LINSHANG LS253 Manuale utente

Shenzhen Linshang Technology Co., Ltd.

3/12/2022 Page 1 of 13

LS253

Leeb Hardness Tester

User Manual V1.0

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 can

connect with impact devices D, DL, DC and C.

Impact device D is suitable for assessing the hardness of common metal materials;

Impact device DL is suitable for hardness measurement of slender and narrow grooves, tooth

surfaces and the bottom of inner holes;

Impact device DC is suitable for testing the hardness of inner holes and narrow parts with short size;

Impact device C is ideal for measuring the hardness of surface hardening layers and parts with

small masses or thin thickness with small impact force.

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/ Impact device DC / Impact device DL/

Impact device C

Hardness Scales

HL, HV, HB, HS, HRA, HRB, HRC

Measurement Range

Impact device D/DC:

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)

Impact device DL:

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HLDL(170-960); HV(194-976); HB(140-651); HRC(19.8-

68.5); HS(26.4-99.5); HRB(59.6-99.6); HRA(60-85.5)

Impact device DL:

HLC(170-960); HV(80-996); HB(80-683); HRC(20-69.5);

HS(31.9-102.3)

Resolution

1HL

Accuracy

±12 HL, ±6 HL (typical)

Repeatability

6HL

Display

240 * 16 dot matrix LCD

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. Probe plug-in design, support different Leeb hardness tester impact devices.

2. 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.

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

directions.

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

5. 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.

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

average value of the last 9 measured values.

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

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8. It can print the measurement data after connecting Bluetooth printer.

9. Built-in Bluetooth function, it can connect to the mobile APP and realize measurement data sharing.

10. Low power consumption, powered by 2AA 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 instrument host and probe are

displayed on the screen at the same time after powering on, and then the instrument will enter the

measurement interface and the measured values before powering off are displayed.

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

Impact device D/DL/C:

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.

Impact device DC:

Loading:

Push the impact body from the bottom to the locking position with the push rod.

Positioning:

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

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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

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.

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(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

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

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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

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

(7) Power off

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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. Aviation plug connection

When plugging out the probe, make sure not to violently rotate and pull the connector, but plug out the

plug by the way as shown in the following diagram.

V. Bluetooth printing function

The instrument has built-in Bluetooth communication module, which can be connected to Bluetooth

printer to print measurement data. Turn the DIP switch on the side of the Bluetooth printer to [ON], and

long press the power button to turn it on. Short press , the printer icon will be displayed on the

screen, and the [BLUETOOTH] blue indicator on the printer will be on continuously indicating successful

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connection and the printer will print the current measurement results. If the device is connected to the

mobile APP, it will prompt whether to disconnect theAPP connection. Select [Yes] to disconnect theAPP

and connect the printer.

Note: The instrument can only be connected with the Bluetooth printer provided by the manufacturer,

other brands of printers are not guaranteed to be connected successfully.

VI. APP function

1. APP installation

APP supportsAndroid operating system 7.0 and above, choose one of the following methods to install:

(1) Use a mobile browser or WeChat to scan the QR code on the cover, follow the prompts to download

and install the APP.

(2) Search for "UT and HL" from the Google Play application market, download and install theAPP as

prompted.

APP icon

Precautions:

During installation or after installation for the first time open theAPP, mobile phone will prompt

permissions Settings, the customer should be all set to allow, can appear otherwise APP can't search to

the device, will not be able to use the APP.

2. Device Connection

Start the instrument, open the APP software, the LOGO interface will be displayed first. After the LOGO

is displayed for 3 seconds, the Bluetooth interface is entered if there is no bound Bluetooth device. Click

"Start searching", the prompt " searching for device..." , and list the available Bluetooth devices found;

Click the "Stop searching" button to stop searching for Bluetooth devices. Click the device that matches

the SN of the instrument and wait for the device to connect.After the connection is successful, it will

jump to the "Measure" interface. If the instrument is connected to the Bluetooth printer, it will prompt

whether to disconnect the printer, select [Yes] to disconnect the printer and connect the APP.

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Bluetooth interface

If the APP already has a bound Bluetooth device, the logo interface will stay for 3 seconds and

automatically search for and connect the bound Bluetooth device. After successful connection, the app

will automatically enter the "Measurement" interface.

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