Pen Type Hardness Tester

1. Summarize

The instrument is a kind of portable measuring instrument; it can be quickly, nondestructive and high accuracy when measuring common metal materials hardness. It can be used in the laboratory, as well as the on-site engineering field. It can meet the needs of a variety of measurement through instrument measuring conditions setting. The instrument can be widely used in manufacturing, metal processing industry, chemical industry, commodities inspection, and etc. It is indispensable for material nondestructive hardness testing.

This instrument meets the following criteria:

——JJG 747-1999 Leeb Hardness Tester

——ASTM A956-06Standard Test Method for Leeb Hardness Testing of Steel Products

Feature：

• Intelligent simple

No key "fool" type operation, directly shows the most commonly used on the Leeb scale and Rockwell values

• Small and portable

Small, portable instrument, integrated design without connecting cables, improves the reliability

• Industry highlights, OLED display

Canclear display under direct sunlight, suitable for all kinds of lighting conditions

• Born colorful

Self-expression with uniquecolors, show the unique personality

• AccurateMeasurement

High precision of measurement circuit guaranteevalue error for ±0.5%(HLD=800), value repeatability for 0.8%

• Support for multiple hardness standard

HL、HV、HRA、HRC、HRB、HB、HS

• Massive capacity data storage

The unprecedented mass storageleads the technology trend. It can save 270 group hardness measurementsdata, each group including average,hardness standard .

• Support ‘forged Steel’ material

When impact type D device test sample "forged steel,"it can be read directly HB values, without manual look-up table.Hardness value is preset upper and lower limit, automatic alarm beyond the scope, convenient for the user batch testing.

• Charge as you want

USB charging, compatible with most cell phones and other digital product interface

Note: The above features are associated with the model; please refer to the appendix behind.

1.1 Measuring Principle

A predeterminedmassoftheforce ofthe impact body, the impactsurface of the sampleat a constant speed, with the punch1mmaway from thesample surfaceat theimpact velocityandrebound velocitycalculated from the ratiohardness value.Calculated as follows：

HL=1000×VB/ VA

HL——Leeb Hardness

VB——The speed of rebound

VA——Impacting Speed of impact body

Impact deviceoutput signalSchematic diagram is as follows:

1.3 Standard Package

1.3 The appearance and display instrument

1.4 Screen display

The instrument will automatically enter the main display after boot, as shown below:

Hardness standard: or shows current hardness standard

Average value：

Direction:

Battery storage:

1.5 Key definitions

1.6 Technical parameters

•     Value error and repeatability

2. Operation of the machine

2.1 Specimen preparation

• In the process of preparing the sample surface, should be avoided due to heat, cold, etc. on the sample surface hardness.

• It will cause measurement errors if measured surface is too rough. Therefore, the test specimen surface must be exposed metallic luster and smooth, without oil.

• Surfaces: Test specimen surface is best plane. Measured surface radius of curvature R less than 30mm should be used in the test sample small support ring or ring-shaped support.

• Specimen support

- For heavy samples, with no needfor support;

- Medium-sized specimen must be placed in a flat, hard, flat surface, placing the sample must be absolutely smooth, without any shaking;

• Sample should be of sufficient thickness, the minimum thickness of the specimen shall conform to Table 

• For samples with surface hardened layer, hardening layer depth shall comply with Table 

• Coupling

- For light specimens must be sturdy supporting body tightly coupled, two coupling surfaces must be smooth, not too much amount of coupling agent, the test must be perpendicular to the direction of coupling plane;

- When a sample was a big plate, pole, bending parts, even weight, thickness, may still cause large specimen deformation and instability, resulting in test values are not allowed, it should be back at the test point reinforced or supported.

• Sample itself should be less than 30 gauss magnetic

2.2 Measurement

• Start

-Type without keys: Push down load impact set of lock body, push the upper part of the impact device release button, the instrument self test and enter the measurement mode.

-Type with keys: Press [ON / OFF] key, then the power is turned on, the instrument enters measurement mode after self test.

• Load

-Push down load impact set of lock body, completes the loading at this time.

-Put impact device supporting ring compression on the sample surface, direction of impact should be vertical with the test surface.

• Measure

-Press the upper part of the impact device release button for testing. Samples, impact device, the operator should be stableat this time, and the force direction should be through the axis of the impact device.

- Each monitoring site should be tested three times in general.

- Read the measured average value, as a hardness test data on the Leebstandard.

• Power off

- If no operation for a period of time, the instrument will turn offautomatically.

-Type with keys: press "on/off" key, the instrument will turn off.

• Distance between any two indentation or any indentation center distance sample edge distance should comply with the regulations of the table below.

• Hardness standard setting(type with keys)

- According to the applicable range, select the hardness standard, then measure.

2.3 Menu map (Type with keys)

Setting and additional functions can be realized through the instrument parameters menu operation, in the main display screen press [menu] button to enter the main menu.

2.4 Charge

This machine adopts the rechargeable lithium battery, when the battery voltage is too low, please charge it in time, and the selection of random with the charging head andUSB charging cable.

When the battery voltage is too low, the instrument will automatically shut down.

Whether or not the boot, charger connected can be charged, the charging headindicator light

3. Calibration of the instrument

If measurement error and repeatability value is too large, the available Leeb standard hardness block (optional) calibration on instruments and impact device.

• Enter the calibration menu, as shown in the form below

-Type with keys: press 【menu】button to enter the menu, press 【up down】choice ‘software calibration’, press 【menu】button to enter the calibration status.

-Type without keys: the empty measured five times in a row, can enter the calibration status.

• Calibration measurement

- On the magnitude of the hardness block vertical downward average value measurement random measured at five dots.

• According to the Leeb standard hardness block of the nominal value adjust measuring values

-Type with keys: press 【up down】 key to adjust measurements to the nominal value, press 【menu】key to complete the calibration.

-Type without keys: on measured empty time value will minus 1, the workpiece or hardness block measurement will be measured value add 1 at a time, after the adjustment to the nominal value, no need to do any operation, automatic calibration after 5 seconds.

• Calibration range of plus or minus 15 hl.

4. Maintenance and repair

4.1 Impact device

• After the use of 1000 - 2000 times, clean up catheter and impact devicewithnylon brush, cleanthe catheter when the first supporting ring rotation, then theimpact body removal, nylon brush to counterclockwise screwed pipe, the end of pull out, repeat 5 times, and then arrangeon the impact body and the support ring;

• After use, should release the impact body;

• Impact device is strictly prohibited the use of various lubricants.

4.2 The normal repair process

• As for verification of Rockwell hardness standard block, errors are larger than the 2HRC, may be a ball head wear failure, and should consider replacing the ball or the impact body.

• When the hardness tester shows other abnormal phenomenon, please do not disassemble or adjustany fixed assembly parts, complete the warranty card and send it to our company maintenance department, perform warranty regulations. The instrument stay in our company is generally not more than a week.

4.3 Non warranty parts list

4.4 Storage conditions

• The device should be stored away from vibration, strong magnetic field, the corrosive medium, moisture, dust, should be stored at room temperature.

• In the original packaging - transport guarantee condition, can be carried out in thetertiary highways conditions.

5. Appendix