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Xforce Load Cells

Patented Xforce load cells—exclusively from Zwick Roell

 

Xforce load cells are ideal for tensile tests, compression tests, and flexure tests as well as for cyclic tests with zero crossing. The highly accurate patented Xforce load cells are used for all our load frame series. We make no compromises when it comes to quality.

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Product information: Xforce force-measurement system icon_down.png      

 

Product information: Xforce load cell     icon_down.png

 
 
Significant Advantages and Features

Advantages and features

 

  • Xforce load cells are based on a rotation-symmetrical or axis-symmetrical design principle, making them highly resistant to transverse forces.
  • All Xforce load cells are highly insensitive to parasitic influences such as transverse forces, bending moments, torque, and temperature variations.
  • Xforce load cells are very robust and can withstand loads up to 300% of nominal capacity without mechanical failure and up to 150% without zero-point shift.
  • These intelligent load cells have a unique electronic identification system stored on an internal EEPROM.
  • Xforce load cells fulfill all five criteria of the ISO 7500-1 accuracy classes over a very large measurement range.

 

The heart of the testing system

 

Xforce load cells—the heart of the testing system

High-quality load cells are essential for achieving reliable, interpretable test results. To ensure that this core element is optimally integrated in the testing system, Zwick Roell has developed its own series of load cells: Xforce P (Precision), Xforce HP (High Precision), and Xforce K

 

  • The highly accurate Xforce P load cells are intended for use in tests which do not involve high transverse forces. This includes many tensile tests (though not on shear specimens, for example) as well as compression, flexure, and component tests in which no high transverse forces, bending moments, or torsional moments occur.
  • Xforce HP and Xforce K differ from Xforce P load cells primarily in their larger measurement range and greater resistance to parasitic influences, such as bending moments, torsional moments, and temperature variations. They are ideally suited to all static tensile, compression and flexure tests and are equally suitable for pulsating or cyclic tests with zero crossing.
  • Before dispatch, each load cell is calibrated with the testing machine plus drive and the measurement and control electronics as a complete system. This is recorded in the supplied factory calibration certificate.

 

All components from a single source: Zwick Roell develops and produces all system components in-house: testXpert II testing software, testControl measurement and control electronics, Xforce load cells, and all mechanical components.

 

Tips Tips for optimal test results

 

 

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  • Connections between the load cell and the components attached to the system, together with the test fixtures, should be as rigid and free of play as possible. This is because load cells frequently have to measure forces which change rapidly.
  • The smaller the test arrangement and therefore the lower the height, the fewer lever-arm effects will arise. Adapter units and extensions in particular generate undesirable lever-arm effects.
  • Lever arms and eccentricities should be avoided as far as possible in order to minimize bending moments. The further away from the test axis the force application point is, the greater is the influence of the bending moments.
  • Test fixtures/specimen grips and specimen must be aligned exactly to the test axis to enable controlled force application and distribution in the specimen to allow reliable, informative test results to be obtained. Alternatively, swiveling or spherical connections can be used to allow test fixtures to self-align and adapt to the specimen.
  • If several load cells are in use, or in the event of frequent load cell changes, we recommend use of the 2nd load cell connection option.
    Alignment to the test axis is better via the plug-in system than via the usual threaded mounting, while reference positions for different test arrangements are also re-attained automatically. With the threaded fastening the reference positions change according to the number of turns. In addition, installation and removal is considerably easier with the plug-in system, which also avoids unnecessary strain on the load-cell cables.
  • Protect the load cell against overloadby adjusting the force thresholds in line with the test sequence. The testing system switches off automatically if these force thresholds are reached. They can be set either directly on the testing system as hardware limit switches or in the testing software as software limit switches. In the case of tests in which set force-thresholds are not sufficient to exclude the risk of damage to the load cell, we recommend overload protection.
  • The ambient temperature must be kept broadly constant during the test to avoid the measurement signal being influenced by temperature fluctuations. testXpert II testing software Self-identifying sensor plug

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Self-identifying sensor plug

 

  • These intelligent load cells have a unique electronic identification system stored on an internal EEPROM.
  • The testXpert II testing software automatically identifies the sensor type and properties.
  • Force and travel limits are automatically imported.
  • Sensor overloads plus date are stored in the EEPROM.
Xforce Load Cells at a Glance

3:14      Patented Xforce load cells – exclusively from Zwick Roell

            Xforce load cells are ideal for tensile tests, compression tests, and flexure tests as well as for cyclic tests with zero crossing.

Calibration and Accuracy to ISO 7500-1

 

ISO 7500 metallic materials—Verification of static uniaxial testing machines consists of two parts:

 

  • ISO 7500-1: Tension/compression testing machines—Verification and calibration of the force-measuring system
  • ISO 7500-2: Tension creep testing machines—Verification of the applied force

ISO 7500-1 contains general information on requirements for and on the verification and calibration of tensile, compression and flexure testing machines; spring testing machines and fatigue testing machines. Accuracy to ISO 7500-1