Linshang LS252DC Leeb Hardness Tester User Manual

Shenzhen Linshang Technology Co., Ltd.
LS252DC
Leeb Hardness Tester
User Manual V1.1

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

 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 dual coil technology for good repeatability and measurement 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 hardness scales, which can be converted between Leeb (HL), Vickers (HV), Brinell (HB), Shore (HS), Rockwell (HRA), Rockwell (HRB) and Rockwell (HRC). The instrument uses an impact device DC featuring a small size suitable for testing the hardness of some narrow spaces such as holes .

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

Parameters

HS(26.4-99.5); HRB(13.5-100); HRA(60-85.8)
Resolution| 1HL
Accuracy| ±6 HL
Repeatability| 6HL
Display| 128 ‘ 64 dot matrix OLED
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Power Supply| Rechargeable lithium battery 3.7V@250mAh, full charge for over 5000 continuous measurements
Charging Port| USB(Type-C)
Size| 883424 mm
Weight| 48g
Working Temperature Range| -10-50°C. 0-85%RH ( no condensation )
Storage Temperature Range| -10-60°C. 0-85%RH ( no condensation )

Features

1. The tester uses advanced dual coil technology for good repeatability and measurement accuracy.
2. Direction sensor inside the probe can automatically compensates for the measurement error of different impact directions.
3. Integrated handheld design, compact and portable
4. The instrument uses an impact device DC featuring a small size suitable for testing the hardness of some narrow spaces such as holes.
5.  Providing a variety of hardness scales to switch, no more tedious checking manually
6. Users can calibrate the standard parts to eliminate the error.
7. Low power consumption, and it can work continuously for more than 5000 times.

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.
   Long press the button to shut down the tester or the instrument will automatically shut down when the time without any operation is longer than 3 minutes.

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

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 five sub-options, press the briefly to select [Language, Material, Hardness, Unit, Calibration, Exit], short press the button to confirm the selection.
   
   • Language: Short press button to enter the language option and press button to select the right language, then press button to confirm your selection.
   
   • Material: Short press the button to enter the material selection interface, short press button to select the corresponding material, then press the button to confirm the option
   • Hardness Unit: Press the button briefly to enter the hardness unit selection interface, press the to select the hardness unit, press the button briefly to confirm.
   
   • Calibration: Short press the button to enter the calibration interface, the screen prompts [Please measure the standard hardness block] and flashes, then you can  easure 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. Long press the button to save the value, and the instrument indicates “Calibration succeed”, then exit to main menu interface. In addition, after entering the calibration interface, you can exit directly to the main menu interface by pressing the button when there is no standard hardness block to be measured, and the screen will show “Calibration Failed!”.
   
   • Exit: Short press button briefly to exit the main interface and enter the measurement interface.

4. View measurement records
   In the measurement mode, press button 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 will not lost when the instrument is turned off.
   In the history view mode or measurement mode, press button briefly and the screen will show a data deletion prompt, press button to select [Yes] to delete all recorded data and press the button to delete all record data.

 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.
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.
8. The battery needs to be charged regularly to prevent damage from excessive discharge especially there is no operation of the instrument over 6 months.

Packing list

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
3/12/2022

References

• Transmission Meter | UV Light Meter | Coating Thickness Gauge - Linshang

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