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UCI Hardness Tester
The UCI method (Ultrasonic Contact Impedance) is successfully used in hardness testing since many years. A rod is excited into a longitudinal oscillation. At the tip of the rod, a Vickers diamond is placed. This diamond is pressed to the specimen with a discrete test load. Mostly the test load F is applied through a spring. The rod oscillates with its self-resonant frequency which depends essentially on its length. When the Vickers diamond penetrates the specimen, the oscillation of the rod is damped. This causes a shift Df of the resonance frequency, which can easily be measured.

The damping of the rod and the resulting shift in resonance frequency depends on the size of the area of contact between the diamond and the specimen and therewith on the hardness of the material if the test load is constant. Beneath the hardness, the elastic modulus of the material also affects the frequency shift. The hardness of the material can be calculated from the known test load, the measured frequency shift and the material calibration factor (for taking the elastic modulus into account).
 
Leeb Rebound Hardness Tester
The Leeb hardness testing method is a dynamic hardness testing procedure.

Over the spring force a impact device (Carbide balls, for special applications a diamond tip) is fired onto the sample surface. The measurand is the difference between the impact and rebound speed of the impact body. The loss of the velocity is directly related to the hardness, taking account of the calibration and in accordance to influence of the mass and the surface of the sample.
Other Products
 
QH5 D

The dmq "QH Series" Leeb rebound hardness testers are a practical and reliable alternative (not a replacement) to the traditional bench hardness testers. Obtain quick measurements with immediate conversions to the more common hardness units such as Rockwell, Brinell, Vickers, and Shore. Mechanical resistance can also be measured.

Connect a dmq type D or DC impact device to the QH5 and measure the widest range of metals, hardness units, and hardness ranges covered in the Leeb method.

All QH5 models feature histogram graphics, real time statistics, selectable viewing modes, a Data Logger to store 32000 readings that can be sent to a PC, and much more.
  • Resolution of +/- 1HL
  • Accuracy +/- 4HL (0.5% at 800HL)
  • Impact Angles - 0°, 45°, 90°, 135° and 180°
  • Impact Devices supported - D, DC
  • Automatic hardness unit conversions
  • Units - HL (Leeb), HB (Brinell), HV (vickers), HRC (Rockwell C), HRB (Rockwell B), HS (Shore), Rm (Mechanical Ressistance), User Units : USR-A & USR-B
  • Materials - Steel, Cast Steel, Alloy Tool Steel, Stainless Steel, Grey Cast Iron, Spheroid Iron, Cast Aluminum, Brass, Bronze, Wrought Copper
 
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QH5 G

The dmq "QH Series" Leeb rebound hardness testers are a practical and reliable alternative (not a replacement) to the traditional bench hardness testers. Obtain quick measurements with immediate conversions to the more common hardness units such as Rockwell, Brinell, Vickers, and Shore. Mechanical resistance can also be measured.

Connect a dmq type G impact device to the QH5 and measure the hardness in massive, founded, and or forged parts with rough surface finishes. In Brinell measure up to 650 HB.

All QH5 models feature histogram graphics, real time statistics, selectable viewing modes, a Data Logger to store 32000 readings that can be sent to a PC, and much more.
  • Impact rebound Leeb method
  • Resolution of +/- 1HL
  • Accuracy +/- 4HL (0.5% at 800HL)
  • Impact Device suppoterd - Types : G
  • Impact Angles - 0°, 45°, 90°, 135° and 180°
  • Units - HL (Leeb), HB (Brinell), HRB (Rockwell B), Rm (Mechanical Ressistance), User Units : USR-A & USR-B
  • Materials - Steel and Cast Steel, Grey Cast Iron, Spheroid Iron
  • Measuring Ranges - 200 a 960 HL (Leeb)
    Steel and Cast Steel : 90-646 HB (Brinell), 48-100 HRB (Rockwell B), 305-2194 N/mm2 (Rm)
    Grey Cast Iron : 92-326 HB (Brinell)
    Spheroid Iron : 127-364 HB (Brinell)
 
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QH5 M

The dmq "QH Series" Leeb rebound hardness testers are a practical and reliable alternative (not a replacement) to the traditional bench hardness testers. Obtain quick measurements with immediate conversions to the more common hardness units such as Rockwell, Brinell, Vickers, and Shore. Mechanical resistance can also be measured.

The QH5 M supports all dmq impact devices so that you can cover all portable hardness testing applications by quickly connecting and disconnecting devices.

Multiple impact devices usually means frequent changes in the device being used. But with CalTag technology - exclusive from demeq - changing devices does not require unit calibration.
  • Impact rebound Leeb method
  • Resolution of +/- 1HL
  • Accuracy +/- 4HL (0.5% at 800HL)
  • Impact Devices supported - Types : D, DC, DL, C, G
  • Impact Angles - 0°, 45°, 90°, 135° and 180°
  • Units - HL (Leeb), HB (Brinell), HV (vickers), HRC (Rockwell C), HRB (Rockwell B), HRA (Rockwell A), HS (Shore), Rm (Mechanical Ressistance), User Units : USR-A & USR-B
  • Materials - Steel, Cast Steel, Alloy Tool Steel, Stainless Steel, Grey Cast Iron, Spheroid Iron, Cast Aluminum, Brass, Bronze, Wrought Copper.
 
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AlphaDUR II

The alphaDUR II has proved its worth as a reliable and versatile hardness tester since many years. It can be employed from simple manual measurements to fully automated production testing.

The operation of the alphaDUR II is very easy because all information is shown on the large display. Hardness scale and material can quickly be changed by context-sensitive function keys.

Measurements can be done fast and accurate. The measured value is displayed directly after the test load has been applied. A test load between 1 and 10 kg can be chosen depending on the application and the sample surface.

  • Hardness scale: HRC, HV, HB, HRB and tensile strength
  • Test load : 10, 20, 30, 49 or 98 N, depending on the UCI probe
 
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