Interface Mini Complete Systems optimize test and measurement technology
Interface offers a wide range of miniature sensors, primarily classified by measurement capacity and dimensions. For decades, Interface has supplied these compact measuring devices to testing laboratories worldwide, for use in a wide variety of industries, for integration into machines, as components of larger testing systems, and for continuous measurement on devices and end products.
Interface miniature sensors include S-type load cells, miniature bending beam (MB) load cells, force disc and force button load cells, ball joint load cells, and other special models such as brake pedal load cells and platform scale load cells.
TIP: Use the Mini™ Load Cell Types and Options Guide to get an overview of Interface's entire miniature sensor product family.
Define requirements for complete miniature sensor systems
Integrating miniature sensors for measuring force, torque, or weight into test equipment and products with severely limited installation space presents engineers with particular technical challenges. In addition to selecting the correct sensor capacitance and size, electrical specifications must be coordinated, cable resistance taken into account, signal conditioning configured, and overall system calibration planned.
Purchasing individual components – a sensor from one supplier, an amplifier from another, and generic cabling – often leads to integration delays, scaling issues, and time-consuming troubleshooting. Interface Complete Systems solve this problem by delivering factory-matched, pre-wired, and system-calibrated packages that can be installed and put into operation immediately.
Here are some examples of Interface Mini Complete Systems :
- SSM or SSM2 sealed S-type load cell and ILM in-line IO-Link amplifier, IO-Link compatible system
- SSB sealed bending beam load cell and 1280 programmable weight display and control system
- SMA miniature S-type load cell and 9825 universal display system
- LBM compression force button load cell and SGA AC/DC-operated signal conditioner system
- MB miniature bending beam load cell and 9825 universal display system
- SSMF fatigue-resistant S-type load cell and DMA2 DIN rail signal conditioner system
- LW Universal Force Disc Load Cell and WTS Wireless Telemetry System
- SPI Low Capacity Platform Scale Load Cell and 1280 Programmable Display and Control Weighing System
- BPL pedal force sensor and BTS Bluetooth telemetry system
The technical purpose of system-wide calibration in Mini Complete Systems
In an Interface Complete System , the sensor, connecting cables, and instrumentation (such as a digital display, a DIN rail signal conditioner, a USB digitizer, or a wireless telemetry module) are calibrated together at the factory as a closed measurement circuit. The resulting calibration certificate documents the verified performance of the entire hardware chain.
Calibrating a sensor independently of its instrumentation introduces hardware and electrical variables that can affect measurement accuracy in both laboratory and machine settings. Here are three common challenges to consider:
- Deviations in signal processing: Shunt calibration or theoretical calculations can reveal nonlinearities in the Analog-Digital-Conversion, drift of the excitation voltage or fluctuations in the input impedance in the amplifier are not fully taken into account.
- Cable interference: In millivolt-per-volt (mV/V) strain gauge circuits, the lead resistance directly affects sensitivity and temperature behavior. When a sensor is used with the type intended for the respective application, the resistance of the conductors directly affects the sensitivity and temperature response. Cables and the appropriate connectors Calibrated, the final system documentation takes the line resistance into account.
- Scaling and setup errors: Manual entry of calibration constants, Zero point adjustment and end values in digital displays, PLCs or DAQ modules poses a potential for errors during configuration.
IMPORTANT! Interface engineers and load cell experts strongly recommend selecting the optional system-wide calibration when combining an Interface sensor with an instrument to ensure that all components work together and eliminate these potential sources of error.
Configurable combinations of sensors and instrumentation
Interface Complete Systems provide basic configurations and examples of common assemblies. Interface configures our miniature sensor types with compatible instrumentation to meet the dimensions, capacity requirements, and communication protocols specified by your particular application.
The choice of miniature sensor depends on the force vector and the available installation space. For inline tensile and compression testing, compact S-beam models such as the SMA , the sealed SSM2 , and the fatigue-resistant SSMF offer high output signals and long service life in cyclic test benches or continuous machine monitoring. For compression-only applications with strict height restrictions , LBM force button load cells and LW force discs fit directly under fasteners, support structures, and machine tools.
When force measurement in the lower capacity range is required in medical devices, robot grippers, or automated assembly stations, the MB miniature bending beam force transducer and the REC rod end mini offer the necessary sensitivity. For rotating joints, small drive shafts, or fastener testing equipment, the MRT miniature flange reaction torque transducers detect rotational forces within compact assemblies.
Learn more about Interface's miniature load cell products in this introductory video: Interface | Miniature Load Cells 101
The instrumentation is selected to match the data destination – whether for display to a local operator, for connection to a PC workstation, or to an automated control network. Desktop and panel displays such as the 9825 Universal Display and the 9325 Portable Sensor Display provide on-site visual indications, tare functions, and limit relays for process alarms . For direct integration into plant PLCs and industrial controllers, DIN rail and inline signal conditioners such as the SGA , DMA2 , and ILM IO-Link modules convert low-level strain gauge signals into standardized 0-10 V, 4-20 mA, or digital bus signals.
If computer-aided testing is preferred, DIG-USB digital modules convert signals directly into technical units via USB without an external power supply. WTS wireless telemetry transmitters, in turn, reduce the amount of cabling required on moving machine rails and rotating devices.
Suitable accessories, cabling and hardware integration
A reliable measurement system comprises more than just the sensor and the instrument. Signal integrity and mechanical durability in industrial automation and test laboratory environments depend significantly on proper cable shielding, correct connector pin assignment, and mechanically robust mounting interfaces.
Interface Complete Systems include factory-terminated, shielded, low-noise cables precisely cut to the application length, eliminating the need for on-site wiring or field soldering. Connections feature industrial circular connectors, quick-release couplings, or hermetic feedthroughs, all pre-wired to factory standards. For further details, please refer to our Sensor Interconnect Cable Guide.
To ensure correct force application and prevent off-axis forces or bending moments from causing measurement errors, the systems are combined with suitable mechanical devices. These include alignment force knobs, thread adapters, mounting plates, and ball joints that are precisely matched to the thread pitch and force line of the miniature sensor – for straightforward integration, whether in a test bench or directly in a production machine.
Five operational and time-saving advantages of Mini Complete Systems
Standardization to pre-configured, factory-calibrated miniature systems leads to measurably lower integration effort and lower operating costs in both testing and manufacturing programs:
- Reduced engineering and assembly effort: This eliminates the hours that are usually spent on wiring connectors, configuring DIP switches, scaling displays, and manual or hydraulic calibration with test weights.
- Simplified procurement and setup For engineers and mechanical engineers who integrate force monitoring into their systems. A pre-calibrated testing and measuring system simplifies mechanical engineering as well as OEM procurement and bills of materials, eliminates the need to coordinate multiple suppliers, and standardizes assembly processes.
- Quality and expertise from a single source eliminate the unknown technical challenges that arise when sensor, cable and instrument suppliers need to be combined to diagnose signal noise or communication deviations.
- Immediate commissioning Thanks to its immediate readiness for use: Technicians can mount the sensor, connect the pre-labeled cable, power the device and immediately begin precise data acquisition.
- Traceable recalibration and system maintenance are crucial in testing and measurement technology. When routine quality audits or maintenance plans require recalibration, the entire hardware chain is returned together, serviced, and recertified – this ensures complete traceability and reduces administrative effort.
Tailor-made system configurations for miniature applications
The complete system packages comprise combinations of measurement hardware tailored to common installation space and data acquisition requirements across various industries. Because operating parameters vary significantly in aerospace testing laboratories, automotive assembly lines, medical device manufacturing, and industrial machinery, each component can be adapted to the specific requirements of your test plan or integration project.
Interface's application engineers work directly with you to define the parameters and requirements of your complete miniature force transducer or torque sensor system – including the exact cable, sensor, instrumentation and accessories needed for a verified, operational and calibrated measurement system.