MITECH MH310 User manual

MITECH CO., LTD.
www.mitech-ndt.com

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CONTENTS
1 Overview................................................................................................................................................................. 3
1.1 Advantages................................................................................................................................................ 3
1.2 Main Application &Testing Range.......................................................................................................... 3
1.2.1 Main Application.....................................................................................................................................3
1.2.2 Testing Range.........................................................................................................................................3
1.3 Technical Specifications...........................................................................................................................4
1.4 Configuration............................................................................................................................................. 4
1.5 Working Conditions...................................................................................................................................5
1.6 Safety Instructions.................................................................................................................................... 5
2 Structure Feature &Testing Principle............................................................................................................. 5
2.1 Structure Feature...................................................................................................................................... 5
2.1.1 The Hardness Tester Appearance...................................................................................................... 5
2.1.2 Parts of the Main body.......................................................................................................................... 6
2.1.3 D Type Impact Device...........................................................................................................................7
2.1.4 Different Types of Impact Device........................................................................................................7
2.2 Main Screen...............................................................................................................................................7
2.3 Keypad Definitions....................................................................................................................................8
2.4 Leeb Hardness Testing Principle............................................................................................................9
3 Preparation.............................................................................................................................................................9
3.1 Instrument Preparation and Inspection................................................................................................. 9
3.2 Impact Device Selection.......................................................................................................................... 9
3.3 Preparation of the Sample Surface........................................................................................................9
4 Testing Program................................................................................................................................................. 10
4.1 Start-Up.................................................................................................................................................... 10
4.3 Localization.............................................................................................................................................. 10
4.4 Testing.......................................................................................................................................................10
4.5 Read Measured Value............................................................................................................................11
4.6 Notification................................................................................................................................................11
5 Operation Detail.................................................................................................................................................. 11
5.1 Power On/Off........................................................................................................................................... 11
5.2 Material Setting....................................................................................................................................... 12
5.3 Hardness/Strength testing.....................................................................................................................12
5.4 Impact Direction Setting........................................................................................................................ 12
5.5 Average Times Setting...........................................................................................................................12
5.6 Data logging.............................................................................................................................................12
5.6.1 Viewing stored file/Group...................................................................................................................13
5.6.2 Deleting selected file/Group.............................................................................................................. 13
5.7 Print Function.......................................................................................................................................... 13
5.7.2Print the stored data.............................................................................................................................13
5.8 Date and Time Set..................................................................................................................................14
5.9 System Reset.......................................................................................................................................... 14
5.10 EL Backlight...........................................................................................................................................14
5.11 Auto Power Off...................................................................................................................................... 14
5.12 Paper Installation..................................................................................................................................14
5.13 Battery Charge......................................................................................................................................14
5.14 Battery Replacement........................................................................................................................... 15
5.15 Connecting to a Computer..................................................................................................................15
5.16 Error Code Reference..........................................................................................................................15
6 Maintenance & Servicing................................................................................................................................. 15
6.1 Impact Device Maintenance................................................................................................................. 15
6.2 Instrument Maintenance Program....................................................................................................... 15
6.3 Fault Analysis & Evacuation................................................................................................................. 16
6.4 Notice of Transport and Storage Conditions......................................................................................16
APPENDIX................................................................................................................................................................17
Table 1............................................................................................................................................................. 17
Table 2............................................................................................................................................................. 18

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Table 3............................................................................................................................................................. 19
Table 4............................................................................................................................................................. 20
User Notes............................................................................................................................................................... 21

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1 Overview
1.1 Advantages
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 background light.
Seven impact devices are available for special application. Automatically identify the type of impact
devices.
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.
Thermal printer integrated, convenient for in field printing.
NI-MH rechargeable battery as the power source. Charge circuit integrated inside the instrument.
Continuous working period of no less than 150 hours (EL off and no printing).
Auto power off to save energy.
Outline dimensions：212mm×80mm×32mm
1.2 Main Application &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
Testing range refer to Table 1 and Table 2 in the Appendix.

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1.3 Technical Specifications
Error and repeatability of displayed value see Table1-1 below.
Table 1-1
No.
Type of impact
device
Hardness value of Leeb
standard hardness block
Error of displayed
value
Repeatability
1
D
760±30HLD
530±40HLD
±6 HLD
±10 HLD
6 HLD
10 HLD
2
DC
760±30HLDC
530±40HLDC
±6 HLDC
±10 HLDC
6 HLD
10 HLD
3
DL
878±30HLDL
736±40HLDL
±12 HLDL
12 HLDL
4
D+15
766±30HLD+15
544±40HLD+15
±12 HLD+15
12 HLD+15
5
G
590±40HLG
500±40HLG
±12 HLG
12 HLG
6
E
725±30HLE
508±40HLE
±12 HLE
12 HLE
7
C
822±30HLC
590±40HLC
±12 HLC
12 HLC
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）
Printing paper: width is （57.5±0.5）mm, diameter is 30mm.
Battery pack: 6V NI-MH
Battery charger: 9V/500mA
Continuous working period：about 150 hours（With backlight off, no printing）
Communication interface：USB1.1
1.4 Configuration
Table 1-2
No.
Item
Quantity
Remarks
Standard
Configuration
1
Main unit
1
2
D type impact device
1
With cable
3
Standard test block
1
4
Cleaning brush (I)
1
5
Small support ring
1
6
Battery Charger
1
9V 500mA
7
Paper for printing
1
8
Manual
1
9
Instrument package case
1
Optional
Configuration
11
Cleaning brush (II)
1
For use with G type
impact device
12
Other type of impact
devices and support rings
Refer to Table 3 and
Table 4 in the
appendix.
13
DataPro software
1
14
Communication cable
1
15
16

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1.5 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.
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, 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.
Do not open the cover of the paper compartment or come into contact with the heating head of the
printer by hand or any part of your body to avoid burns due to high temperature when the printer is
printing.
2 Structure Feature &Testing Principle
2.1 Structure Feature
2.1.1 The Hardness Tester Appearance
1. Main unit
2. Impact device
CNT
MAT
PRT
DIR
STR
SCALE
FEED
MH310
Hardness Tester
2
M iT e c h
1

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2.1.2 Parts of the Main body
1 Socket of impact device 2 Socket of USB 3 LOGO 4 Paper compartment cover 5 LCD display
6 Keypad 7 Battery switch 8 Power jack 9 Serial Number 10 Product label 11 Battery
compartment cover
MODEL: MH310 BATTERY: 6 V
HARDNESS TESTER
Material for Hardness Testing
9-Wrought Steel
8-Wrought Copper
7-Copper-Aluminum Alloys
6-Copper-Zinc Alloys
5-Cast Aluminum Alloys
4-Nodular Cast Iron
3-Gray Cast Iron
2-Stainless Steel
1-Cold Work Tool Steel
0-Steel and Cast Steel
CHARGER: 9V DC
CNT
MAT
PRT
DIR
STR
SCALE
FEED
MH310
Hardness Tester
M iT e c h
HL0108070811
OFF---ON
1
2
3
4
5
6
7
8
9
10
11

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2.1.3 D Type Impact Device
1 2 3 4 5 6 7
1 Release button 2 Loading tube 3 Guide tube 4 Coil unit
5 Connection cable 6 Impact body 7 Support ring
2.1.4 Different Types of Impact Device
DC DL C D+15 E G
2.2 Main Screen
Below is the main display screen:
Hardness Scale
Average Icon
Direction
Battery Info
Impact Times
Measured Value
Memory Icon

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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
value or 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
Table 2-1
Turn on/off the EL
backlight
Data Save or Data
Delete
Turn the instrument
on/off
Material Selection
Hardness/Strength
switch
Plus or Up
SCALE
Hardness Scale
Selection
Direction change
Minus or Down
FEED
Manual Paper
Feed
Impact Times set
Print data
Cancel or Exit
Data logging or
Enter
Press key to store present group of measured value into memory. This operation is only valid
after displaying the mean value.
Press key and could display single measured value.
Press key could switch on of off the background light of LCD.
Press key to set the impact direction.
Press key to change the impact times in one group. The impact times item will flash when first
pressing the key, and then the impact times value will plus or minus when pressing the or
key. Press key finally to exit from changing the impact times process.
Press
S C A L E
key to change the hardness scale.
Press key to change the material. Presetting hardness scale recovers to HL automatically after
material presetting changed.
Press key to switch between hardness test and strength test. Only D and DC type of impact
device has the function of strength testing. So hardness testing is the only selection if the impact
device is not D or DC type.
Press key to print out the measured values after measurement.
Press
F E E D
key to manually feed the paper.

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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=1000×VB/ 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 block 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 key to power on the system. Then the user calibration
screen shows as left below.
Test for 5 points on the standard hardness block.
It would display the average measured value
after measuring 5 times. Press key to
change to its nominal value.
Press key to confirm the calibration finally. Or
press the key to cancel the calibration.
Range of adjustment: ±30HL.
3.2 Impact Device Selection
Refer to Appendix Table 1 and Table 3 for selection of impact device.
3.3 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 and polish, without oil stain.
Support of test sample. Support is no 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 (D, DC, D+15,C, E and DL type of impact device) and
smaller than 50mm (G type of impact device), 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.
For the sample with hardened layer on surface, the depth of hardened layer should conform to Table
3.