Equotip Hardness Tester

Equotip is a versatile portable hardness tester offering extended capabilities and unmatched ease of operation in measuring accurate hardness reading of metallic components. Equotip Hardness Tester utilizes a proven and dynamic testing principle.

The tester is used for virtually all applications due to its flexibility, ease of use, fast and accurate measurement. In addition, it is also suitable for all kinds of metals, even curved surfaces and hard to access test location can be tested, including overhead positions.

Equotip has simple operating elements that allow for precise measurement and is easy to use. The operator can just simply load the impact device by sliding the loading tube forward. He then places and holds the impact device on the surface of the test piece at the desired test point. The impact is subsequently triggered by pressing the trigger button, and the hardness value including other information will be instantaneously displayed on the display of the tester.

Nusatek provides Equotip Hardness Testers with Type D impact tip which has the following capabilities: 

  • Test range for steel and stainless steel material is between 81-654 HB
  • Standard surface preparation required is maximum surface roughness depth, Rt ≤10µm
  • Minimum Thickness of sample for uncouple is 25mm while couple is 3mm.

 

Advantages of Equotip Hardness Tester:

  • Good for all metallic materials
  • Ideal for production level testing
  • Suitable and recommended for on-site testing of heavy, big or already installed parts
  • Handy for difficult to access or confined test locations
  • Easy to use and accurate on curved test surface (R > 10 mm)
  • Reading can be stored automatically in the internal memory

 

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    Rebound Principle of Equotip Hardness Testers

    The portable hardness testers used most commonly for metals are based on the Leeb rebound method invented by Proceq SA. The Equotip tester operates according to the Leeb principle, in which the hardness value is calculated from comparing the energy of a test body before and after impacting on a sample. This Energy QUOtient (EQUO) is quoted in the hardness unit HL and is calculated from comparing the impact and rebound velocities (vi, vr) of the impact body. It rebounds faster from harder samples than from softer ones, resulting in a greater energy quotient which is defined as 1000 vr/vi.

     

    EQUOTIP Impact Device D

    Equotip uses a proven, dynamic testing principle. An impact body with a hard metal test tip is propelled by spring force against the surface of the test piece. Surface deformation takes place when the impact body hits the test surface, which will result in loss of kinetic energy. This energy loss is detected by a comparison of velocities vi and vr when the impact body is at a precise distance from the surface for both the impact and rebound phase of the test, respectively.

    Velocity measurements are achieved through a permanent magnet in the impact body that generates an induction voltage in the coil of the impact device. The signal voltage is proportional to the velocity of the impact body. Signal processing provides the hardness reading for display and storage.

    Impact device D
     
    Cross-cut of typical impact Device

     

    Operating Procedure of the EQUOTIP Hardness Tester

    1.Load
    Simply load the impact device by sliding
    the loading tube forward.
     
    2. Place
    Then place and hold the impact device on
    the surface of the test pieces at the desire
    test point
     
    3. Measure
    Trigger the impact by pressing the trigger button. The hardness value will be instantaneously displayed
     
    4. Display
    Showing all information on a large
    clear display

     

    Hardness testers using the Rebound method operate in a slightly different manner. Although the size of the test indentation generated is connected with the material hardness even in this case, it is indirectly measured via the loss of energy of a so-called impact body. A mass is accelerated to the surface of the test object and impinges on it at a defined speed, i.e. kinetic energy. The impact creates a plastic deformation of the surface, i.e. an indentation, due to which the impact body loses part of its original speed or energy. It will lose more velocity when creating a bigger indentation on softer material. Thus the surface roughness and the material thickness have high influence in the out-come of hardness value result. The recommended surface roughness and the material thickness of test steel material should be as follows.

    • Standard surface preparation required is maximum surface roughness depth Rt ≤10µm
    • Minimum Thickness of sample for uncouple is 25mm while couple is 3mm.