What is the difference between a force transducer and a load cell?

Force transducers and load cells are based on the same measuring principle – the strain gauge – and convert mechanical forces into electrical signals. The term load cell is predominantly used in weighing and process engineering, while force transducers cover the broader spectrum of force and torque measurement technology: from test benches in the aerospace industry to materials testing. interfaceforce® eK distributes both types in measuring ranges from 0,5 Newtons to 30 Meganewtons.

What types of force transducers does interfaceforce® eK offer?

The portfolio includes low-profile force transducers, S-shaped force transducers, miniature force transducers, measuring bolts, force rings, bending beam load cells, cylindrical high-load sensors, and multi-component transducers for up to 6 degrees of freedom (6DoF). All standard models are strain gauge based and supplied with a calibration certificate. Custom designs are developed according to customer specifications.

Which torque transducers are suitable for rotating applications?

For rotating shafts, torque measuring shafts (e.g., T2, T4, T6, T8, T11, T22, T25) are available, which operate without contact and without slip rings. The measuring ranges extend up to 10 kN·m. For static or reactive applications – such as in test benches or for measuring bolt preload – reaction torque transducers are used. Both variants provide strain gauge-based signals and are compatible with the measuring amplifiers from interfaceforce® eK.

How does the XSENSOR pressure distribution system work and what is it used for?

XSENSOR systems measure surface pressure distribution using ultra-flexible sensor mats in various geometries and resolutions. These imaging systems deliver precise, reproducible results and are used in automotive and medical technology, biomechanics, and point-of-sale applications – for example, for seat pressure analysis, tire contact patch measurement, mattress diagnostics, and wiper testing. The XSENSOR laboratory is accredited according to ISO/IEC 17025 (A2LA).

What measurement accuracy do the force transducers from interfaceforce® eK achieve?

The low-profile force transducers of the Interface series (e.g., 1200, 1201, 3200) typically achieve a total static error band of ≤ 0,02% of the nominal value (full-scale output). The Gold Standard® and Platinum Standard® reference force transducers are suitable for calibration tasks according to ISO 376 Class 0,5. All sensors are supplied with a calibration certificate; A2LA-accredited certificates according to ISO/IEC 17025 are available upon request.

Does interfaceforce® eK also perform calibrations of third-party sensors?

Yes. The calibration laboratory of interfaceforce® eK is ISO/IEC 17025 accredited (A2LA and DAkkS mutually recognized within the framework of the ILAC MRA) and calibrates force measuring devices regardless of the manufacturer. Supported standards: ISO 376, DKD-R 3-3, ASTM E74, VDI/VDE 2624, and custom calibration procedures. Force measuring ranges: 0,5 N to 250 kN (tension and compression). An RMA number will be issued in advance for submissions; the delivery address for calibrations and repairs is c/o SETFLEX, Oppelner Str. 23, 41199 Mönchengladbach, Germany.

How does a calibration process work and how long does it take?

The process begins with an inquiry via contact form or email; interfaceforce® eK promptly issues an RMA number. Upon receipt of the device, calibration is performed in an ISO 17025-accredited laboratory using static tensile and/or compressive force measurements with traceable transfer standards (DAkkS, NIST, or PTB). Calibrations according to ISO 376 or DKD-R 3-3 include multiple load stages in various mounting positions. Turnaround times are short – precise details are available upon request. The completed calibration certificate is internationally recognized.

Which force transducers are suitable for use in ATEX or explosion-hazardous areas?

For hazardous areas (ATEX/IECEx), interfaceforce® eK offers force transducers from the 3400 series as well as hermetically sealed sensor variants made of stainless steel. These models are designed for harsh and potentially explosive environments and deliver reliable measurement results even under continuous operation. For specific hazardous area requirements (Zone 1, Zone 2, etc.), we recommend individual consultation, as suitability depends on the respective device category and the medium being used.

From what quantity are special solutions and customer-specific force transducers available?

Custom designs are available even for single units. interfaceforce® eK develops customer-specific force transducers, torque transducers, and multi-component sensors based on over 25 years of experience and in-house strain gauge manufacturing. Rapid engineering and rapid prototyping enable solutions to be implemented in short lead times – from concept to series production. Application areas range from niche markets with small production runs to OEM integrations in high-volume series.

What distinguishes interfaceforce® eK from other providers in force measurement technology?

interfaceforce® eK has been the exclusive distributor in Germany for Interface Inc. (founded in 1968, Scottsdale, USA) since 1999 – one of the world's leading manufacturers of precision strain gauge-based force transducers. The service portfolio combines American manufacturing quality with local support: an ISO 17025-accredited calibration laboratory in Germany (A2LA/DAkkS, ILAC MRA), manufacturer-independent calibrations and repairs, custom manufacturing starting from a single unit, and exclusive distribution of XSENSOR pressure distribution systems. Measuring ranges from 0,5 Newtons to 30 Meganewtons cover virtually every industrial force measurement application.

What output signal do the force transducers provide, and what measuring amplifier do I need?

Strain gauge-based force transducers deliver a bridge signal of typically 2 mV/V or 4 mV/V at rated load. Further processing requires a measuring amplifier that converts this signal into a usable format – e.g., 0–10 V, 4–20 mA, USB, IO-Link, or digital interfaces. interfaceforce® eK offers suitable measuring amplifiers as complete measurement chains: from simple digital displays (IFFDA93, IFFDA5) and 8-channel data acquisition systems (IFFBX8) to wireless telemetry systems (WTS). Sensors with a TEDS chip also enable automatic parameterization at the measuring amplifier.

What protection ratings (IP classes) are available for the force transducers?

Most standard models are designed for industrial use and achieve protection ratings of IP65 to IP67 (dustproof, protected against water jets and temporary immersion). Hermetically sealed versions made of stainless steel achieve IP68 and are suitable for underwater, cleaning, and outdoor applications under harsh conditions. Certified versions are available for use in potentially explosive atmospheres (ATEX/IECEx). The exact IP rating can be found in each product data sheet; interfaceforce® eK is available upon request to advise on application-specific selection.

How often should a force transducer be recalibrated?

There are no legally mandated intervals; however, ISO 9001, IATF 16949, and industry-standard quality assurance systems recommend annual verification. In practice, the interval depends on the intensity of use, environmental conditions, and the required measurement uncertainty. In safety-critical applications or after mechanical overload events, immediate recalibration is recommended. The interfaceforce laboratory performs manufacturer-independent recalibrations with short turnaround times – even for sensors from other manufacturers.

What is TEDS and what advantages does it offer?

TEDS (Transducer Electronic Data Sheet, IEEE 1451.4) is an electronic data storage device integrated into the sensor or connector that automatically transmits calibration data and sensor characteristics to the measuring amplifier. This eliminates manual input and parameterization errors when replacing sensors – the measurement setup is ready for operation via plug-and-play. The IFFDA93 handheld device and other measuring amplifiers from interfaceforce® eK support the TEDS standard and enable quick, error-free commissioning, even with frequent sensor replacements.

What are parasitic forces and how do they affect measurement?

Parasitic forces are unwanted shear forces, bending moments, or torsional loads that act on the sensor simultaneously with the actual measuring force and can distort the result. Even an angular deviation of 5° in the load application causes a systematic error. To minimize parasitic influences, interfaceforce® eK recommends using rod ends, pressure load buttons, and mounting plates – all available as accessories. The interfaceforce® eK team provides support for sensor selection and installation advice upon request.

What are the delivery times and can I order small quantities?

Standard models from Interface Inc. that are in stock are available for immediate delivery. Custom designs and customer-specific receivers are manufactured upon receipt of order; thanks to rapid prototyping, initial samples are often available within a few weeks. There is no minimum order quantity – orders are possible starting from a single unit. Inquiries and orders can be made via email (info@interfaceforce.de), telephone (+49 8022 271667), or the contact form on the website.

Correct installation of low-profile load cells ensures accurate tension measurements

The low-profile load cell models of the series 1000, 1100, 1200 and 3200 from Interface are designed for high-precision tensile measurement applications.

A proper one Installation is of utmost importance for achieving the most accurate and reliable results. Below you will find some tips for typical installation of this load cell series, as well as key insights and common applications for tension measurement with Interface's popular LowProfile load cells. You will also find our general technical information.

The foundation: A rigid and level mounting surface

The accuracy of your load cell begins with its foundation. Our low-profile load cells must be mounted on a flat, rigid surface that cannot withstand significant deformation under load. If the mounting surface bends or twists, this will result in unwanted forces and inaccuracies in your measurements.

We strongly recommend using an interface base or mounting plate specifically designed for your load cell model to ensure this critical stability. If using an interface base isn't possible for your setup, ensure the alternative surface provides the same rigidity and flatness.

Tip No. 1 – It all depends on the direction: The sensitivity of the axial force

These load cells are designed to measure forces directly perpendicular to their mounting surface, primarily axial force. It's important to understand that interface load cells respond to forces in the axis perpendicular to the mounting surface. The response of a load cell to a non-axial force is proportional to that force times the cosine of its angle with the load axis.

This means that any force applied at an angle to the intended pull direction will have a lesser impact on the measured value. To achieve the most accurate measurements, you should strive to align the applied pull force precisely along the centerline of the load cell. Minimizing off-center loading is critical to obtaining reliable data.

Tip #2 – Securely anchored: Mounting the load cell

Once you've found a suitable mounting surface, the next step is to securely mount the load cell. Position the load cell on the flat surface. Then, tighten the load cell with a wrench through one of the four strategically placed holes on the side of the base. This ensures the load cell is firmly connected to your mounting structure. Note that using the wrench only works when a base is installed on a load cell.

Tip #3 – Connecting the power: Installing the connecting rod bearing and lock nut

Let's focus on how the tensile force is transferred to the load cell. This typically involves installing a rod end and a lock nut:

Install the rod end. Carefully screw the rod end into the upper thread of the load cell. Ensure the thread is the correct depth for a secure connection and force transmission.
Secure the rod end with the lock nut. Once the rod end is at the desired depth, it must be secured. To do this, tighten the lock nut against the top of the load cell using a torque wrench. It is important that you use the correct torque for your specific load cell model. These values can be found in the manufacturer's documentation.

Important note for higher capacities: Locknut locking is different for load cells with capacities of 12.500 lbf or more. Avoid using a torque wrench on these higher-capacity models. Instead, tighten the threaded adapter to 110% to 140% of the load cell's capacity to preload the connection. Then, hand-tighten the locknut. This securely attaches the locknut and threaded adapter to the load cell, preventing damage.

Tip #4: Final connection: Attaching the fork head

Once the rod end is securely attached, the clevis is the final mechanical connection. Align the holes. Carefully align the clevis pin holes on both the clevis and the rod end. Once the holes are perfectly aligned, insert the clevis pin through the holes. Finally, secure the clevis pin with the included cotter pin. This prevents the pin from accidentally coming loose during operation.

If all mechanical components are correctly installed and secured, your system can safely apply a tensile force to the load cell.

You are currently viewing placeholder content from YouTube. To access the actual content, click the button below. Please note that data will be passed on to third parties.

More information

Unlock content Accept necessary service and unblock content

Common Applications for Interface LowProfile Tension Load Cells

These versatile load cells are used in various industries and testing scenarios where precise measurement of tensile force is critical. Here are some Application examples for tensile tests:

Materials testing: Determining the tensile strength of materials such as metals, plastics and textiles by pulling them apart until failure.
Cable and wire testing: This involves testing the breaking strength and performance characteristics of cables, wires and ropes under tension.
Suspension system testing: Measuring forces and loads in suspension components for automotive, aerospace, and other applications.
Weighing and dosing systems: Use of tensile load cells in suspended scales or systems in which materials are suspended and weighed.
Structural monitoring: To ensure safety and integrity, stress is assessed in structural elements such as bridges, buildings, and pipelines.
Force calibration: High-precision tensile load cells as reference standards for the calibration of other force measuring devices.
Robotics and automation: Measurement and control of tensile forces in robot arms, actuators and automatic assembly lines.
Aerospace testing: Evaluation of tensile loads on aircraft components, control surfaces and landing gear.

The most important insights for a successful tension installation

Flat and rigid mounting: This is the essential basis for accurate measurements.
Axial force alignment: Ensure that the tensile force acts directly along the axis of the load cell.
Secure installation: Tighten the load cell properly to the mounting structure.
Capacity-specific tightening torque: Follow correct locknut tightening procedures, especially the no-torque rule for higher capacities.
Sequential installation: Follow the steps described for the rod end bearing and the clevis mount.

Following proper installation procedures, including ensuring a flat and rigid mounting surface and using proper tightening methods (especially distinguishing between using a torque wrench for lower capacities and preloading and hand tightening for higher capacities), is essential for the accuracy, reliability, and longevity of your Interface Model 1000, 1100, 1200, and 3200 LowProfile load cells in tensile applications. Incorrect installation can result in inaccurate readings, sensor damage, and potentially unsafe operation.

Always consult the load cell model's full specifications and installation instructions for detailed specifications, accurate torque values (where applicable), critical safety precautions, and any specific requirements applicable to your application and model.

By knowing the correct installation techniques, you can unlock the full potential of your Interface LowProfile load cells and achieve accurate and reliable tensile force measurements in your specific application.

Please also note our technical information.