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.

What are IO-Link load cells?

Interface continues to see growing demand for the use of various communication protocols within our force sensors and gauges. One of these protocols is IO-Link, a standardized communication protocol that enables bidirectional communication between the control system and the connected devices. It is often used in the area of industrial automation and the IoT .

IO-Link is designed for connection and communication between sensors, actuators and other industrial devices with a higher-level control system. It runs over a standard three-wire connection, typically with unshielded industrial cables, and supports point-to-point communication.

Industrial automation and the Internet of Things (IoT) are fundamentally dependent on digital transformation. Industry 4.0 requires the exchange and communication of information between sensors and instruments. IO-Link supports this requirement and helps to keep machines and systems with sensors under control while improving their efficiency and productivity.

IO-Link can be used with load cells in industrial applications to provide improved monitoring, control and diagnostics. Interface now offers customization of our most popular load cells with IO-Link capabilities.

Why use IO-Link in testing and measurement technology?

IO-Link is compatible with a wide range of sensors, actuators and other devices. It offers a standardized interface that enables easy integration and interchangeability of devices within an automation system.
Real-time monitoring, control and diagnosis is particularly important in measurement technology. IO-Link enables this type of data exchange between devices and the control systems that support the transmission of measurement data.
IO-Link supports both analog and digital devices, making it suitable for a range of applications.
With IO-Link, devices can be connected via a single cable, reducing the complexity and cost of cabling and simplifying installation and maintenance.
Health and maintenance are important when testing. IO-Link provides advanced diagnostic features that allow devices to report their status, health and detailed diagnostic information. This is valuable for maintenance, troubleshooting and reducing downtime.

Interface 1200 and 1201 Load Cell IO-Link features and benefits

The 1200 and 1201 series IO-Link load cells are low-profile load cells that are compatible with IO-Link.

Proprietary interface temperature
Compensated strain gauges
Eccentric load compensated
Low deflection
Shunt calibration
tension and pressure
Compact size
Internal 3-wire amplifier, selectable between 4-20 mA, ±5V, ±10V, 0-5V, 0-10V
Options: Base (recommended), custom calibration, multiple bridge, special thread and double diaphragm
Accessories: mating connectors, mating cables, instrumentation and chargers

A complete datasheet for this product can be found on product page 1200 and 1201 with IO-Link.

IO-Link integration with load cells increases the functionality and flexibility of weight measurement systems by enabling seamless communication, remote evaluations and diagnostic options. It contributes to more efficient and reliable industrial processes that require precise monitoring.

Monitoring weight and force: By connecting load cells to an IO-Link capable system, such as a PLC or weighing controller, weight data can be transmitted and monitored in real time. The load cells measure the weight or force acting on them and this information can be immediately transmitted to the control system via IO-Link. The control system can then perform tasks such as weight-dependent control, process optimization, or triggering specific actions based on weight thresholds.

Remote parameterization and calibration: IO-Link enables remote parameterization and calibration of load cells via the control system. Instead of manually adjusting the load cell settings at the device level, the control system can send the necessary configuration commands via the IO-Link interface. This feature simplifies the setup process, saving time and reducing the risk of errors during calibration.

Performance Evaluation and Detection: IO-Link provides diagnostic capabilities for load cells and enables the detection of potential problems or anomalies. The load cells can send diagnostic information, such as temperature, supply voltage or error codes, to the control system via IO-Link. This data can be used for predictive maintenance, troubleshooting or alerting in the event of malfunctions.

IO-Link increases the functionality, flexibility and efficiency of industrial automation systems by enabling intelligent communication between devices and the control system.