8431, 8432Precision miniature tension/compression load cells

Compact and highly accurate! Ideal for precise tension and compression force measurements thanks to its small dimensions and minimal cross sensitivity. Insensitive to interference and with simple load application thanks to opposing threaded connections. Many options that are otherwise only offered in much larger sensors are realised here. The model 8432 is equipped with bidirectional overload protection.

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präzision miniatur kraftsensor 8431 8432 überlastschutz burster precision load cell overload protection

Productinformation

Measuring range	8431 0 ... ±5 N 0 ... ±10 N 0 ... ±20 N 0 ... ±50 N 0 ... ±100 N 0 ... ±200 N 0 ... ±500 N 0 ... ±1 kN 0 ... ±2 kN 0 ... ±5 kN 0 ... ±10 kN 0 ... ±20 kN 0 ... ±50 kN 0 ... ±100 kN 8432 0 ... ±2,5 N 0 ... ±5 N 0 ... ±10 N 0 ... ±20 N 0 ... ±50 N 0 ... 100 N 0 ... ±200 N 0 ... ±500 N 0 ... ±1 kN 0 ... ±2 kN
Direction of force	Tension and compression
Standardization	Optional
Signal output	8431 15 ... 40 mV/V 0.4 mV/V 0.8 mV/V 2 mV/V Depending on measuring range 8432 15 mV/V 0.75 mV/V 1.5 mV/V 2 mV/V Depending on measuring range
Protection class	IP65
Overload protection	8431 No 8432 Yes
Pull-plate	No
Load introduction button	No
Range of operating temperature	-55 ... +120 °C
Specific characteristics	Measuring ranges from 0 ... 2.5 N to 0 ... 100 kN Protection class IP65 Very robust against lateral forces due to stabilising diaphragms Relative linearity deviation from ≤ ±0.15 % F.S. Model 8432 with overload protection for tension and compressive direction

8431_8432
DE EN PL

Load cells for production, automation, development and quality assurance
DE EN

Haptics test on premium controls
DE EN

8431_8432
DE EN

Crack detection on solar cells
DE
Strength experts
DE EN

The 8431 and 8432 model series are among our most precise and at the same time mechanically robust miniature load cells. High accuracy, fine measuring range graduation, simple load application via the opposing threaded connections and small dimensions of the sensor body open up a very wide range of applications in the laboratory and production. In many applications, its complex design with integrated stabilising diaphragms and overload protection reduces the addition of external overload protection and guidance of the parts introducing the force. As a result, less space is required, less material and weight is used and, last but not least, there is hardly any friction on components that could falsify the measurement result.

The force to be measured is introduced centrally and axially into the cylindrical sensor body through the two external threads in the tension or compressive direction. This requires the sensor to be mounted without the front of the sensor housing coming into contact with attachments. Two stabilising diaphragms inside the sensors of the smaller measuring ranges reduce the lateral force and torque influence to a minimum and ensure high long-term stability of the measurement on the mechanical side. Even if the precision miniature load cell keeps external forces away from the measuring element due to its design, torsional and bending moments on the sensor axis should be avoided. The sensors work independently of position. They have an active side that acts directly on the measuring element, while the passive side is firmly connected to the cabinet.

Rod ends with internal/external thread for force transmission
DE EN

Measuring ranges of 0 to 2.5 N and 0 to 100 kN
Temperature compensator for range -55 °C to 200 °C
Excellent long-term stability, designed for high load cycles
Minor construction cost due to simple installation and insensitivity to outside forces

TASK

Inspecting the tactile behavior entails the precise measurement of the most minute operational forces, click ratio, blocking loads, et al.

SPECIFIC REQUIREMENT

Small forces
Insensitivity to lateral forces
Quick reactions so it can recognize lock-in positions

SOLUTION

The precision miniature pressure sensor should be installed between a linear unit operated with an electric multiphase motor and a tappet. This ensures the exact and sensitive activation of the switch and pushbutton, whose actuating force, switch points, stop points and release points should be defined. Any lateral forces on the sensor axis which might be caused by the "soft" placement of operating elements are absorbed by the supporting diaphragms inside the sensor and kept away from the actual sensing element. This prevents them from having any influence on the sensor results.

Branchen

Automotive

Electronics / Electr. Engineering

Aerospace Industry

Medical Technology

Utility Vehicles

Defence

Built-in overload protection
Load cell insensitive to lateral forces
Small measuring ranges available
Detachable threaded load adapter

task

In instrument-making and precision engineering, sensitive parts such as hands and needles need to be fastened to spindles. Handling must be delicate enough to avoid damaging these intrinsically lightweight components yet firm enough to ensure they sit securely in place. The 8432 load cell chosen here, with integral mechanical overload protection, is designed to measure small loads in a very sturdy package. In addition, any lateral forces that inevitably arise in this process and produce a bending moment on the sensor axis have no impact on the measurement accuracy.

Branchen

Biotechnology

Chemical Industry

Precision Engineering

University / Research Facility

Calibration Services

Non-linearity < 0.15 % F.S.
Easy to fit inside the tool
No friction-generating guides needed thanks to integral support diaphragms

Task

A multipurpose tool is fitted with several load cells, operated by push rods. First the tool presses the separate parts together. Next, specially designed flanging is reshaped in order to join the parts securely together. The 8431 load cell is ideal for fitting in the limited space available and for the required easy replacement. Thanks to its built-in support diaphragms, there is no need for any additional guidance mechanism for transferring the force.

Watch our Installation video at: www.youtube.com/bursterVideo

Branchen

Automotive

Precision Engineering

Dynamic measurement of force/displacement characteristics with OK/NOK monitoring
Integration into full automation via universal fieldbus interfaces such as PROFINET
Up to 128 measurement programs for flexible type management

Task

As an alternative to fixed-contact power rails and busbars, backplanes with spring contacts enable individual testing and replacement of a battery’s cells. Dimensional accuracy and spring characteristics are critical to the quality of such contacts, so 100 % checking has to be carried out on each contact terminal.

Special Features

OK/NOK testing with high accuracy for force and displacement channels
Acquisition and transmission of quality-relevant parameters spring rate, hysteresis and contact spring initial height h₀

Lösung

By means of an automatic X/Y positioning unit, each spring contact is positioned under an electrical linear actuator with a 8431/32 strain gage force sensor mounted on the front end, and a test stroke is initiated orthogonally to the spring contact. Depending on the design of the spring contact, a test stroke of typically only < 1 mm compression is performed within the permissible elastic spring deflection. The DIGIFORCE® 9307/9311 process monitoring can record the quality-relevant parameters of initial height h₀, spring rate and hysteresis, and check them for compliance with tolerance specifications. An OK/NOK evaluation and measured values for reporting are made available at various interfaces.

Video Application