Linshang Leeb Hardness Tester Selection and FAQ

From:Linshang Time:2022/11/29 09:57:13 Browse:109

The Leeb hardness tester is an instrument for testing the hardness of materials, mainly used for hardness metal materials detection. According to the Leeb principle, the hardness value is the ratio of the rebound speed and the impact speed of the punch at a distance of 1 mm from the surface of the sample after a specified mass impact body which at a certain speed with an elastic force.

Linshang Leeb hardness tester can converts between Leeb (HL), Vickers (HV), Brinell (HB), Shore (HS), Rockwell (HRA), Rockwell (HRB), Rockwell (HRC). And it has simple operation and high precision. At present, Linshang has five products: LS251D, LS252D, LS252DC, LS252DL, and LS252C. The following will introduce the prices, parameters and characteristics of the above-mentioned Leeb hardness testers.

LS251D test cast steel
LS251D test cast steel
LS252C test steel bar
LS252C test steel bar
LS252D test flange
LS252D test flange
LS252D test standard block
LS252D test standard block
LS252DC test wheel hub
LS252DC test wheel hub
LS252DL test gear
LS252DL test gear

Linshang Leeb Hardness Tester SelectionTable

Model LS251D LS252D LS252DC LS252DL LS252C
Application Ordinary metal parts Ordinary metal parts Short size, suitable for internal holes or narrow areas Slender narrow groove, tooth flank or bottom of bore Hardfacing and small or thin components
Probe Split Integrate
Impact Device D DC DL C
Hardness Scales HL, HV, HB, HS, HRA, HRB, HRC HL, HV, HB, HS, HRC
Measurement Range HLD(170-960); HV(83-976); HB(30-651); HRC(17.6-68.5); HS(26.4-99.5); HRB(13.5-100); HRA(60-85.8) HLD: (170-960); HV(194-976); HB(188-651); HRC(17.6-68.5); HS(29.54-99.5); HRB(91.5-100); HRA(60-85.8) HLC: (170-960); HV(80-996); HB(80-683); HRC(20-69.5); HS(31.9-102.3);
Size Host Size: 142*72*28 mm
Probe Size: 148*31*25 mm
148*34*24mm 88*34*24mm 203*34*24mm 140*34*24mm
Weight About 270g About 68g About 48g About 78g About 66g
Standard Hardness Block Equipped Without equipment
Accuracy ±12 HL, ±6 HL typical
Repeatability 6HL
Resolution 1HL
Working Temperature Range -10~50℃, 0~85%RH( no condensation)
Storage Temperature Range -10~60℃, 0~85%RH( no condensation)
Packing Plastic Case Printed packaging box
Display 240 * 16 dot matrix LCD 128 * 64 dot matrix OLED
Power Supply 2 AA alkaline dry batteries Rechargeable lithium battery 3.7V@250mAh, full charge for over 5000 continuous measurements

Introduction

1. Linshang Leeb hardness tester advantages

  • Using advanced digital probe technology, test accurately.

  • The probe has a built-in direction sensor to automatically compensate the measurement errors in different impact directions.

  • A variety of hardness scales switchable, eliminating the tedious manual check table.

  • Cutting-edge dual-coil technology bring the tester extraordinary measurement accuracy and good repeatability.

2. Linshang Leeb hardness tester

D impact probe, suitable for hardness measurement of ordinary metal parts
Separate design, digital probe technology
QC mode, rapid inspection
D impact device, suitable for hardness measurement of common metal parts
Integrate design, compact size
DC impact device, suitable for measurement in bore or cylinder
Integrate design, small size
DL impact device, suitable for hardness measurement in narrow space
Integrate design, slender probe
C impact device, suitable for measuring small-mass or thin-thickness metal parts
Integrate design, small size

Frequently Asked Questions

  1. Why is the test data inaccurate?

    1. The surface of the measured object is too rough or dirty

    2. The weight and thickness of the measured object is less than the specified value

    3. The ambient temperature exceeds the working temperature during the test

    4. There is magnetic field interference around the test

  2. What's the difference between LS251D and LS252D?

    1. LS251D is separation design, LS252D as integrate design, more compact portable;

    2. LS251D can measure tensile strength (σb);

    3. LS251D has QC inspection;

    4. LS251D is equipped with standard hardness blocks, which can be used for calibration; other integrated models are not equipped and need to be purchased separately;

    5. LS251D is packed in engineering plastic box, and other integrated products are packed in color gift box

  3. What's the difference between LS252D and LS252DC?

    The probe devices are different. LS252D is a D-type impact device and LS252DC is a DC type impact device.

    The loading modes are different. LS252D is press loading and LS252DC is push loading.

  4. What is the difference between a type D impact device and a type DC impact device?

    There are D /C /DC /D+15 /G type impact devices, according to the actual situation of the workpiece to meet different needs. D is a standard probe suitable for most scenes, DC type is suitable for very cramped places (inside the hole, cylinder) measurement.

  5. Is there any difference between leeb hardness tester and other hardness tester (Rockwell, Vickers, etc.)?

    Different hardness tester have different testing principles and different measurement methods. The application scenarios are also different. Most of the Rockwell and Vickers hardness testers are desktop, while the Leeb hardness tester is handheld and easy to carry. According to the national standard GBT 17394.4, hardness values can be converted between. Linshang leeb hardness tester can be a variety of hardness standard automatic switching, eliminating manual table lookup cumbersome.

  6. What if the test value of the Leeb hardness tester is out of tolerance?

    First determine whether the measured object is qualified, and then calibrate the instrument with a standard block. If it is still not accurate, it is recommended to return to the factory for calibration.

  7. What is the minimum measurement weight and thickness of the Leeb hardness tester?

    If it is necessary to measure items less than the minimum thickness, it needs to be coupled to a strong support.

Leeb Hardness Tester Requirements for Sample Weight and Thickness

Impact Device Minimum Mass Minimum Thickness(uncoupled) Minimum Thickness(coupled)
D,DC,DL,D+15,S,E 5kg 25mm 3mm
G 15kg 70mm 10mm
C 1.5kg 10mm 1mm