MH100 Leeb Hardness Tester User`s Manual
Contents
1. fire or even explosion Do not cast the battery pack into fire and do not short circuit disassemble or heat the battery pack otherwise battery leakage fire or even explosion may occur 2 Structure Feature amp Testing Principle 2 1 Structure Feature 2 1 1 The Hardness Tester Appearance 4 1 LCD display 2 Main unit 3 Socketof USB 4 Impact device 5 Battery compartment cover 6 Product label 7 Keypad 2 1 2 D Type Impact Device 1 2 3 4 5 6 oe 1 Support ring 2 Impact body 3 Coil unit 4 Guide tube 5 Loading tube 6 Release button 2 1 3 Different Types of Impact Device The instrument has three types type D type C and type DL depending on different impact device Please refer to Table 1 and Table 3 for details 2 2 Main Screen Below is the main display screen Battery Info Measured Value Hardness Scale Impact Times Direction Material No Instruction of the Main Display Screen Material The present presetting material Impact direction The present impact direction Hardness scale Hardness scale of the present measured value Battery information Showing the rest capacity of the battery and the charging status Measured value Display present single time measured value without showing average icon or display the present mean value with average icon prompting HI means over conversion v2. Cr V steel 500 750 704 1980 5 Cr Ni steel 500 750 763 2007 6 Cr Mo steel 500 738 721 1875 7 Cr Ni Mo steel 540 738 844 1933 8 Cr Mn Si steel 500 750 7557 1993 9 Super strength steel 630 800 1180 2652 10 Stainless steel 500 710 703 1676 26 Table 3 Type of impact device D DL C Impacting energy 11mJ 2 7mJ Mass of impact body 5 5g 7 2g 3 0g Test tip hardness 1600HV 1600HV Dia Test tip 3mm 3mm Material of test tip Tungsten carbide Tungsten carbide Impact device diameter 20mm 20mm Impact device length 86 147 75mm 141mm Impact device weight 50g 75g Max hardness of sample 940HV 1000HV Mean roughness value of sample 1 6um 0 4um surface Ra Min weight of sample Measure directly gt 5kg gt 1 5kg Need support firmly 2 5kg 0 5 1 5kg Need coupling tightly 0 05 2kg 0 02 0 5kg Min thickness of sample Coupling tightly 5mm Imm Min layer thickness for surface hardening 20 8mm 20 2mm Size of tip indentation Hardness Indentation 0 54mm 0 38mm 300HV diameter Depth of 24um 12um indentation Hardness Indentation 0 54mm 0 32mm 600HV diameter Depth of 17um Sum indentation ERYRI Hardness Indentation 0 35mm 0 35mm 800HV diameter 27 Depth of indentation 10um 7um Available type of impact device DC Test holeor C Test hollow small light cylindrical thin parts and DL Testslender surface of narrow groove
3. by pressing the key while it is working The tool has a special memory that retains all of its settings even when the power is off Note If the instrument is in power off condition it will turns on automatically after the charge power is connected 5 2 Material Setting Short press Fl key several times to select MTL option Then short press F2 to change the material to the one you want to set Hardness scale recovers to HL automatically after material setting is changed Please select material firstly then select hardness scale In hardness testing mode you can select the material among the following materials Steel and Cast Steel Cold Work Tool Steel Stainless Steel Gray Cast Iron Nodular Cast Iron Cast Aluminum Alloys Copper Zinc Alloys Copper Aluminum Alloys Wrought Copper and Wrought Steel The relationship between the material index number displayed on the instrument screen and the material is 17 as follows TABLE 5 1 Index MATERIAL Index MATERIAL 0 Steel and cast steel 5 Cast aluminum alloys 1 Cold work tool steel 6 Copper Zinc alloys 2 Stainless steel 7 Copper Aluminum alloys 3 Gray cast iron 8 Wrought copper 4 Nodular cast iron 9 Wrought steel In strength testing mode the following materials are selectable Mild Steel High Carbon Steel Cr Steel Cr V Steel Cr Ni Steel Cr Mo Steel Cr Ni Mo Steel Cr Mn Si Steel Super Strength Steel and Stainless Steel The relations
4. data logging function The memory icon will appear It will display the current file name the test parameter of the group data and the mean value of the group If there is no data in the memory it will display lt E04 gt which means no memory data and then return back Short press F1 and F2 to scroll to the file that will be deleted Long press F2 on the desired file It will automatically delete the file and display DEL Note Do not shut down the instrument while deleting data It could lead to unpredicted consequence if shutting down while deleting 20 5 9 System Reset Press down F2 while powering on the instrument will restore factory defaults The only time this might possibly helpful is if the parameter in the instrument was somehow corrupted 5 10 EL Backlight With the EL background light it is convenient to work in the dark condition Pressing any key will switch on the background light at any moment after powering on Since the EL light will consume much power turn on it only when necessary The EL background light will be automatically switched off when the instrument lasts three seconds of no key or testing operation 5 11 Auto Powering Off The instrument features an auto powering off function designed to conserve battery life If the tool is idle neither measuring nor any key operation for 5 minutes it will turn itself off Before powering off the LCD display of the instrument will continue flashin
5. or hardened hole layer Table 4 No Type Sketch Remarks 1 710 15 For testing cylindrical outside surface R10 R15 2 714 5 30 For testing cylindrical outside surface R14 5 R30 3 Z25 50 For testing cylindrical outside surface R25 R50 4 HZ1 1 13 For testing cylindrical inside surface R11 R13 HZ12 5 17 Q ni For testing ie cylindrical inside surface R12 5 R17 6 HZ16 5 30 For testing cylindrical inside surface R16 5 R30 K10 15 For testing spherical 7 outside surface SR10 SR15 28 K14 5 30 For testing spherical outside surface SR14 5 SR30 HK11 13 10 HK12 5 17 11 HK16 5 30 For testing spherical inside surface SR11 SR13 For testing spherical inside surface SR12 5 SR17 For testing spherical inside surface SRI6 5 SR30 12 UN For testing cylindrical outside surface radius adjustable R10 29 Mitech CO LTD Address Room E506B YingChuangDongLi Park 1 of ShangDi East Road Haidian District Beijing China Tel 86 10 51284068 Fax 86 10 58859527 PC 100085 Web www mitech ndt com 30
6. or using other method locking the impact body 4 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 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 14 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 groups of correlative data
7. MH100 Leeb Hardness Tester User s Manual T ON MITecH Mitech CO LTD OVERVIEW 4 Me ee Ge Ee dota hee apes eco dd ALE a 3 LET Advantages 4c A ne et e e e 3 1 2 Main Application amp Testing Range esee 4 1 2 1 Main Application esee eene 4 I 2 2 Testing Range A ERR eae potas 4 1 3 Technical Specifications eene 3 1 4 Configuration p ete er iere et dee 6 1 5 Working Conditions eese 6 1 6 Safety Instructions eese rennen nennen 7 2 STRUCTURE FEATURE amp TESTING PRINCIPLE esee 8 2 I Structure AU N EE RO EE EE N amp 2 1 1 The Hardness Tester Appearance esse 8 2 1 2 D Type Impact Device essere amp 2 1 3 Different Types of Impact Device sss 9 2 2 Main SCfeen i edi ate et t ete Ph 9 2 3 Keypad Definitions eese enne 10 2 4 Leeb Hardness Testing Principle esses 10 S PREPARATION EE hi RED EPOD REA Eo Prts 11 3 1 Instrument Preparation and Inspection eese 11 3 2 Preparation of the Sample Surface sess 12 4 TESTING PROGRAM Alseen ero ee ee eke ge ER ne een n eere 14 AL Starts Upon dieta ti rte N RE Sova eneen 14 4 2 LOdihg 2 see e aee mda iei Huan 14 ERROR AE N oe ere dia 14 FEA TO STUNG AE Lm 14 4 5 Read Measured Value eee 16 4 6 Notification OE EE AE EES 16 5 OPERATION DETAIL va s
8. Table 4 1 Type of Distance of center of Distance of center of Impact the two indentations the indentation to Device sample edge Not less than mm Not less than mm D 3 5 DL 3 5 C 2 4 15 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 4 6 Notification You could not save the current test value if the impact time is less than the presetting times value Only type D of the impact device has the function of strength test option You can not change the setting to strength testing when using the instrument with other types of impact device 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 5 Operation Detail 5 1 Power On Off Press 9 to turn on the instrument The system would automatically detect the type of the impact device during power up and would display this information on the screen After pausing for several second the screen will exit and enter the main display screen as following The instrument can be turned off
9. alue or 9 measure range LO means lower than conversion value or measure range Impact times Times that have been impacted Average Icon It will appear when showing the mean value of the measured values after reaching the presetting impact times Memory Icon It appears when operating the instrument memory 2 3 Keypad Definitions The instrument has three keys 0 F1 and F2 Key Turning on off the instrument Key F1 and F2 Selecting or modifying the instrument parameters Key actions Short press Press on a key lasting for not more than one second Long press Press on a key lasting for more than one second 2 4 Leeb Hardness Testing 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 1000xVB VA Where HL Leeb hardness value VB Rebounding velocity of the impact body VA Impacting velocity of the impact body 3 Preparation 3 1 Instrument Preparation and Inspection Verification of the instrument is by using standard test block The error and repeatability of displayed value should be within the regulation of Appendix table 2 The instrument and impact device must be calibrated using a standard hardness blo
10. ck before use as the first time or having not been used for a long time or having reset the instrument system Press key meanwhile pressing down the Fl key to power on the system Then the user calibration screen shows as right E nal ES A a Test for 5 points on the standard hardness block It would display the average measured value after measuring 5 times Short press F1 to increase or F2 to decrease the digit to its nominal value Long press F1 to confirm the calibration finally Or long press F2 to cancel the calibration Range of adjustment 30HL The measurement parameters including the material setting the hardness scale and the impact direction can t be changed during calibration Note Use a calibrated hardness tester test the standard test block downward vertically for 5 times the arithmetical average value compare with the value of standard test block If this value exceeds the standard value could use the function of user calibration to adjust 3 2 Preparation of the Sample Surface Preparation for sample surface should conform to the relative requirement in Appendix Table 3 In the preparation processing for sample surface the hardness effect of being heated or cold processing on the surface of sample should be avoided Too big roughness of the being measured surface could cause error So the surface of the sample to be measured must appear metallic luster smoothing an
11. d light Test at any angle even upside down Direct display of hardness scales HRB HRC HRA HV HB HS HL Large memory could store 100 groups Relative to average times 32 1 information including single measured value mean value impact direction impact times material and hardness scale etc Battery information showing the rest capacity of the battery and the charge status User calibration function Software to connect to PC via USB port Li Ion rechargeable battery as the power source Charge circuit integrated inside the instrument Continuous working period of no less than 200 hours EL off and no printing Auto power off to save energy Outline dimensions 148mm X 33mm X 28mm 1 2 Main Application amp Testing Range 1 2 1 Main 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 Material identification in the warehouse of metallic materials Rapid testing in large range and multi measuring areas for large scale work piece 1 2 2 Testing Range The model includes D type C type and DL type according to the impact device Testing range refer to Table 1 and Table 2 in the Appendix 1 3 Technical Specifications Error and repeatability of displayed val
12. d polish without oil stain Support of test sample Support is not necessary for heavy sample Medium weight parts must be set on the smoothing and stable plane The sample must set absolutely equability and without any wobble Curved surface The best testing surface of sample is flat When the curvature radius R of the surface to be tested is smaller than 30mm the small support ring or the shaped support rings should be chosen The sample should have enough thickness minimum thickness of sample should conform to Table 3 12 For the sample with hardened layer on surface the depth of hardened layer should conform to Table 3 Coupling Light weight sample must be firmly coupled with a heavy base plate Both coupled surface must be flat and smooth and there is no redundant coupling agent existing The impact direction must be vertical to the coupled surface When the sample is a big plate long rod or bending piece it can be deformed and become unstable even though its weight and thickness is big enough and accordingly the test value may not be accurate So the sample should be reinforced or supported at its back Magnetism of the sample itself should be avoided 4 Testing Program 4 1 Start Up Press the key to start up the instrument The instrument then comes into working mode 4 2 Loading Pushing the loading tube downwards until contact is felt Then allow it to slowly return to the starting position
13. ethod Battery failure Replace the battery Charge failure with a new pack Charger failure Replace the charger Impact device failure Return for No measured value i repairment Ellurepowekan Battery exhaustion Charge the battery 6 4 Notice of Transport and Storage Conditions Keep it away from vibration strong magnetic field corrosive medium dumpiness and dust Storage in ordinary temperature With original packing transport is allowed on the third grade highway 24 APPENDIX Table 1 Impact device Material Method D C DL 20 0 20 6 HRC 207 68 5 69 5 682 38 4 37 0 HER 99 6 99 9 Steel and cast 5914 steel HRA 85 8 HB 127 651 80 683 81 646 HV 83 976 80 996 80 950 32 2 31 8 30 6 HS 99 5 102 1 96 8 Cold work ed EG tool steel oi o HV 80 898 100 941 46 5 HRB Stainless steel 101 7 HB 85 655 HV 85 802 G T HRC rey cast iron HB 93 334 HV HRC Nodular cast iron HB 131 387 HV Cast aluminum HB d eios eee dal 23 8 29702 Il ids HEB 84 6 85 0 BRASS copper zi HB 40 173 25 nc alloys 13 5 HEB 95 3 BRONZE copper aluminum tin HB 60 290 alloys Wrought copper HB 45 315 alloys Table 2 No Material HLD Strength o MPa 1 Mild steel 350 522 374 780 2 High Carbon steel 500 710 737 1670 3 Cr steel 500 730 707 1829 4
14. even seer re vett bed ee Ge ek ee e eg ee ee ee ende 17 34 Power AUG RE AR RE EE 17 3 2 ER EE RE eee ee e edens 17 5 3 Hardness Strength testing switch esses 18 5 4 Hardness Scale Setting eee 19 5 5 Impact Direction Setting eese 19 5 6 Average Times Setting essent 19 3 7 Saving testing T sult auct tes 19 DO Data logging id oe e ie doshas ei ies ts 20 3 9 System Reset diee ete eee tii do 21 DLO EL Backlight ta EE eee ees 21 3 1 Auto Powering Off ER EE OE EE OE 21 3 42 Battery Charge eet eerte erret Innen 22 5 13 Connecting to a Computer eese 22 5 14 Error Code Reference eerte 23 6 MAINTENANCE amp SERVICING esee een 23 6 1 Impact Device Maintenance ese se Ge ee Re ee Re 23 6 2 Instrument Maintenance Program esee 23 6 3 Fault Analysis amp Evacuation eene 24 6 4 Notice of Transport and Storage Conditions 24 APPENDIX ettet pet tete ER OE e CR 25 Table J ER EE RE EE dran 25 RE EE EE EK ER 26 EE OR RE ER a oi d ib 27 Table aene OR D EE AT 28 1 Overview 1 1 Advantages Compact and integrated The impact device and the main body integrated together Wide measuring range Based on the principle of Leeb hardness testing theory It can measure the Leeb hardness of all metallic materials Large screen LCD showing all functions and parameters With EL backgroun
15. g for 20 seconds Except pressing press any key could stop the twinkle of LCD screen and stop the operation of power off at the moment While the voltage of the battery is too low the display will show lt E00 gt then power off automatically When the instrument is being charged the Auto Power Off will not function 21 5 12 Battery Charge The instrument uses a Rechargeable battery as its power source When the battery almost runs out the battery symbol on the display will glint It needs charging as soon as possible Try to drain your battery pack as fully as possible before it is charged for longer battery service Plug the power adapter into the mains supply power socket Then plug one end of the USB cable into the USB port of the instrument and the other end to the adapter If the instrument is in power off condition it will turns on automatically after the USB cable is inserted into the adapter The battery symbol will alternately shows between and LEA when charging The more of the dark part indicates the more close to full capacity When the battery is fully charged the charging process will be automatically stopped Please use the configured AC DC adapter to charge the battery An alternative charging method is connecting the instrument to PC via the USB cable 5 13 Connecting to a Computer Insert one connection plug of the USB cable into the USB socket on the top side of main body and insert the o
16. hip between the material index number displayed on the instrument screen and the material is as follows TABLE 5 2 Index MATERIAL Index Material 0 Mild steel 5 Cr Mo steel 1 HIGH CARBON STEEL 6 Cr Ni Mo steel p Cr steel 7 Cr Mn Si steel 3 Cr V steel 8 Super strength steel 4 Cr Ni steel 9 Stainless steel 5 3 Hardness Strength testing switch Long press F1 key to switch between hardness testing and strength testing Ob Note Only the D type instrument has the function of strength testing So hardness testing is the only selection if the instrument is not D type In hardness testing mode the supported hardness scale includes HL HV HB HRC HS HRB and HRA Note 18 Here only displays the valid hardness scale for the present selected material It would not display the hardness scale which is not valid Please select material firstly then select hardness scale Presetting hardness scale recovers to HL automatically after presetting material is changed 5 4 Hardness Scale Setting Short press Fl several times to select hardness scale item The hardness scale currently using will begin to flash Then short press F2 to change the hardness scale to the one you want to set 5 5 Impact Direction Setting Short press F1 several times to select the DIR item Then short press F2 to change the impact direction to what you want to set 5 6 Average Times Setting You could modify ave
17. rage times within the range of 1 to 32 as following Short press F1 several times to select the NO item Then short press F2 to set the average times to the number you want 5 7 Saving testing result By simply short pressing F2 after a new measurement finishes the screen showing the AVE icon the measured hardness strength group values will be saved to memory The newly saved file is appended as the last file of the memory At most one hundred files F00 F99 one group as one file can be stored inside the tester 5 8 Data logging This function provides the user with the ability to view delete a file group previously saved in memory Viewing stored file Group To view the memory data follow the steps 1 2 3 4 Long press F2 to activate the data logging function The memory icon will appear The instrument will display the current file name the test parameter of the group data and the mean value of the group If there is no data in the memory it will display lt E04 gt which means no memory data and then return back Short press F1 and F2 to select the desired file to view Long press F1 to see details of that group data Short press F1 and F2 to view each single measured data in that group while viewing details Deleting selected file Group The user may require deleting a file from the instrument memory The procedure is outlined in the following steps 1 2 3 Long press F2 to activate the
18. ther plug into the USB port of the PC Refer to the manual of the DataPro software for detailed information 22 5 14 Error Code Reference Error Code Explanation E00 Battery exhausted E01 Value out of range E02 Measurement not finished E03 Data already saved E04 No memory data 6 Maintenance amp Servicing 6 1 Impact Device Maintenance After the impact device has been used for 1000 2000 times please use the nylon brush provided to clean the guide tube and impact body When cleaning the guide tube unscrew the support ring first then take out the impact body spiral the nylon brush in counter clock direction into the bottom of guide tube and take it out for 5 times and then install the impact body and support ring again Release the impact body after use Any lubricant is absolutely prohibited inside the impact device 6 2 Instrument Maintenance Program When using standard Rockwell hardness block to testing if all the error is bigger than 2 HRC it may be the invalidation of impacted ball top caused by abrasion Changing the spherical test tip or impact object should be considered When the hardness tester appears some other abnormal phenomena please do not dismantle or adjust any fixedly assembled parts Fill in and present the warranty card to us The watranty service can be carried on 23 6 3 Fault Analysis amp Evacuation Fault Appearance Fault Analysis Handling m
19. ue see Tablel 1 below Table 1 1 Type of Hardness value of Error of No impact Leeb standard displayed Repeatability device hardness block value 1 D 760430HLD 6 HLD 6 HLD 530 40HLD 10 HLD 10 HLD D Se onto H2HLDL 12HLDL 3 C MIT 12HLC 12HLC Measuring range HLD 170 960 HLD Measuring direction 0 360 Hardness Scale HL HB HRB HRC HRA HV HS Display segment LCD Data memory 100 groups max relative to impact times 32 1 Battery 3 7V Li Ion Rechargeable Battery charger 5V 500mA Continuous working period about 200 hours With backlight off no printing Communication interface USB1 1 1 4 Configuration Table 1 2 No Item Remarks Standard D type C type and Config DL type optional 1 For comm And 3 USB cable charging 5V 500mA 6 Small supportring 1 8 Mamal tt 9 Instrument package Optional Other type Refer to Table 3 and impact devices and Table 4 in the support rings appendix 1 5 Working Conditions Working temperature 10 50 Storage temperature 30 60 Relative humidity lt 90 The surrounding environment should avoid of vibration strong magnetic field corrosive medium and heavy dust 1 6 Safety Instructions The instrument can only work with the specially designed battery pack and power adapter charger supplied by Mitech Co LTD Working with others may result in damage of the instrument battery leakage
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