TQ-3C Special Rebound (Leeb) hardness tester, probe and adapter for non-destructive testing
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TQ-3C Special - Rebound (Leeb) hardness tester

Leeb hardness testers

High-precision hand-held instrument engineered for demanding production and field conditions, delivering reliable non-destructive testing capabilities. Designed for assessing production quality, it finds utility across various industries such as metallurgy, mechanical engineering, aircraft, shipbuilding, atomic industry, and oil and gas.

Operating on the Leeb method, this hardness tester provides robust control over the hardness of a wide range of materials, including:

  • All basic types of metals and alloys without necessitating additional calibrations (such as structural, tool, corrosion-proof, heat-proof, non-corrosive steels and alloys, as well as alloys of nonferrous metals, cast iron, aluminum, bronze, and brass).
  • Components with surface hardening and high-frequency current hardening.
  • Complex-shaped items.
  • Heavy and large items with rough surfaces.



Operational advantages


TQ-3C Special Rebound (Leeb) hardness tester in use
  • Wide range of controlled metals and alloys.
  • Low sensitivity to surface curvature and roughness.
  • Monitoring of hardness changes along the surface.
  • Stable measurements independent of force and time of probe pressing.
  • Material identification capability in blank production.
  • Control of “volumetric” hardness.

Features

  • Impact-, dust-, and water-proof housing.
  • Bright color display for operation in sub-zero temperatures, remaining visible under varying lighting conditions.
  • Signalization of threshold readings exceedance.
  • Unique system for statistical data processing and averaging of readings.
  • Swift adjustment of readings and programming of additional calibrations to basic scales using two or fewer standard blocks.
  • Flexible device memory for recording and analyzing readings.
  • Programming of additional scales calibrations by two or fewer standard test blocks.
  • Rapid programming of additional scales using two to ten standard test blocks.

Probes characteristics


Photo Probe Type Weight/thickness/
surface roughness
of the article
under check

Length/
Diameter

Application
«D» 3 kg/6 mm/Ra 3,2 138/21 mm Solving of main hardness testing tasks with surface roughness less than 3.2 Ra
«E» 3 kg/6 mm/Ra 3,2 138/21 mm Probe with polycrystalline indenter made of cubic boron nitride to test materials with high hardness
«G» 8 kg/55 mm/Ra 7,6 200/29 mm Hardness testing of high structure inhomogeneity items with surface roughness more than 7.2 Ra

Probes variations for Rebound (Leeb) hardness testers

Exploitation


Exploitation requirements

  • Items heavier than 5 kg and thicker than 6 mm require no additional preparation.
  • Hard items (e.g., tubes) with an anticipated hardness of 90 to 250 HB and thickness greater than 4 mm need no additional preparation.
  • Other items should be affixed on a support plate using fixing paste.
  • Measurement accuracy is contingent upon the roughness of the controlled surface, which depends on the probe.

Hardness testers modes

Measurement mode Readings Using
By basic scales Basic hardness units (HRC, HB, HV) Hardness testing of the bulk of products
By additional calibrations to basic scales By HRA, HRB, HSD scales and ultimate tensile strength Hardness testing of high-alloy steels, special cast iron and nonferrous metals
By additional scales Scales are programmed by the user Special problems solving

The statistical parameters used for processing measurements

  • Maximum, minimum, and mean values.
  • Standard deviation from the mean.
  • Average deviation from user-set values.
  • Number of results outside the upper/lower limit range specified by the user.
  • Maximum deviation from the upper/lower border.
  • Automatic elimination of erroneous results.
  • Comparison of measurement results in series using comparison charts displayed on the hardness tester.

Technical specifications


Characteristic Values
Relative average error at regular calibration  3-5 %
Hardness testing ranges:
Rockwell C 20-70 HRC
Brinell 90-450 HB
Vickers 240-940 HV
Spot diameter on the item surface for probe positioning From 7 mm
Quantity of possible additional scales calibrations 5 for each scale
Quantity of additional scales 3
Duration of the measurement 2 seconds
Quantity of measurements for average reading calculation 1-99
Memory capacity 12 400 readings
Maximum quantity of named blocks of readings generated in memory 100
Signalization about threshold exceeding Provided
PC connection USB
Power supply Li-ion accumulation battery
Dimensions of hardness tester electronic unit 121x69x41 mm
Weight of electronic unit 0.3 kg
Weight of D-probe 0.15 kg
Operating temperature range -15…+35 °C
Warranty 1 year
TQ-3C Special Rebound (Leeb) hardness tester with probes variations

Delivery set


Delivery set of TQ-3C Special Rebound (Leeb) hardness tester
Elements Leeb Hardness tester
TQ-3C
Leeb Hardness tester
TQ-3C special
Electronic unit with accumulation battery + +
D-type probe +  
Special probe type-D with socket   +
Connecting cable for D-type probe   2 pcs 
Adapter “Z3”   +
Standard test block HB   +
Charger + +
Operating manual + +
PC cable + +
Soft case + +
Cuff to fix device on arm  + +
Bag for carrying and storing + +

Accessories

  • Replaceable probes of various constructions and impact forces.
  • Adapter “Z3” for simplified probe positioning on complex surfaces.
  • Connection cables.
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