuring dynamic oscillating forces, high-speed compression/tension, and varying conditions, piezoelectric load cells with specialized features are recommended. This article provides an in-depth overview of piezoelectric load cells, shedding light on their design, operating characteristics, and their role in enhancing dynamic measurements.
To comprehend the functionality of piezoelectric load cells and maximize dynamic measurements, it is crucial to understand their design and operating characteristics. Figure 1 illustrates the cross-section of a typical piezoelectric load cell, exemplified by the General Purpose 208 Series compression/tension model with built-in electronics.
When an external force is applied to the load cell, the embedded quartz crystals generate an electrostatic charge that is directly proportional to the input force. This charge output is collected by the electrodes situated between the crystals. It can be routed either to an external charge amplifier or converted within the load cell into a low impedance voltage signal. The following sections will explore these two modes of operation in detail.
3.6.1 Charge Mode Piezo Sensors
In the charge mode operation, piezoelectric load cells produce a high impedance electrostatic charge when subjected to stress. To ensure accurate measurements, this charge needs to be transmitted through a specialized "low noise" cable to an impedance converting amplifier, such as a laboratory charge amplifier or source follower, for recording purposes. While direct connection to an oscilloscope is suitable for high-frequency impact indication, it may not be ideal for precise force measurements.
The primary role of a charge or voltage amplifier is to convert the high impedance charge output into a usable low impedance voltage signal, facilitating accurate recording. Laboratory charge amplifiers offer additional flexibility for signal normalization, ranging, and filtering. Dytran's "electrostatic" charge amplifiers include input adjustments for quasi-static measurements, static calibration, and drift-free dynamic operation. On the other hand, miniature in-line amplifiers typically have fixed ranges and frequencies.
Moreover, piezoelectric load cells with insulated quartz crystals can be utilized at operating temperatures of up to 400°F (204°C), providing versatility in various environments.
Maintaining Signal Integrity
When employing charge mode systems, it is crucial to ensure the preservation of signal integrity throughout the measurement process. The output from the load cell's crystals is a pure electrostatic charge, and both the internal components of the load cell and the external electrical connectors maintain high insulation resistance (typically 10^3 ohm) to prevent leakage. Therefore, connectors, cables, and amplifiers used in conjunction with piezoelectric load cells must also possess high insulation resistance to maintain signal integrity. Environmental factors such as moisture, dirt, oil, or grease can compromise insulation, leading to signal drift and inconsistent results.
To mitigate triboelectric noise, which occurs when standard two-wire or coaxial cables generate an electrostatic charge between the conductors, it is crucial to employ special "low noise" cables. These cables are designed with a graphite lubricant between the dielectric shield, effectively minimizing the triboelectric effect.
3.6.2 IEPE or Voltage Mode Load Cell
IEPE (Integrated Electronics Piezo Electric) piezo force sensors are advanced devices specifically designed to enhance dynamic force measurements. With integrated electronics, these sensors offer exceptional capabilities and versatility in a wide range of applications. In this section, we will explore the unique features and benefits of IEPE piezo force sensors, shedding light on their construction, operating principles, and advantages for dynamic force measurement.
IEPE piezo force sensors are built with an integrated microelectronic amplifier, which sets them apart from traditional piezoelectric load cells. The integration of electronics within the sensor enables direct voltage output, eliminating the need for external charge amplifiers or specialized cables. This simplifies the measurement setup and enhances signal integrity.
The operating principle of IEPE piezo force sensors is similar to other piezoelectric devices. When subjected to an applied force, the embedded piezoelectric material generates an electrical charge proportional to the force. However, in IEPE sensors, this charge is converted into a low impedance voltage signal within the sensor itself, thanks to the integrated amplifier. This voltage output can be directly measured using standard data acquisition systems or other compatible devices.
Advantages of IEPE Piezo Force Sensors:
Simplified Setup: The integration of electronics within IEPE sensors eliminates the need for external charge amplifiers, resulting in a simpler and more streamlined measurement setup. This reduces the overall complexity of the system and minimizes the number of components required.
Improved Signal Integrity: By converting the piezoelectric charge into a low impedance voltage signal within the sensor, IEPE sensors provide improved signal integrity. This eliminates the susceptibility to noise and interference often associated with long cables and external amplifiers, ensuring accurate and reliable force measurements.
Wide Frequency Range: IEPE piezo force sensors are designed to operate across a wide frequency range, making them suitable for measuring dynamic forces with varying frequencies. Whether it's high-frequency vibrations or low-frequency impacts, these sensors can capture the force accurately and consistently.
Compatibility with Standard Data Acquisition Systems: IEPE sensors generate a voltage output that is compatible with standard data acquisition systems, making them easy to integrate into existing measurement setups. This compatibility allows for seamless data acquisition, analysis, and interpretation, saving time and effort.
Compact and Durable Design: IEPE piezo force sensors are often compact in size, allowing for easy installation in tight spaces or on small structures. They are also built to withstand harsh environmental conditions, ensuring durability and reliability in demanding applications.
IEPE piezo force sensors offer significant advantages in dynamic force measurement. Their integrated electronics simplify the measurement setup, improve signal integrity, and ensure compatibility with standard data acquisition systems. With a wide frequency range, compact design, and durability, these sensors are ideal for various applications that require accurate and reliable dynamic force measurements. By leveraging the benefits of IEPE technology, engineers and researchers can enhance their understanding of dynamic forces and optimize their processes accordingly.