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.

Integrated measurement solutions improve design and increase functionality

In today's rapidly evolving innovation landscape, precision and accuracy are critical, especially when measuring force, torque and weight. This applies to all phases of integrating sensors into new product designs and retrofitting existing devices or components with measurement capabilities.

Interface, a pioneer in the development of load cells and integrated measurement devices, is at the forefront of this innovation and offers cutting-edge solutions for various applications.

Our integrated measurement solutions ensure the safety and reliability of machines, products and processes in various industries. We offer measurement devices for integration in industries such as aerospace, energy, medical and healthcare, automotive, manufacturing and industrial automation. Our sensor technologies integrate seamlessly into various products and machines, from lifting equipment to consumer goods. This adaptability ensures that our solutions can be tailored to your individual requirements.

Why choose measurement solutions with interface load cell technology?

Strain gauge load cell technology provides precise, real-time force or weight measurement data for various applications. The integration of these devices, such as our Mini load cells, transforms new products, existing machines and components into intelligent systems. Real-time data enables predictive maintenance, optimizes performance and increases safety. The load cell is not just a sensor, it is the catalyst for intelligent design and functionality.

Our tailor-made measurement solutions integrate seamlessly into various applications, driving innovation and ensuring reliability. Sensor integration offers numerous benefits when it comes to ensuring that a product or part functions as intended and is reliable and durable. These include performance improvements, increased safety, durability improvement, material and structural monitoring and quality assurance.

Integrated solutions from Interface

Standard, order-related and customer-specific

Interface understands that every project is unique. We offer a variety of load cells, including low-profile models and a variety of shear beam, bend beam, S-type and load button designs for integration programs. This customization ensures you get a measurement solution that precisely meets your needs and integration specifications.

Partnerships

Precision is the cornerstone of Interface's products, which is one of the main reasons we are preferred as an integration solution provider. We work with our customers during measurement product development through all phases and iterations to find the best solution for their needs. We build long-term integration relationships by ensuring the high quality, accuracy and reliability of our sensors. When their design requirements require an upgrade, we work together to develop the next version. We have decades-long partnerships with many of Interface's integration customers.

Adaptability to the environment

Every integration presents unique challenges. These measuring devices often operate in difficult conditions, such as extreme temperatures, underwater, high vibrations, or harsh environmental conditions. Interface designs its load cells to withstand these conditions without compromising accuracy. For example, many load cells have built-in temperature compensation and overload protection. Our load pins and load shackles are ideal for rugged integrated solutions, such as elevators, underwater equipment, maritime applications, and heavy machinery.

Cranes introduce integrated performance measurement system

Interface's integrated solutions are flexible and used across a wide range of industries. From integrating into hardware to test aircraft components to monitoring the accuracy of medical devices, Interface has a long history of developing sensors that are tailored to our customers' exact needs.

A great example of integrated solutions in practice is Interface's support in testing and monitoring a crane application. This heavy equipment manufacturer chose four Interface products to create an integrated solution for its industrial cranes. This fully integrated measurement system allowed the customer to obtain data from different forces and on different axes to test each part of the lifting mechanism. This data helps improve product quality and ensure user safety in operation, in different environments and worldwide. Products involved include:

Stainless steel load measuring bolt
Traction links
Load shackle
WTS Modular Telemetry System Wireless Handheld Display

In an era where precision is the key to innovation, Interface integrated measurement solutions provide unparalleled accuracy, reliability and efficiency. As industries evolve, so does the need for advanced systems that can accurately measure force, torque and weight. Here is a summary list of Interface products used for integrated measurement solutions.

Low and high capacity load cells
Column pressure load cells
Pure compression load cells
Miniature load cells
Column and rod end load cells
Load cell load buttons
S-type and beam load cells
Sealed load cells
Stainless steel load cells
Multi-axis sensors
Wireless and digital outputs
Torque transducer
Flange torque transducer
Hexagonal and square torque transducers
Load measuring pin
Washers

We help our customers achieve this by seamlessly integrating our sensor technologies into their products, machines, parts and process ecosystems. Benefits of partnering with Interface for integrated solutions:

Experience
Expanding your team
Competence in technical integration and OEM solutions
Building capacities and skills
Manufacturing at US headquarters
Reliable partner with a successful track record
Highly customized designs with a balance between cost and performance

Whether you're looking to upgrade a product or machine design with sensor capabilities, or incorporate a sensor into your latest invention, contact Interface's application engineers to discuss options for products and systems that can help.

Embedding Sensors in Products Webinar Recap shows many possibilities for optimizing and improving products and devices using sensor technologies. Find out about the advantages that can be found in our Whitepaper OEM Solutions: An active component becomes a sensor.