RFGGJNHKJUSWETGBVN Pen Type Portable Leeb Hardness Tester

1. Introduction

The RFGGJNHKJUSWETGBVN Pen Type Portable Leeb Hardness Tester is a compact and versatile instrument designed for measuring the hardness of various metallic materials. It provides accurate readings across multiple hardness scales, including HRC, Hra, Hrb, HB, HL, Hv, and HS.

This device is suitable for a wide range of applications, including:

• Testing die cavities of molds.
• Assessing the hardness of bearings and other mechanical parts.
• Failure analysis of pressure vessels, steam generators, and similar equipment.
• Measuring heavy workpieces.
• Inspecting installed machinery and permanently assembled components.
• Testing surfaces within small hollow spaces.
• Material identification in metallic material warehouses.
• Rapid testing across large ranges and multiple measuring areas for large-scale workpieces.

Figure 1: RFGGJNHKJUSWETGBVN Pen Type Portable Leeb Hardness Testers (Blue and Black models).

2. Setup

2.1 Unboxing and Initial Inspection

Carefully remove the hardness tester and all accessories from its packaging. Inspect the device for any visible damage. Ensure all components listed in the packing list are present.

Figure 2: Hardness Tester with Carrying Case and Accessories.

2.2 Powering On

Locate the power button (typically marked with a power symbol ⏻) on the device. Press and hold the button until the display illuminates.

2.3 Initial Calibration

Calibration is crucial for accurate measurements. The procedure varies slightly depending on whether your device model includes physical keys for navigation.

2.3.1 Calibration for Models with Keys

1. Press the ▲ Up and ▼ Down keys to adjust the displayed measurement to the nominal value of your standard hardness block.
2. Press the Menu key to complete the calibration process.

2.3.2 Calibration for Models Without Keys

For models without physical navigation keys, the calibration process is automated:

• Perform five consecutive measurements on an empty (unmeasured) surface. The measured value will decrease by 1 each time.
• Next, perform measurements on a workpiece or a standard hardness block. The measured value will increase by 1 each time.
• Once the displayed value matches the nominal value, no further operation is required. The device will automatically calibrate after 5 seconds.

The calibration range is approximately ±15 HL.

Figure 3: Device Display and Control Buttons.

3. Operating Instructions

3.1 Preparing the Sample

Ensure the surface of the material to be tested is clean, smooth, and free from oil, rust, or other contaminants. The sample should be stable and thick enough to prevent deformation during testing.

3.2 Performing a Measurement

1. Hold the hardness tester firmly and perpendicular to the test surface.
2. Press the impact device against the surface. The internal spring mechanism will release, causing an impact.
3. The hardness value will be displayed on the screen.
4. Repeat measurements at several different points on the sample to ensure accuracy and consistency. Avoid re-testing the exact same spot.

Figure 4: Side View of the Hardness Tester.

3.3 Understanding Hardness Scales

The device can display hardness values in various scales. Refer to the device's menu or settings to select the desired scale (e.g., HL, HRC, HB). The displayed value corresponds to the selected hardness scale.

4. Maintenance

4.1 Cleaning

Regularly clean the device with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure the impact device tip is free from debris.

4.2 Storage

When not in use, store the hardness tester in its protective carrying case in a dry, dust-free environment, away from extreme temperatures and direct sunlight.

4.3 Recalibration

Periodic recalibration using a standard hardness block is recommended to maintain measurement accuracy, especially after prolonged use or if inconsistent readings are observed.

5. Troubleshooting

5.1 Measurement Error or Large Repeatability Value

If the measurement error or repeatability value is excessively large, it indicates a need for recalibration. Use an available standard hardness block (optional accessory) to calibrate the instrument and impact device.

5.1.1 Software Calibration (Models with Keys)

1. Press the Menu button to enter the menu.
2. Use the ▲ Up and ▼ Down keys to select 'Software Calibration'.
3. Press the Menu button again to enter the calibration status. Follow on-screen prompts to complete.

5.1.2 Calibration (Models Without Keys)

Perform five consecutive measurements on an empty surface to enter the calibration status. Then proceed with measurements on a standard hardness block as described in Section 2.3.2.

5.2 General Inaccuracies

• Ensure the test surface is clean and smooth.
• Verify the sample material is stable and adequately supported.
• Confirm the impact device is perpendicular to the test surface during measurement.
• Check battery level; low battery can affect performance.

6. Specifications

7. Warranty & Support

Specific warranty information for this product is not available in the provided documentation. Please refer to your purchase receipt or contact the seller directly for details regarding warranty coverage and technical support.

For any operational issues or technical inquiries not covered in this manual, please reach out to the manufacturer or authorized service center.