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.

Celebrating 57 years of a lasting legacy in force measurement

On June 14th of this year, Interface celebrates its 57th anniversary as the global leader in force measurement technology! Since our founding in 1968, Interface has been synonymous with accuracy, reliability, and innovation. We provide industries around the world with the critical data they need to build, test, and innovate.

Our journey began with a commitment to solving complex measurement problems, and that commitment has only grown stronger over the decades. Since those early days, Interface has been driven by a passion for precision, developing state-of-the-art load cells, torque transducers, and measuring instruments that continue to set the industry standard.

A 57-year heritage built on innovation and expertise

Interface's history is a testament to continuous innovation. We've continually pushed the boundaries of what's possible in force measurement by introducing groundbreaking technologies and refining our processes to achieve unparalleled performance. Our experienced team of force measurement experts, engineers, administrators, and technicians is at the heart of this success. They bring their in-depth knowledge and unwavering commitment to quality to every product we design and manufacture.

5 interesting facts about Interface

Everyday impact: Although often hidden from view, interface technology is embedded in countless everyday products and processes, from ensuring the safety of airplanes and cars to improving the efficiency of assembly lines to ensuring your favorite vending machine dispenses the right amount of fizz in every bottle.
The “gold standard” of load cells: Our proprietary 1600 Gold Standard Calibration Universal LowProfile load cells are recognized worldwide as the gold standard for durability and longevity in demanding applications. They often exceed the service life of competitors by a factor of 100 or more.
Beyond Earth: Mars rovers and more: Interface load cells have traveled far beyond Earth's atmosphere, helping develop and deploy space infrastructure and research robots where precision under extreme conditions is paramount.
Pioneers of the Mini Load Cell: Interface was one of the first companies to perfect and popularize miniature load cells, revolutionizing force measurement in close quarters and opening up new possibilities for product design and testing.
Leading manufacturer owned by women: Interface was founded in 1968 by Richard F. Caris in Scottsdale, Arizona, and is now owned by his daughters, who continue to play a central role in the company and make it the global leader in force measurement.

7 reasons why Interface remains the undisputed market leader

Unmatched accuracy and precision – Our commitment to the lowest possible error rates and highest resolution ensures that our customers receive the most accurate and reliable data for their critical applications.
Outstanding product reliability and durability – Designed and manufactured for durability, interface products are built to withstand the most demanding industrial and test environments, ensuring consistent performance for years to come.
Comprehensive product portfolio – We offer the industry’s largest selection of force measurement solutions, from Mini load cells to Low profiles with high capacity, multi-axis sensors, torque transducers and advanced measuring instruments.
Customization and application expertise – We excel in providing customized solutions that meet our customers' specific requirements and leverage our extensive application knowledge to solve even the most complex measurement tasks.
World-class customer support and technical service – Our dedicated team of experts provides unparalleled pre-sales advice and post-sales technical support to ensure optimal product selection and seamless integration.
Continuous innovation and R&D investment – Interface continuously invests in cutting-edge research and development, tools, groundbreaking new technologies, and pushes the boundaries of what is possible in force measurement.
Worldwide Trust and Recognition – Leading companies trust Interface and the quality of our products, which are used worldwide in aerospace, automotive, medical, and industrial markets. The company is recognized as the leading name in force measurement.

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Thank you for being part of our journey

As we celebrate 57 remarkable years, we would like to express our sincere gratitude to our loyal customers, dedicated employees, and invaluable partners. Their trust and cooperation have contributed significantly to our success and continued growth. The future of force measurement looks bright, and Interface is excited to continue leading the way. We look forward to more years of innovation, precision, and partnership.

Happy 57th anniversary, Interface! Here's to many more years of pushing the boundaries of what's possible in force measurement.

We celebrate 57 years of a lasting legacy in force measurement

A 57-year heritage built on innovation and expertise

5 interesting facts about Interface

7 reasons why Interface remains the undisputed market leader