LINSHANG LS251D User manual

Shenzhen Linshang Technology Co., Ltd.

3/12/2022 Page 1 of 8

LS251D

Leeb Hardness Tester

User Manual V1.3

Please read this manual carefully before using and reserve it for reference.

Shenzhen Linshang Technology Co., Ltd.

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I. Product Introduction

The Leeb hardness tester detects hardness based on the Leeb hardness measurement principle and

can measure the hardness of a variety of metal materials. The tester adopts advanced digital probe

technology, digital signal processing is done directly on the probe, which is not easily disturbed and

provides excellent testing accuracy. The probe has a built-in direction sensor, which automatically

compensates for the measurement error in different impact directions. The instrument has a variety of

built-in hardness systems, which can be converted between Leeb (HL), Vickers (HV), Brinell (HB), Shore

(HS), Rockwell (HRA), Rockwell (HRB), Rockwell (HRC) and tensile strength (σb). The instrument

adopts an impact device D suitable for assessing the hardness of common metal materials.

Standards for the product:

 GB/T 13794.1 Metallic materials-Leeb hardness test-Part 1: Test method

 GB/T 13794.2 Metallic materials-Leeb hardness test-Part 2: Verification and calibration of

hardness tester

 GB/T 13794.2 Metallic materials-Leeb hardness test-Part 3: Calibration of reference blocks

 GB/T 13794.4 Metallic materials-Leeb hardness test-Part 4: Tables of hardness values conversion

 JB/T 9378-2001 Industry standard of Leeb hardness tester

 JJG 747-1999 Verification regulation of Leeb hardness tester

II. Parameters

Probe Impact device D

Hardness Scales HL, HV, HB, HS, HRA, HRB, 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)

Resolution 1HL

Accuracy ±6 HL

Repeatability 6HL

Display 240 * 16 dot matrix LCD

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Power Supply 2 AA alkaline dry batteries

Host Size 142*72*28 mm

Probe Size 148*31*25 mm

Weight 247g

Working Temperature Range -10~50℃，0~85%RH（no condensation）

Storage Temperature Range -10~60℃，0~85%RH（no condensation）

III. Features

1. The tester uses advanced digital probe technology, digital signal processing directly on the probe to

complete, which is not easy to interfere with and provides excellent test accuracy.

2. Built-in direction sensor, automatically compensates for the measurement error of different impact

directions.

3. Providing a variety of hardness scales to switch, no more tedious manual check table

4. QC inspection, the tester can set upper and lower limits to determine whether the incoming material

is qualified and achieve rapid detection of incoming material.

5. Statistics function, the tester can automatically count the maximum value, minimum value, and

average value of the last 9 measured values.

6. Users can calibrate the standard parts to eliminate the error.

7. Low power consumption, powered by 2 AA alkaline batteries and it can work continuously for more

than 100 hours.

IV. Operation

1. Power on/off

Power on:

Short press button, the version and the serial number of the tester are displayed on the screen after

powering on, and then the instrument will enter the measurement interface and the measured values

before powering off are displayed.

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Power off:

Long press the button to shut down the tester or click the “Shutdown” option in the menu, the

instrument will automatically shut down when the time without any operation is longer than the auto-

shutdown time.

2. Measurement

Loading:

Push down the loading sleeve of the probe to lock the impact body.

Positioning:

Press the probe firmly against the surface of the object to be measured and keep it still.

Measurement:

Press the release button on the top of the probe to measure the hardness of the object.

There are two measurement modes:

(1) Statistics mode

The interface of statistics mode is shown below (left). The instrument displays the maximum value,

minimum value, and average value of current statistics as well as the number of valid data. The

number of statistics is the last 9 valid measurement data, and when there are less than 9 data, the

actual amount of data prevails.

(2) QC mode

The QC mode interface is shown in the figure below (right), and the instrument judges whether the

measured value is qualified according to the set upper and lower limits.

Statistics mode QC mode

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3. Setup and Calibration

Press and hold the button for 3 seconds in the off state or press the button briefly in the

measurement state to enter the Main Menu of the instrument with seven sub-options, press the and

briefly to select [System Setup, Hardness/Strength, Material, Hardness, Calibration, Exit, Shutdown], short

press the button to confirm the selection.

(1) System Setup

 Language: Short press button or button to enter the language option and press the or

button to select the right language, then press button to confirm your selection.

 Auto power off: short press the button or button to enter the shutdown time selection, short

press the or button to select the shutdown time, short press the button to confirm.

 Mode selection: short press the button or button to enter the mode selection interface,

press button to select the measurement mode, then short press the button to confirm.

 Limit setting: Limit setting is only displayed in QC mode, short press the or button to enter

the limit setting interface, press or button to select [upper/lower limit/return] option, short press

the to confirm your option, short press to modify the value, finally, short press the

button to confirm the whole setting.

 Restore factory settings: Press the button briefly to enter the restore factory selection interface.

button can toggle the [Yes/No] option, press the button briefly to confirm

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the option and return to the setting interface.

(2) Hardness/Strength

Short press button to enter hardness/strength selection interface, and short press the or

button to select [hardness/strength], then short press the button to confirm the selection.

(3) Material

Short press the button to enter the material selection interface, short press the button

to select the corresponding material, then press the button to confirm the option and return to the

setting interface.

(4) Hardness Unit

The hardness unit is only displayed in hardness measurement mode, press the button briefly to enter

the hardness unit selection interface, press the or to select the hardness unit, press the

button briefly to confirm.

(5) Calibration

Short press the button to enter the calibration interface, the screen prompts [Please measure the

standard hardness block] and flashes, then you can measure the standard hardness block (single or

multiple times). After measurement, the cursor moves to the actual value area, then press or button

to adjust the actual value to the standard value of the hardness block. Short press the button to end

the adjustment, and press the or to select [Cancel]/[Back]/[Save] options.

 Select [Cancel] and press button briefly to return to the calibration screen and wait for the

measurement again.

 Select [Back], short press button to not save the calibration data and exit the calibration screen.

 Select [Save], press button briefly to save the current calibration data, and exit the calibration

interface.

(6) Exit

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Short press button briefly to exit the main interface and enter the measurement interface.

(7) Power off

Short press button to power off the instrument.

4. History Records

In the measurement mode, press or briefly to view the historical data in the browse interface. The

instrument stores 9 sets of data totally, and the oldest recorded value is automatically deleted when there

are more than 9 sets of data. Record 1 is the earliest test data, and so on backward. Recorded data is not

lost when the instrument is turned off.

When pressing button to view the data, the data record number is increasing from the first one to the

last one; when pressing button to view the data, the data record number decreases from the maximum

to the minimum.

In the history view mode or measurement mode, press button briefly and the screen will show a data

deletion prompt, press button briefly to select [Yes] to delete all recorded data.

5. Quick access to the calibration interface

In measurement mode, short press the button to check historical data. The gauge stores 9 sets of data.

When more than 9 sets of data are stored, the earliest recorded value is automatically deleted, and “No.1”

is the last test data. Recorded data will not be lost after powering off.

V. Attentions

1. The surface of the test object shall not be too rough， and it needs to be flat, smooth, free of oil and

grease, transmitting a metallic luster.

2. The minimum mass of the test object is 5Kg, and the minimum thickness is 25mm. For objects whose

weight and thickness do not meet the requirements, the test must be coupled with solid bracing.

3. The maintenance of the impact device. After using the device about 1000-2000 times, the user needs

to use a nylon brush to clean the instrument's conduit and impact body. When cleaning, the user needs

to unscrew the support ring of the catheter first, then remove the impact body, insert the nylon brush

into the catheter in a counterclockwise direction, then pull out the bottom and repeat five times, and

finally put the impact body and support ring.

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4. After use, the impact body should be loosened.

5. The use of various lubricants is strictly prohibited in the impact device.

6. When measuring, the distance between any two indentations should not be less than 3mm, and the

distance between the center of the indentation and the edge of the object to be measured should not

be less than 5mm.

7. When the device displays “Low Battery”, batteries should be replaced.

VI. Packing list

No. Product Name Quantity Unit

1 Leeb Hardness Tester 1 Set

2 Standard Leeb hardness block 1 pcs

3 Nylon Brush 1 pcs

4 Small support ring 1 pcs

5 1.5V AA alkaline battery 2 pcs

6 User Manual 1 pcs

7 Certificate / Warranty card 1 pcs

VII. Service

1. The gauge has one-year warranty. If the gauge works abnormally, please send the whole gauge to

our company for maintenance.

2. Provide users with spare parts and lifelong maintenance services.

3. Provide the users with the gauge calibration service.

4. Free technical support for the long term.

Manufacturer: Shenzhen Linshang Technology Co., Ltd.

Website: www.linshangtech.com

Service hotline: +86-755-86263411

Email: sales21@linshangtech.com

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