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MH310 Leeb Hardness Tester

Brand:

Mitech

Model:

MH310

Measuring range:

(170~960)HLD

Resolution Accuracy:

±6HLD,±1HRC,±5HB

Communication storage:

100 measurement series.(Relative to average times 32~1) USB1

Working time:

about 150 hours(with default brightness)

Main unit weight:

370g

Dimensions:

212*80*32mm

Package dimensions:

36.5*29*12.5cm

Total weight:

5.5kg

Product

  • Overview
  • Graphic
  • Technical
  • Configuration
  • Related

Product

  • Overview
  • Graphic
  • Technical
  • Configuration
  • Related
  • Product Overview

        MH310 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 clear ,stable performance. integrated high-speed thermal printer ,which can print on-site measurements. It is widely used in annealing, tempering, quenching , quality control for the work piece; hardness testing for machine tool and automobile chassis ; on-site hardness testing of in-service non-removable parts ; quality testing for hardware, forging, machine tools and special steels; quality control for batch production process and so on.Good quality and effective cost ,which is a wise choice for regular need of hardness testing . 

     

    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

     

    Working Principle

     The energy quotient is quoted in the hardness unit HL and is calculated from comparing the impact and rebound velocities of the impact body. It rebounds faster from harder samples than from softer ones, resulting in a greater energy quotient which is defined as 1000×Vr/ Vi.

    HL=1000×Vr/ Vi

    Where:

    HL— Leeb hardness value

    Vr — Rebound velocity of the impact body

           Vi — Impact 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

    Measuring range:(170960HLD

    Error and repeatability Impact device D  760±30HLD,±6 HLD

                                                                            530±40HLD,±10 HLD

                                             Impact device DC 760±30HLDC,±6HLDC

                                                                           530±40HLDC,±10HLDC

                                            Impact device DL  878±30HLDL,±12HLDL

                                                                           736±40HLDL,±12 HLDL

                                            Impact device D+15   766±30HLD+15,±12HLD+15

                                                                                544±40HLD+15,±12HLD+15

                                            Impact device G    590±40HLG,±12HLG

                                                                           500±40HLG,±12HLG

                                            Impact device C    822±30HLC,±12 HLC

                                                                          590±40HLC,±12 HLC

    Impact directionvertically downward, oblique, horizontal, oblique, vertical upward, automatically identify

    MaterialSteel and cast steel,Cold work tool steel,Stainless steel,Grey cast iron,Nodular cast iron,Cast aluminum 

                     alloys,BRASS(copper-zinc alloys),BRONZE(copper-aluminum/tin alloys),Wrought copper alloys

    Hardness ScaleHLHBHRBHRCHRAHVHS

    Paper roll: width (57.5 ± 0.5) mm, diameter: 30mm, long-term imports of paper to ensure long-term data storage

    DisplayHigh-contrast Segment LCD

    Integrated data memory100 measurement series.(Relative to average times 321)

    Battery:  6V( Ni-MH battery pack)

    Power supply:9V/500mA

    Recharge time:2.5-3.5hours

    Continuous operating periodabout 150 hourswith default brightness

    CommunicationUSB1.1

    Based on the principle of Leeb hardness testing theory. It can measure many metallic material

    One main unit can match to 6 impact devices

    Support Steel ,when using D/DC sensor to test steel,it can show HB directly,no need to check manually.

    High-contrast Segment LCD easy to use

    Software calibration automatically.

    100 groups (impact times 32 ~ 1) hardness measurements, each set of data includes single testing value, average value, measurement date / time, impact direction, frequency, material, hardness, and other information.

    Real-time display the remaining battery power, charging progress is displayed while charging.

    High brightness EL back-light display for easy use in dimly environment.

    Automatic sleep and shutdown and other power-saving features

    Integrated thermal printer with the instrument as a whole, and quiet operation, fast print speeds, you can print the test report on-site.

    Equipped with PC software (optional), with functions of measurements transmission , value storage management, statistical analysis of the measured value, the print report of measured value, batch setting instrument parameters , to meet the higher  requirements of quality for activities and management.

    Small size, portable, , stable and reliable performance, suitable for harsh environment field operations, prevent from vibration,  shock and electromagnetic interference.

    Dimension:212mm×80mm×32mm

     

    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 keynow 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.

    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)

    DDC

    3

    5

    DL

    3

    5

    D+15

    3

    5

    G

    4

    8

    E

    3

    5

    C

    2

    4


    5 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.

    6 Notification

    ---- 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.

    Instrument Maintenance