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GAOTek Leeb Hardness Tester with Built-In Printer (High Precision)
GAOTek Leeb Hardness Tester with Built-In Printer (High Precision)

GAOTek Leeb Hardness Tester with Built-In Printer (High Precision)

ID: GT00Y100ZJ
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Overview

GAOTek Leeb Hardness Tester with Built-In Printer (High Precision) is an accurate, fast and stable hardness testing equipment based on the principle of Leeb hardness testing theory which can measure the Leeb hardness of all metallic materials and is equipped with a built-in printer. This device can be used in the Failure analysis of pressure vessel, steam generator and other equipment and it can directly display hardness scales HRB, HRC, HRA, HV, HB, HS, HL. The built-in thermal printer is convenient for applications in field printing.

Key Features

  • Wide measuring range: (170~960)HLD
  • Large LCD screen (128 × 64 dot matrix)
  • Direct display of hardness scales HRB, HRC, HRA, HV, HB, HS, HL
  • Data memory: can store 500 groups (Relative to average times 32~1)
  • Seven different impact devices available, automatic identification of impact device type
  • User calibration function
  • Upper and lower limit can be pre-set. Automatic alarm when the result value exceeds the limit
  • Auto power off
  • Battery indicator
  • NI-MH rechargeable battery provides continuous working period of no less than 150 hours
  • EL backlight
  • Software to connect with PC via USB port
  • Printing paper: width is (2.26 ±0.01) in(5 ±0.5)mm, diameter is 1.18 in (30 mm)
  • Battery pack: 6V NI-MH
  • Battery charger: 9 V/500 mA
  • Continuous working period :about 150 hours (With backlight off, no printing)

Technical Specifications

Impact Device Type D
Measuring Range 170 HLD ~ 960 HLD
Measuring Direction 360°
Working Temperature 14 °F ~ 122 °F (-10 °C ~ 50 °C)
Storage Temperature -22 °F ~ 140 °F (-30 °C ~ 60 °C)
Relative Humidity ≤90 %
Printing Paper Width 2.26 ±0.5 in (57.5 ±0.5 mm)

Diameter 1.18 in (30 mm)

Battery 9 V NI-MH
Battery Charger 9 V/500 mA
Dimensions 8.34 in × 3.14 in × 1.25 in (212 mm × 80 mm × 32 mm)

Additional Information

Main Applications

  • Die cavity of molds
  • Bearings and other parts
  • Failure analysis of pressure vessel, steam generator and other equipment
  • Heavy workpieces
  • Installed machinery and permanently assembled parts
  • Testing surface of a small hollow space
  • Material identification in the warehouse of metallic materials
  • Rapid testing in large range and multi-measuring areas for large-scale workpieces

Leeb Hardness Testing Principle

The basic principle is: an impact body of certain weight impacts against the testing surface under certain test force. Then the impacting velocity and the rebounding velocity of the impact body are measured respectively when the spherically test tip is located 1 mm above the testing surface.

The calculation formula is as follows:

HL=1000 × VB/ VA

Where,   HL — Leeb hardness value

VB — Re-bounding velocity of the impact body

VA — Impacting velocity of the impact body

Structural Features

The Hardness Tester

  1. Main Unit
  2. Impact Device

Parts of the Main Body

  1. Socket of impact device
  2. Socket of USB
  3. LOGO
  4. Paper compartment cover
  5. LCD display
  6. Keypad
  7. Battery switch
  8. Power jack
  9. Serial Number
  10. Product label
  11. Battery compartment cover

D Type Impact Device

  1. Release button
  2. Loading tube
  3. Guide tube
  4. Coil unit
  5. Connection cable
  6. Impact body
  7. Support ring

Different Types of Impact Devices

Testing Range

Material Method Impact device
D/DC D+15 C G E DL
Steel and cast steel

 

HRC 20~68.5 19.3~67.9 20.0~69.5 22.4~70.7 20.6~68.2
HRB 38.4~99.6 47.7~99.9 37.0~99.9
HRA 59.1~85.8 61.7~88.0
HB 127~651 80~638 80~683 90~646 83~663 81~646
HV 83~976 80~937 80~996 84~1042 80~950
HS 32.2~99.5 33.3~99.3 31.8~102.1 35.8~102.6 30.6~96.8
Cold work tool steel HRC 20.4~67.1 19.8~68.2 20.7~68.2 22.6~70.2
HV 80~898 80~935 100~941 82~1009
Stainless steel

 

HRB 46.5~101.7
HB 85~655
HV 85~802
Grey cast iron

 

HRC
HB 93~334 92~326
HV
Nodular cast iron HRC
HB 131~387 127~364
HV
Cast aluminum alloys HB 19~164 23~210 32~168
HRB 23.8~84.6 22.7~85.0 23.8~85.5
BRASS (copper zinc alloys)

 

HB 40~173
HRB 13.5~95.3
BRONZE

(copper-aluminum/tin alloys)

HB 60~290
Wrought copper alloys HB 45~315
Type of impact device DC(D)/DL D+15 C G E
Impacting energy Mass of impact body 11 mJ (0.012 lbs/0.015 lbs) (5.5 g/7.2 g) 11 mJ

(0.07 lbs) (7.8 g)

2.7 mJ

(0.006 lbs) (3.0 g)

90 mJ (0.044 lbs) (20.0 g) 11 mJ

(0.012 lbs) (5.5 g)

Test tip hardness:

Dia. Test tip:

Material of test tip:

1600 HV

0.11 in (3 mm)

Tungsten carbide

1600 HV

0.11 in (3 mm)

Tungsten carbide

1600 HV

0.11 in (3 mm)

Tungsten carbide

1600 HV

0.19 in (5 mm)

Tungsten carbide

5000 HV

0.11 in (3 mm)

synthetic diamond

Impact device diameter:

Impact device length:

Impact device weight:

0.78 in (20 mm)

86 (147)/75 mm

0.11 lbs (50 g)

0.78 in (20 mm)

6.37 in (162 mm)

0.17 lbs (80 g)

0.78 in (20 mm)

5.55 in (141 mm)

0.16 lbs (75 g)

1.18 in (30 mm)

10 in (254 mm)

0.55 lbs (250 g)

0.78 in (20 mm)

6.10 in (155 mm)

0.17 lbs (80 g)

Max. hardness of sample 940 HV 940 HV 1000 HV 650 HB 1200 HV
Mean roughness value of sample surface Ra: 1.6 µm 1.6 µm 0.4 µm 6.3 µm 1.6 µm
Min. weight of sample:

Measure directly

Need support firmly

Need coupling tightly

 

>11.02 lbs (5 kg)

4.40 lbs~11.02 lbs (2 kg ~5 kg)

0.110 lbs ~4.40 lbs (0.05 kg ~2 kg)

 

> 11.02 lbs (5 kg)

4.40 lbs ~11.02 (2 kg ~5 kg)

0.110 lbs ~4.40 lbs (0.05 kg ~2 kg)

 

> 3.30 lbs (1.5 kg)

1.10 lbs ~3.30 lbs (0.5 kg ~1.5 kg)

0.044 lbs ~1.10 lbs (0.02 kg ~0.5 kg)

 

> 33.06 lbs

(15 kg)

11.02 lbs~33.06 lbs

(5 kg ~15 kg)

1.10 lbs~11.02 lbs (0.5 kg ~5 kg)

 

>11.02 lbs (5 kg)

4.40 lbs~11.02 lbs (2 kg ~5 kg)

0.110 lbs~4.40 lbs (0.05 kg~2 kg)

Min. thickness of sample Coupling tightly

Min. layer thickness for surface hardening

0.19 in (5 mm)

≥ 0.031 in (0.8 mm)

0.19 in (5 mm)

≥0.031 in (0.8 mm)

 0.03 in (1 mm)

≥0.007 in (0.2 mm)

 0.39 in (10 mm)

≥0.04 in (1.2 mm)

0.19 in (5 mm)

≥0.031 in (0.8 mm)

Size of tip indentation
Hardness 300HV Indentation diameter

 

Depth of indentation

0.02 in (0.54 mm)

 

24 µm

0.02 in (0.54 mm)

 

24 µm

0.01 in (0.38 mm)

 

12 µm

0.04 in (1.03 mm)

 

53 µm

0.02 in (0.54 mm)

 

24 µm

Hardness 600HV Indentation diameter

Depth of indentation

0.02 in (0.54 mm)

 

17 µm

0.02 in (0.54 mm)

 

17 µm

0.01 in (0.32 mm)

 

8 µm

0.03 in (0.90 mm)

 

41 µm

0.02 in (0.54 mm)

 

17 µm

Hardness 800HV Indentation diameter

 

Depth of indentation

0.013 in (0.35 mm)

 

10 µm

0.013 in (0.35 mm)

 

10 µm

0.013 in (0.35 mm)

 

7 µm

 

 

0.013 in (0.35 mm)

 

10 µm

Available type of impact device DC: Test hole or hollow cylindrical;

DL:Testslender narrow groove or hole

D+15: Test groove or re-entrant surface C: Test small, light, thin parts and surface of hardened layer G: Test large, thick, heavy and rough surface steel E: Test super high hardness material


Start-Up
Operation

  • Insert the plug of the impact device into the socket of impact device on the tester.
  • Press【】key, now power is connected.

The instrument is in testing condition.

The screen shows as below

The system would automatically detect the type of the impact device during power up, and would display this information on the screen. Users should pay attention to the probe type displayed on the screen. After pausing for several second, the screen will exit and enter the main display interface.

Note: If the instrument is in power off condition, it will turn on automatically after the charge power is connected.

Loading

Push the loading-tube downwards until contact is felt. Then allow it to slowly return to the starting position or using other method locking the impact body.

Localization

Press the impact device supporting ring on the surface of the sample firmly, the impact direction should be vertical to the testing surface.

Testing

  • Press the release button on the upside of the impact device to test. The sample and the impact device as well as the operator are all required to be stable now. The action direction should pass the axis of the impact device.
  • Each measure area of the sample usually need 5 times of testing operation. The result data dispersion should not more than mean value ±15 HL.
  • The distance between any two impact points or from the center of any impact point to the edge of testing sample should conform to the regulations.
  • If accurate conversion from the Leeb hardness value to other hardness value is required, contrastive test is needed to get conversion relations for the special material. Use inspection qualified Leeb hardness tester and corresponding hardness tester to test at the same sample respectively. For each hardness value, each measure homogeneously 5 points of Leeb hardness value in the surrounding of more than three indentations which need conversion hardness, using Leeb hardness arithmetic average value and corresponding hardness average value as correlative value respectively, make individual hardness contrastive curve. Contrastive curve at least should include three group of correlative data.

Main Display Interface

Type of Impact

Device

Distance of center of the two

indentations

Distance of center of the indentation to sample edge
Not less than Not less than
D, DC 0.11 in (3 mm) 0.19 in (5 mm)
DL 0.11 in (3 mm) 0.19 in (5 mm)
D+15 0.11 in (3 mm) 0.19 in (5 mm)
G 0.14 in (4 mm) 0.31 in (8 mm)
E 0.11 in (3 mm) 0.19 in (5 mm)
C 0.07 in (2 mm) 0.14 in (4 mm)

Instruction of the Main Display Interface

Battery information: Displays the information of the rest capacity of the battery, and the charging status.

Impact direction: The present impact direction.

Average value indicator: It appears to show the mean value of the samples when reaching the pre-setting impact times.

Hardness scale: Hardness method of the present measured value.

Measured value: Display present single time measured value (without mean value indicator), or display the present mean value (with average value indicator prompting).   means over conversion or measure range.  means lower than conversion or measure range.

Material: The present pre-setting material.

Impact times count: Times that have been impacted.

Testing Operation at the Main Display Interface

Testing operation could be carried out under this interface. After each impact operation, it can display the current measured value, impact times count plus one, the buzzer alerts a long howl if the measured value is not within the tolerance limit. When reaching the pre-setting impact times, the buzzer will alert a long howl. After 2 seconds, the buzzer will alert a short howl, and display the mean value.

Key Operation at the Main Display Interface

Press key【SAVE】to store present group of measured value into memory. This operation is only valid after displaying the mean value.

Press key 【DEL】to delete the latest single measured value. After pressing this key, the screen will display as below:

  • Press key 【 】 or key 【  】to move the cursor to【YES】or【NO】.
  • Press key 【 ENTER 】 to confirm operation. Press key【ESC】to cancel delete operation.
  • Pess key 【 】or【】 could display single measured value.
  • Press key【】could switch on or off the background light of LCD.
  • Press key【MENU】could enter the system pre-setting menu.
  • Press key【DIR】to set the impact direction.
  • Press key【CNT】to change the impact times in one group. The impact times count item will be highlighted when first pressing the key【CNT】, and the impact times count value will plus one with each pressing. The value will roll back to 1 when it reaches 32.
  • Press key【SCALE】to change the hardness scale.
  • Press key 【MAT】to change the material set. Pre-setting hardness scale recovers to HL automatically after material pre-setting changed.

Menu Structure

Both pre-setting system parameters and the additional function could come true by menu operation. At the main display interface, press key【MENU】 into the main menu.

 

Test Set

At the main display interface, press key【MENU】 to enter the main menu. Press key 【ENTER】 to enter Test Set Menu.

The symbol ↓ at the left side of underside menu indicates that the menu has not ended. Pressing key 【】could continuously glance downward. The symbol ↑ at the left side of the upside menu indicates that the menu has not ended. Pressing 【 】could continuously glance upward.

Press key 【 】or【】to move the cursor to the line you want to set, and press key

【ENTER】to confirm it.

Note

  1. When 【Hard/σb】is switched to σb, the hardness scale could not be selected. The cursor will skip over 【Hardness Scale】while moves the cursor.
  2. Only D type of impact device has the function of σb measure. So the cursor could not move to 【Hard/ σb】 while use other impact device.

Impact Direction Setting

Press key 【】 or key 【 】to move the cursor to the impact direction that you will pre-set.

Press key【ENTER】to confirm it.

Press key【ESC】to cancel.

Average Time Setting

Press 【 】or【】to move the cursor.

Press 【 】 【  】to change the number. Press key【ENTER】to confirm it. Press key【ESC】to cancel it.

Material Setting

When 【Hard/σb】is pre-set to hardness, it will display the following material: Steel and

Cast Steel, Cold Work Tool Steel, Stainless Steel, Gray Cast Iron, Nodular Cast Iron, Cast Aluminum Alloys, Copper-Zinc Alloys, Copper-Aluminum Alloys, Wrought Copper and Wrought Steel.

Press key【】or【】to move the cursor to the material you want to pre-set.

Press key【ENTER】to confirm it.

Press key【ESC】to cancel it.

Note:

  1. Pre-setting hardness scale recovers to HL automatically after material pre-setting is changed.
  2. Please select material first, then select hardness scale.

When 【Hard/σb】is preset to σb, it will display the following material: Mild Steel, High-Carbon Steel, Cr Steel, Cr-V Steel, Cr-Ni Steel, Cr-Mo Steel, Cr-Ni-Mo Steel, Cr-Mn-Si Steel, Super Strength Steel and Stainless Steel.

Press key【】or【】to move the cursor to the material you want to pre-set.

Press key【ENTER】to confirm it.

Press key【ESC】to cancel it.

No. Material HLD Strength σb (MPa)
1 Mild steel 350~522 374~780
2 High-Carbon steel 500~710 737~1670
3 Cr steel 500~730 707~1829
4 Cr-V steel 500~750 704~1980
5 Cr-Ni steel 500~750 763~2007
6 Cr-Mo steel 500~738 721~1875
7 Cr-Ni-Mo steel 540~738 844~1933
8 Cr-Mn-Si steel 500~750 755~1993
9 Super strength steel 630~800 1180~2652
10 Stainless steel 500~710 703~1676

Hardness Scale Setting

Press key【】or【】to move the cursor to the material you want to pre-set.

Press key【】 or【 】to move the cursor to the hardness scale you want to pre-set.

Press 【ENTER】 to confirm setting.

Press 【ESC】 to cancel setting.

Note:

  1. Here only the valid hardness scale is displayed for the present selected impact device and material. It would not display the hardness scale which is not valid.
  2. Please select material first, then select hardness scale.
  3. Pre-setting hardness scale recovers to HL automatically after pre-setting material is changed.

Tolerance Limit Setting

Press 【】or【】to move the cursor.

Press 【】 or【 】to change the number.

Press 【ENTER】 to confirm setting.

Press 【ESC】 to cancel setting.

Note:

  1. If the setting value exceeds the measure range, the instrument will remind you to reset.
  2. If the bottom limit is larger than the upper limit, they will exchange automatically.

Hardness/σb Setting

Press key【ENTER】to switch between Hard and σb.

Note:

Only D and DC type of impact device has the function of σb measure. So hard is the only selection if the impact device is not D or DC type.

Print Function

At the main display interface, press【MENU】to enter the main menu. Press 【】or【】to move the cursor to print menu and press 【ENTER】to enter the print menu.

Print Current

Print out the data report just finished testing. If the instrument hasn’t been switched off, and hasn’t changed any testing condition during continuous printing process, it will only print out single measured value and average value when printing again.

Print Memory

Print out the selected group of measured value stored inside the instrument.

Print All Memory

Print out all the measured value stored inside the instrument.

Paper Feeding

When the printer is powered on and ready for printing, press 【FEED】 key then the instrument will start manual paper feeding. Press and keep holding the 【FEED】 key to start paper feeding, while releasing the key to stop paper feeding.

Power Off

Press【】key to turn off the instrument.

System Calibration

The tester and impact device must be calibrated using hardness block before use as the first time, or having not been used for a long time, or having reset the system.

Press key【】, meanwhile pressing【ENTER】to power on the system. Then the

Software calibration screen shows as below.

Set the impact direction as【】. Measure 5 points on the standard hardness block.

It would display the average value after measuring 5 times.

Press key【 】 or key【】to input the nominal value.

Press key【ENTER】to confirm. Press key 【 ESC 】 to cancel this operation.

Range of adjustment: ±15HL.

Note:

Calibration is needed every 1 year.

Battery Charge

The instrument uses a NI-MH battery pack as its power source. When the battery pack almost runs out, the battery symbol on the display will glint .  It needs charging as soon as possible. Try to drain your battery pack as fully as possible before it is charged for longest battery service.

  • The battery switch should be at ‘ON’ condition before charging.
  • Plug the power adapter into the mains supply power socket and then plug the charger connector into the power jack of the instrument. If the instrument is in power off condition, it will turn on automatically after the charger plug is inserted into the power jack. The battery symbol will alternately show betweenwhen charging. The darker part indicates battery nearing full capacity.
  • When the battery is fully charged, the battery symbol on the display will glint .
  • Please use the configured AC-DC adapter to charge the battery pack.

Battery Replacement

When the battery pack fails to charge, the user should replace the batteries.

  • Power down the instrument.
  • Take off the battery compartment cover and take out the battery pack.
  • Insert the connection plug of the new battery pack into the socket on the circuit board.
  • Reset the battery cover.
  • Turn on the instrument to check.

Connection of Data Transmission Cable

Insert one connection plug of the transmission cable into the USB socket on the right side of main body, and insert the another plug into the USB port on the back of computer box.

Servicing & Maintenance

Impact Device Servicing

After the impact device has been used 1000–2000 times, please use the nylon brush provided to clean the guide tube and impact body. When cleaning the guide tube, unscrew the support ring first, then take out the impact body, spiral the nylon brush in counter-clock direction into the bottom of guide tube and take it out for 5 times, and then install the impact body and support ring again.

  • Release the impact body after use.
  • Any lubricant is absolutely prohibited inside the impact device.

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