Measuring range：（170～960）HLD

Resolution Accuracy：±6HLD

Communication storage：100 measurement series.(Relative to average times 32～1) US

Working time：about 100 hours（with default brightness）

Main unit weight：245g

Total weight：4.0KG

Dimensions：150mm×74mm×32 mm

Related standards：


 Product Overview
 
MH180 portable Leeb hardness tester, based on Leeb hardness measuring principle, quick and easy,on-site test the hardness of series metal materials, support free conversion between Leeb, Brinell, Rockwell hardness scale and others,It uses high-contrast  segment LCD to display , small size, light,portable, stable and reliable performance.It is widely used in failure analysis of metal processing and manufacturing, special equipment, permanent assembly, inspection and other fields.It can meet the regular hardness testing of industrial production , quality and cheap, which is the first choice for practical and economical models.
 
Function & application
 
Die cavity of molds
Bearings and other parts
Failure analysis of pressure vessel, steam generator and other equipment
Heavy　
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
Working Principle
 
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=1000×VB/ VA
 
Where:   HL—— Leeb hardness value
VB—— Rebounding velocity of the impact body
VA—— Impacting velocity of the impact body
 
Working Conditions
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. 
 
 
Instrument Features
 
 
Surface temperature can’t be overheat, less than 120 ℃.
Surface roughness should not be too large, otherwise it will cause errors. The surface of the work piece must be exposed metallic luster, smoothing and polish, without oil.
 
The specimens with 2-5kg or thin-walled specimens overhangs should be supported with some object in order to avoid the pecimen deformation ,bending and movement caused by impact , for medium-sizedwork piece ,it shall be placed on a flat and hard surface, the sample must be placed absolutely smoothly, without any shake, for heavy samples more than 5kg, it can be measured directly without any support
 
 Portable Leeb hardness tester has strict requirements for sample thickness , the minimum thickness shall comply with regulatory  (see instructions).
 
For work piece with hardened layer on surface,the depth of hardened layer should conform to regulatory..
 
For lighter parts,please make it tightly coupled with support, two coupled surface must be flat and smooth, the coupling gel should not be too much, the direction of the test shall be perpendicular to the coupling plate; if the work piece is a large plate, pole or bending material, even if the weight and thickness is ok ,it may still cause deformation and instability, resulting in test values error, it should be reinforced or supported at the back of the test points.
 
Magnetic of work piece should be less than 30 gauss.
 
Operating Method and Attentions
1 Start-Up
---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.
 
2 Loading
 
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.
3 Localization
 
Press the impact device supporting ring firmly on the surface of the sample, the impact direction should be vertical to the testing surface.
 
4 Testing
----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.