MITECH MH660 Portable Leeb Hardness Tester
MH660 portable Leeb hardness tester is Mitech latest upgrade model, it focuses on user experience and innovative features. Using 320 × 240 color LCD display, can also present a clear measurement results in dim light and strong sunlight environment , greatly enhance the visual experience; sealed metal case compact design, smaller, better quality, designed to withstand harsh field environment of the oil, dust ,more original point calibration function is used to do multi-point calibration for convert curve to reduce errors;during measurement instrument can automatically identify the measuring direction, automatically alarm when out of range, to meet the inspection requirements with high precision and multi-angle material collected, support free conversion between hardness type; low-power design powered by two AA batteries, support multiple languages.Blue-tooth printer. It is widely used in metal processing and manufacturing, special equipment or permanent component failure analysis in service, inspection and other fields. Particularly suitable for large non-removable part of the site hardness testing. It is to improve the pass rate of production and cost savings necessary professional precision instrument.
Function & application
- Die cavity of molds.
- Bearings and other parts.
- Failure analysis of pressure vessel, steam generator and other equipment.
- Heavy work piece.
- The installed machinery and permanently assembled parts.
- Testing surface of a small hollow space.
- Requirements of formal original record for test results.
- Material identification in the warehouse of metallic materials.
- Rapid testing in large range and multi-measuring areas for large-scale work piece.
The basic principle is to use an impact body of certain weight impacts against the testing surface under certain test force, then measure the impacting velocity and the rebounding velocity of the impact body respectively when the spherically test tip is located 1mm above the testing surface.
The calculation formula is as follows:
HL—— Leeb hardness value
VB—— Rebounding velocity of the impact body
VA—— Impacting velocity of the impact body
- Working temperature：- 10℃～＋50℃；
- Storage temperature：-30℃～＋60℃
- Relative humidity: ≤90％；
- The surrounding environment should avoid of vibration, strong magnetic field, corrosive medium and heavy dust.
Features MITECH MH660 Portable Leeb Hardness Tester
- Basic (single-point) calibration and multi-point calibration function for convert curve,to reduce the test error.
- Hardness scales can to convert to HL,HRB, HRC,HRA, HV,HS,
- Built-in Leeb hardness conversion function to converse HLD to HLC,HLG,HLDL,HLD+15,which is convenient for calibration and value conversion.
- Preset up and low limit of hardness value , it will alarm automatically if out of range alarm, convenient for batch testings.
- Chinese-English converting, menu operation, easy and convenient.
- It can store 500 groups (impact times 32 ~ 1) hardness values, each data includes single testing value, average value, measurement date / time, impact direction, frequency, material, hardness and other information.
- Two ordinary AA batteries, it can work for not less than 100 hours; automatic screen standby , automatic sleep, automatic shutdown and other power-saving features.
- With field-portable mini-printers with Bluetooth communication, convenient to generate data reports
- USB interface can do transmission measurements, value storage management, value statistical analysis ,printing the value report and batch setting the instrument parameters through the PC data-pro software, to meet the higher demand for quality sealed aluminum-magnesium alloy metal shell, compact, high portability, reliability, designed for harsh field environments, rugged, unique seal design allows it to resist wet , sand, dust, oil and other contaminants of harsh environments from the ocean to the desert
Operating Method and Attentions
– Insert the plug of the impact device into the socket of impact device on the instrument.
– Press the power key，now power is on. The instrument is in working mode.
Pushing the loading-tube downwards until contact is felt. Then allow it to slowly return to the starting position or using other method locking the impact body
Press the impact device supporting ring firmly on the surface of the sample, the impact direction should be vertical to the testing surface.
– Press the release button on the upside of the impact device to test. The sample and the impact device as well as the operator are all required to be stable now. The action direction should pass the axis of the impact device.
– Each measure area of the sample usually need 3 to 5 times of testing operation. The result data dispersion should not more than mean value±15HL.
– The distance between any two impact points or from the center of any impact point to the edge of testing sample should conform to the regulation of Table 4-1.
– If want accurate conversion from the Leeb hardness value to other hardness value, contrastive test is needed to get conversion relations for the special material. Use inspection qualified Leeb hardness tester and corresponding hardness tester to test at the same sample respectively. For each hardness value, each measure homogeneously 5 points of Leeb hardness value in the surrounding of more than three indentations which need conversion hardness, using Leeb hardness arithmetic average value and corresponding hardness average value as correlative value respectively, make individual hardness contrastive curve. Contrastive curve at least should include three group of correlative data.
|Type of Impact Device||Distance of center of the two indentations||Distance of center of the indentation to sample edge|
|Not less than (mm)||Not less than (mm)|
- Read Measured Value
After each impact operation, the LCD will display the current measured value, impact times plus one, the buzzer would alert a long howl if the measured value is not within the valid range. When reaching the presetting impact times, the buzzer will alert a long howl. After 2 seconds, the buzzer will alert a short howl, and display the mean measured value.
– Replacing the impact device must be done during Power off. Otherwise the main body could not identify the type of the impact device, and it may damage the circuit board of the main body.
– You could not save the current test value if the impact time is less than the presetting times value.
– Only type D and type DC of impact device have the function of strength test option. You can not change the setting to strength testing when using other types of impact device. The setting would be set to hardness testing automatically after replacing the impact device whether the setting is hardness testing or not before.
– Not all materials could convert to all hardness scale value. The hardness scale is reset to HL automatically after changing the material. So select material firstly before changing the hardness scale.
After the impact device has been used for 1000 to 2000 times, please use the nylon brush provided to clean the guide tube and the impact body. Follow these steps when cleaning the guide tube,
1.unscrew the support ring
2.take out the impact body
3.spiral the nylon brush in counterclockwise direction into the bottom of guide tube and take it out for 5 times
4.install the impact body and support ring when complete.
Release the impact body after use.
Any lubricant is prohibited inside the impact device.
Specifications MITECH MH660 Portable Leeb Hardness Tester
|Impact direction||vertically downward, oblique, horizontal, oblique, vertical upward, automatically identify|
|Error||D ±6 HLD|
|Repeatability||D 6 HLD|
|Material||Steel and cast steel,Cold work tool steel,Stainless steel,Grey cast iron,Nodular cast iron,Cast alu|
|Impact energe||D 11mJ|
|Impact weight||D 5.5g/7.2g|
|Impact ball hardness||D 1600HV|
|Impact ball diameter||D 3mm|
|Impact ball material||D—-Tungsten carbide|
|Sample surface roughness||D—-1.6μm；C—–≥0.2mm|
|Min depth of harness layer||D—-≥0.8mm；C—-0.4μm|
|Display||320 × 240 TFT LCD screen. information-rich, intuitive, clear display, adjustable brightness, easy t|
|Storage||It can store 500 groups (impact times 32 ~ 1) hardness values, each data includes single testing va|
|Calibration||calibration and multi-point calibration function|
|Data printing||With field-portable mini-printers with Bluetooth communication, convenient to generate data reports|
|Power voltage||3V,two (AA size alkaline batteries)|
|Power supply||Two ordinary AA batteries|
|Power consumption||Low-power design|
|Standby period||about 300 hours（with default brightness）|
|Commumication port||Blue tooth/USB1.1|
|Shell material||Chinese-English converting, menu operation, easy and convenient.|
|Dimensions||sealed aluminum-magnesium alloy metal shell|
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