KERN & SOHN HMR User Manual

Sauter GmbH

Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

DIGITAL LEEB HARDNESS TESTER

Model: HMR

Table of contents

1. Overview

1.1 HMR Advantages

1.2 Main Application & Testing Range

1.2.1 Main Application

1.2.2 Testing Range

1.3 Configuration

1.4 Working Conditions

2. Structure Feature & Testing Principle

2.1 Structure Feature

2.1.1 Hardness Tester Appearance

2.1.2 Parts of the Main body

2.1.3 D Type Impact Device

2.1.4 Different types of Impact Devices

2.2 Leeb Hardness Testing Principle

3. Technical Specifications

4. Preparation & Testing

4.1 Preparation and Inspection before Testing

4.1.1 Preparation of Sample Surface

4.1.2 System Setting

4.1.3 Presetting Testing conditions

4.2 Testing Program

4.2.1 Start-up

4.2.2 Testing

4.2.3 Reading the Measured Value

4.2.4 Power Off

5. Advice

6. Operation in Details

6.1 Power On

6.2 Power Off

6.3 Testing

6.3.1 Full description of the Main Display

6.3.2 Testing Operation at the Main Display

6.3.3 Key Operation at the Main Display

6.4 Menu Structure

6.5 Test Set

6.5.1 Impact Direction Setting

6.5.2 Average Times Setting

6.5.3 Material Setting

6.5.4 Hardness Scale Setting

6.5.5 Tolerance Limit Setting

6.5.6 Hardness / б b Setting

6.6 Print Set

6.7 Memory Management

6.7.1 View from No.1 Group/ View from Ending Group

6.7.2 View from Selected No. Group

6.7.3 Data Transfer

6.7.4 Delete by Group No.

6.7.5 Delete all Data

6.7.6 Deletion Confirmation

6.8 Browsing Memory Data Groups

6.9 System Reset

6.9.1 LCD Brightness Setting

6.9.2 Date/ Time Setting

6.10 Software Information

6.11 System Calibration

6.12 EL Background Light

6.13 Auto Power Off

6.14 Battery Replacement

6.15 Connection of Data Transmission Cable

7. Fault Analysis & Fault Clearance

8. Servicing & Maintenance

8.1 Impact Device Servicing

8.2 Normal Maintenance Program

9. Calibration

10. Transport and Storage Conditions

11. Declaration of Conformity
APPENDIX
Table 1
Table 2
Table 3
Table 4

1. Overview

1.1 HMR Advantages

 Wide measuring range based on the principle of

Leeb Hardness testing theory. Leeb Hardness of
all metallic materials can be measured.

 Large screen (128 x 64 dot matrix LCD) showing

all functions and parameters.

 Testing at any angle, even upside down
 With EL background light
 Direct display of hardness scales HRB, HRC,

HV, HB, HS, HL

 Seven impact devices are available for special

applications. Automatical identification of type of
impact devices

 Large capacity memory can store 500 groups,

information including single measured value,
mean value, testing date, impact direction,
impact times, material, hardness scale etc.

 Upper and lower limit can be preset. It will alarm

automatically if the result value is exceeding the
limit.

 Battery information: rest capacity of battery is

indicated.

HMR-BA-e-1212 1

Sauter GmbH

Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

No.

Item

Qua
ntity

Remarks

Stan
dard
Config
uration

1

Main body

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

Alkaline battery

4

AA size

7

Manual

1 8

Instrument case

1 9

Optio
nal
Config
uration

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 for
HL200 software

1 14

Communication
cable

1

 Software calibration function
 Software to connect with PC and USB port
 Compact metal case, suitable for use under poor

working conditions

 Continuous working period of not less than 50

hours with two Alkaline batteries (AA size);

 Auto Power Off to save energy
 Dimensions: 132 mm x 76.2 mm
 Weight: 345 g

1.2 Main Application & Testing Range

1.2.1 Main Application

 Die cavity of molds
 Bearings and other parts
 Failure analysis of pressure vessels, steam

generators and other equipment

 Heavy work piece
 Testing the surface of a small hollow space
 Material identification in the range of metallic

materials

1.2.2 Testing Range

Please refer to Table 1 and Table 2 in the APPENDIX.

1.3 Configuration

Table 1-1

2. Structure Feature & Testing Principle

2.1 Structure Feature

2.1.1 Hardness Tester Appearance

1. Main body 2.Impact device

2.1.2 Parts of the Main body

1.4 Working Conditions

Working Temperature: 0°C up to +40°C
Storage Temperature: -30°C up to +60°C
Relative humidity: ≤ 90%
Vibrations, strong magnetic field, corrosive medium and
heavy dust should be avoided in the surroundings.

HMR-BA-e-1212 2

1 Socket of USB
2 Aluminium case
3 Belt hole
4 Battery cover
5 Keypad
6 LCD Display
7 Socket of Impact Device
8 Aluminium case, (backside)
9 Label (backside)

2.1.3 D Type of Impact Device

1. Release button

2. Loading Tube

Sauter GmbH

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E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
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Internet: www.sauter.eu

Instruction Manual

HMR

N
o
.

Typ
e of
im
pact
devi
ce

Hardness value
of Leeb
standard
hardness block

Error of
displayed
value

Repeata
bility

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

3. Guide Tube

4. Coil unit

5. Connection cable

6. Impact body

7. Support ring

2.1.4 Different types of Impact Devices

2.2 Leeb Hardness Testing Principle

The basic testing principle is to use an impact body of a
certain weight which impacts against the testing surface
under certain test force. The impact velocity and the
rebound velocity of the impact body are measured
respectively when the spherical test tip is located 1mm
above the surface being tested.
The calculation formula is as follows:

HL= 1000 x VB/VA

Where HL= Leeb Hardness Value
VB= Rebounding velocity of the impact body
VA= Impact velocity of the impact body

3. Technical Specifications

 Error and repeatability of the displayed value,

see Table 3-1:

HMR-BA-e-1212 3

 Measuring range: HLD: (170 ~ 960) HLD
 Measuring direction: 0 ~ 360°
 Hardness Scale: HL, HB, HRB, HRC, HRA,

HV, HS

 Display: dot matrix LCD,128 x 64 dots
 Data memory: max. 500 groups
 Power supply: 3V, (2AA size Alkaline batteries)
 Continuous working period: about 50 hours

(with backlight off)

 Communication interface: USB1.1

4. Preparation & Testing

4.1 Preparation and Inspection before Testing

4.1.1 Preparation of Sample Surface

Preparation of the sample surface should conform to the
relative requirements in APPENDIX Table 3.

 During the preparation of the sample surface,

any heating or cold processing on this surface
should be avoided.

 Too big roughness of the surface being

measured could cause errors. The surface of the
sample should show metallic luster, be smooth
and polished, without any stains of oil etc.

 Support of the sample is not necessary for

heavy objects. Medium-weight samples have to
be placed onto a smooth and stable plane. It
must be placed in absolute equability and
without any wobble.

 Curved surface: The best testing surface, of

course, is flat. When the curvature radius R of
the surface to be tested is smaller than 30 mm
(D, DC, D+15, C, E and DL type of impact
device) and smaller than 50 mm (G type of
impact device), the small support rings should
be chosen.

 The sample should have enough thickness, the

minimum thickness of it should conform to
Table 3.
*For a sample with a hardened layer on its surface,
the depth of the hardened layer should also conform
to Table 3.

 Coupling: Light-weight samples must be firmly

coupled with a heavy base plate. Both coupled

surfaces have to be flat and smooth; there may

not rest any redundant coupling agent. The

impact direction must be vertical to the coupled

Sauter GmbH

Ziegelei 1
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E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

surface. If 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; accordingly, the test value might
not be accurate. So the sample should be
reinforced or supported at its back.

 Magnetism of the sample itself should be

avoided.

4.1.2 System Setting

See 6.9 for details.

4.1.3 Presetting Testing conditions

See 6.5 for details.

4.2 Testing Program

The hardness tester has to be verificated by using the
hardness block. The error and repeatability of the
displayed value should be within the regulation of
APPENDIX Table 2.

4.2.1 Start-up

1) The plug of the impact device has to be inserted into the
socket of the impact device of the instrument.

2) The key has to be pressed to power on. Now the
instrument is in testing condition.

4.2.2 Testing

- The release button on the upside of the impact device
has to be pressed to start testing. 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 measurement area of the sample usually needs 3
to 5 times of testing operations. The result data dispersion
should not be more than the mean value ± 15 HL.

- The distance between any two impact points or from the
centre of any impact point to the edge of the sample
should conform to the regulation of Table 4-1.

- If an accurate conversion from the Leeb hardness value
to another hardness value is requested, a contrastive test
is needed to get conversion relations for the special
material. An inspected qualified Leeb hardness tester and
a corresponding hardness tester have to be used to test at
the same sample respectively. For each hardness value,
each homogeneous measurement, 5 points of Leeb
hardness value are needed. They are in the surroundings
of more than three indentations which need conversion of
hardness. The Leeb hardness arithmetic average value
and the corresponding hardness average value as
correlative value respectively are used to establish an
individual hardness contrastive curve. The contrastive

curve at least should include three groups of correlative
data.
Table 4-1

4.2.3 Reading the Measured Value

4.2.4 Power Off

The key has to be pressed to power off.

5. Advice

- The impact device must be replaced during the
instrument is powered off. Otherwise the type of impact
device cannot be identified by the main body. The circuit
board of the main body may get damaged.

- If the testing times are less than the preset times value,
the current test value can not be saved. 【 AVG 】 can be
pressed to end the testing process in advance if the values
shall be saved.

- When pressing 【 AVG 】 to end testing in advance, the
【 Auto save】 , 【 Auto transfer】 settings will not work.

- Only D and DC type of impact device have got the
function of strength measurement. Using other types of
impact device, the 【 Set hardness orбb 】 can not be
modified. The 【 Set hardness orбb 】 setting will be set
to【 Hardness 】 automatically after replacing the impact
device, whether the setting is【 Hardness 】 or not before.

- Not all materials can be converted to all hardness style
values. The hardness style is reset to HL automatically
after changing material. So, material has to be selected
first before changing the hardness style.

6. Operation in Details

6.1 Power On

The key has to be pressed to power on the instrument.
Following is shown on the screen:

The type of impact device will automatically be detected
during powering on. This information will be displayed on
the screen (Probe Type). After several seconds, the

HMR-BA-e-1212 4

Sauter GmbH

Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

Ma­terial

Average value
indicator

Hardness
scale

Meas
ured
value

Impact times
count

Impact
direction

Battery
Inform.

screen will exit and the main display interface will be
entered.

6.2 Power Off

By pressing the key the system can be powered off in
any state.

6.3 Testing

Below, the main display is shown:

6.3.1 Full description of the Main Display

Battery information: displays the rest capacity of the
battery.

Impact direction: displays the present impact direction.

Average value indicator: it appears to show the mean

value when the preset impact times are reached.

Hardness scale: Hardness method of the present
measured value.

Measured value: displays the present single time
measured value (without mean value indicator), or displays
the present mean value (with average value indicator
prompting). ↑ means that the value is over conversion or
measurement range. ↓ means that it is lower than
conversion or measurement range.

Material: The present preset material.

Impact times count: Times that have been impacted.

6.3.2 Testing Operation at the Main Display

Testing operation can be carried out under this interface.
After each impact operation, the current measured value
can be displayed. Impact times count plus one, the buzzer
will alert a long howl if the measured value is not within the
tolerance limit. As soon as the preset impact times are

reached, the buzzer will alert a long howl. After two
seconds, the buzzer will alert a short howl and the mean
value will be displayed.

6.3.3 Key Operation at the Main Display

- The 【 SAVE 】 key has to be pressed to store the present
group of measured values into memory. This operation is
only valid after displaying the mean value.

- The 【 DEL】 key has to be pressed to delete the latest
single measured value. After pressing this key, on the

screen will be shown following:
The key or the key has to be pressed to

move the cursor to 【 YES 】 or 【 NO 】 .

【 ETR 】 has to be pressed to confirm.
【 ESC 】 has to be pressed to cancel deletion.

- The 【 】 or 【 】 key has to be pressed to display the
single measured value.

- By pressing 【 AVG , testing can be ended although the
preset impact times have not been reached and to display
the average value.

- The background light of LCD has to be switched on and
off by pressing 【 】 .

- 【 MENU 】 has to be pressed to enter the system Preset
Menu.

- By pressing , the impact direction can be preset.

- 【 TIME 】 key has to be pressed to change the impact
times in one group. The impact times count item will be
highlighted when the 【 TIME 】 key has been pressed. The
impact times count value will be added one with each
pressing. The value will roll back to 1 after 32 has been
reached.

- The 【 HD】 key has to be pressed to change the hardness
scale.

- By pressing 【 MTL 】 material setting can be changed.
Presetting the hardness scale, HL is automatically
recovered after material presetting has been changed.

6.4 Menu Structure

Both, presetting system parameters and additional
functions, can be realised by menu operation. At the main
display interface, 【 MENU 】 key has to be pressed to enter
the main menu, as shown in following picture:

HMR-BA-e-1212 5

Sauter GmbH

Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

Main display interface

Test Set

Print Set

Memory Manager
System Set
Software Info

Impact Direc.
Average
Material
Hardness Scale
Tolerance Limit
Hard/бb：Hard

(Print Set is NOT
available）

View From No.1
View From End
View From No.
Transfer
Delete by No.
Delete All

Auto Save：

Auto Print：

（N/A）
Auto Delete：
Auto Trans.：
Key Sound：
Warn. Sound：

6.5 Test Set

At the main display interface, 【 MENU 】 key has to be
pressed to enter the main menu.

【 ETR 】 has to be pressed to enter Test Set Menu. The
symbol ↓ at the left side of underside menu indicates that

the menu has not ended. 【 】 key has to be pressed to
glance downward continuously.
The symbol ↑ at the left side of the upside menu indicates

that the menu has not ended. 【 】 has to be pressed to
glance upward continuously.

The 【 】 or 【 】 key has to be pressed to move the
cursor to the desired line to set and 【 ETR 】 has to be
pressed to confirm.

Note: 1. When 【Hard/бb】 is switched to бb, hardness
scale cannot be selected. The cursor will skip over

【

Hardness Scale】while it is moved.

HMR-BA-e-1212 6

2. Only D type of impact device has got the function of
бb measurement. So the cursor cannot be moved to

【

Hard/бb】while another impact device is used.

6.5.1 Impact Direction Setting

The key or the key has to be pressed to
move the cursor to the desired impact direction.

【 ETR 】 has to be pressed to confirm.
【 ESC 】 has to be pressed to cancel.

6.5.2 Average Times Setting

Average times can be modified within the range of 1 to 32.
The 【 0 】 ~ 【 9 】 key has to be pressed to input the
number value. The cursor will shift right around
automatically when inputting the number.

【 ETR 】 has to be pressed to confirm.
【 ESC 】 has to be pressed to cancel.

6.5.3 Material Setting

If 【Hard/бb】is preset to hardness, following material will
be displayed: Steel and Cast Steel, Cold Work Tool Steel,
Stainless Steel, Grey Cast Iron, Nodular Cast Iron, Cast
Aluminium Alloys, Copper-Zinc Alloys, Copper-Aluminium
Alloys, Wrought Copper and Wrought Steel.

The 【 】 or 【 】 key has to be pressed to move the
cursor to the material desired to preset.

【 ETR 】 has to be pressed to confirm.
【 ESC 】 has to be pressed to cancel.

Note: 1. Presetting the hardness scale, HL is
automatically recovered after material presetting has
been changed.

2. Please select material first and then select hardness
scale.

If 【Hard/бb】is preset to бb, following material will be
displayed: Mild Steel, High-Carbon Steel, Cr Steel, Cr-V

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Instruction Manual

HMR

Steel, Cr-Ni Steel, Cr-Mo Steel, Cr-Ni-Mo Steel, Cr-Mn-Si
Steel, Super Strength Steel and Stainless Steel.

The 【 】 or 【 】 key has to be pressed to move the
cursor to the material desired to preset.

【 ETR 】 has to be pressed to confirm.
【 ESC 】 has to be pressed to cancel.

6.5.4 Hardness Scale Setting

【 ETR 】 has to be pressed to switch between Hard and

бb.

Note: Only D and DC type of impact device have got
the function of бb measurement. So, “Hard” is the only
selection if the impact device is not D or DC type.

6.6 Print Set

At the main display interface, 【 MENU 】 key has to be
pressed to enter the main menu. Printing function is not
available at Hardness Tester HMR.

6.7 Memory Management

At the main display interface, the 【 MENU 】 key has to be
pressed to enter the main menu.

The 【 】 or 【 】 key has to be pressed to move the
cursor to the hardness scale desired to preset.

【 ETR 】 has to be pressed to confirm.
【 ESC 】 has to be pressed to cancel.

Note: 1. Only the valid hardness scale for the present
selected impact device and material are displayed.
An invalid hardness scale will not be displayed.

2. Please select material first and then select hardness
scale.

3. Presetting the hardness scale, HL is automatically
recovered after material presetting has been changed.

6.5.5 Tolerance Limit Setting

The 【 0 】 ~ 【 9 】 key has to be pressed to input the
number value. The cursor will shift right around
automatically when inputting.

【 ETR 】 has to be pressed to confirm.
【 ESC 】 has to be pressed to cancel.

Note: 1. If the preset value exceeds the measurement
range, the user will be reminded by the Tester to reset.

2. If the bottom limit is larger than the upper limit, they
will be exchanged automatically.

6.5.6 Hardness / бb Setting

The 【 】 or 【 】 key has to be pressed to move the
cursor to 【 Memory Manager】 . 【 ETR 】 key has to be
pressed in 【 Memory Manager】 menu. If there is no data in
memory, <No Data!> will be displayed. Then it has to be
returned.

The 【 】 or 【 】 key has to be pressed to move the
cursor to the desired function.
【 ETR 】 has to be pressed to confirm.

6.7.1 View from No.1 Group/ View from Ending Group

【 View From No.1 】 : values in the memory from the first
group are displayed.
【 View From End 】 : values in the memory from the
ending group are displayed.

6.7.2 View from Selected No. Group

The digit figure keys have to be pressed to input the
number.
【 ETR 】 has to be pressed to start displaying memory
data from the selected beginning group.
【 ESC 】 has to be pressed to cancel.

HMR-BA-e-1212 7

Sauter GmbH

Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

Auto Save: Off
Auto Print: Off
Auto Delete: Off
Auto Trans: Off
Key sound: On
Warn. Sound: On
LCD Brightness

Time Date Set 日

No.001 12/03 652HL

No.002 12/03 587HL

No.003 12/03 820HL

No.004 12/03 693HL

No.005 12/03 783HL

No.006 12/03 782HL

No.007 12/03 579HL
No.008 12/03 687HL

No.002 12/03 785HL

No.003 12/03 516HL

No.004 12/03 789HL

No.005 12/03 570HL

No.006 12/03 852HL

No.007 12/03 523HL

No.008 12/03 796HL

No.001 12/03 514HL

6.7.3 Data Transfer

【 Transfer 】 has to be pressed to export the values stored
in memory as text format to PC by USB port.

6.7.4 Delete by Group No.

The 【 】 or 【 】 key has to be pressed to see previous
or next page.

【 ESC 】 has to be pressed to exit browsing.
【 ETR 】 has to be pressed and then 【 】 or 【 】 to

move the cursor to the desired line you want to see the
details from. 【 ETR 】 has to be pressed to see details of
that group.

【 Delete by No. 】 :The range of deleted groups is
displayed. The digit figure keys have to be pressed to input
the number.

【 ETR 】 has to be pressed to delete the selected groups.
【 ESC 】 has to be pressed to cancel the operation.

Note: 1.If the present group exceeds the actual range,
the actual groups among them will be deleted!

2. The instrument may not be powered off while
deleting data. This could lead to unpredicted
consequences!

6.7.5 Delete all Data

By pressing 【 Delete All 】 , all data in memory will be
deleted.

6.7.6 Deletion Confirmation

The key or the key has to be pressed to
move the cursor to 【 YES 】 and 【 】 key deletion.
The key or the key has to be pressed to

move the cursor to 【 NO 】 and 【 ETR 】 has to be pressed
to cancel deletion.
【 ESC 】 has to be pressed to cancel deletion, no matter
where the cursor is located.

6.8 Browsing Memory Data Groups

HMR-BA-e-1212 8

The 【 】 or 【 】 key has to be pressed to browse details
including average value, test set and each single value.
【 ESC 】 has to be pressed to return to previous display.

6.9 System Set

At the main display interface, 【 MENU 】 key has to be
pressed to enter the main menu.

【 】 or 【 】 key has to be pressed to move the cursor
to 【 System Set 】 Menu. 【 ETR 】 has to be pressed to
enter 【 System Set 】 Menu.

【 】 or 【 】 key has to be pressed to move the cursor
to the desired item.
By pressing, the setting can be directly modified or into the

corresponding screen. 【 ESC 】 has to be pressed to exit.
【 Auto Save 】 , 【 Auto Delete 】 , 【 Auto Trans. 】 , 【 Key
Sound 】 , 【 Warn. Sound 】 can be switched on or off now.
If 【 Auto Save 】 is set to <On>, according to 3б rule, gross
errors can be cancelled automatically after having
measured preset average times or pressing end in
advance. If there is any data cancelled, it needs
supplemental measurement to reach the preset times.
If 【 Auto Trans. 】 is set to <On>, the value of the present
group can be exported by USB after measuring and
displaying the average value.
If 【 Key Sound 】 is set to <On>, the buzzer will make a
short hoot while a key is being pressed each time.

Sauter GmbH

Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

Time Date Set

-------------------­10/05/2009 11:02

If 【 Warn. Sound 】 is set to <On>, if the measured value
exceeds the tolerance limit, the preset average times or
deleting data are reached, the buzzer will make a long
hoot.

6.9.1 LCD Brightness Setting

The 【 】 key has to be pressed to enhance brightness.
Brightness can be weakened by pressing 【 】 key.

【 ETR 】 has to be pressed to confirm.
【 ESC 】 has to be pressed to cancel.

6.9.2 Date/ Time Setting

Present time and date are displayed as „M/D/Y H/M“.

The figure (0~9) key has to be pressed to modify the
present figure. The cursor will move automatically from the
left to the right after modifying.

【 ETR 】 has to be pressed to confirm,
【 ESC 】 has to be pressed to cancel modification.

6.10 Software Information

At the main display interface, 【 MENU 】 key has to be
pressed to enter the main menu.

【 】 or 【 】 key has to be pressed to move the cursor
to 【 Software Info 】 . The 【 ETR 】 key has to be pressed to
enter 【 Software Info 】 screen.

This screen displays information about the main body and
the firmware. The version, Code and SN are changing with
the firmware.

6.11 System Calibration

HMR Hardness Tester and the impact device have to be
calibrated by using the hardness block before the first use

or if it hasn’t been used for a longer time or after having

reset the system.
The 【 】 key and the 【 ETR 】 key have to be pressed to

power on the system. Then the software calibration screen
will display following:

The impact direction has to be set at 【 】 .
5 points have to be measured on the standard hardness
block.

The average value will be displayed after measuring 5
times.

【 】 or 【 】 key has to be pressed to input the nominal
value. 【 ETR 】 has to be pressed to confirm,
【 ESC 】 has to be pressed to cancel this operation.
Range of adjustment: ±15HL.

6.12 EL Background Light

By means of the background light it is convenient to work
in dark conditions. 【 】 key has to be pressed to switch

on or off the background light at any time if necessary,
after the instrument is powered on.

6.13 Auto Power Off

- This hardness tester has got the function of powering off
automatically to save power in case if there is neither key
operation nor measurement within 5 minutes. Any key,

except 【 】 key, can be pressed to stop the twinkle of
the LCD screen and thus, stop the operation of powering
off at that moment.

- While the voltage of battery is too low, <Battery empty!>
will be shown on the screen. Then the instrument powers
off automatically.

6.14 Battery Replacement

Two AA size Alkaline batteries are necessary as power

resource. After several hours’ usage, the battery symbol

on the screen will be shown as . The less dark parts
are indicated, the more close to get filled. When the
capacity runs out, the battery symbol will be shown as

and the symbol will begin to flash. Now batteries

have to be replaced.

HMR-BA-e-1212 9

Sauter GmbH

Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

M

0

1

2

5

4

8

7

+

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An o d e

Ca t ho d e

HA RD

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If batteries are exhausted, they
should be replaced as follows:

- The instrument has to be
powered off.

- The circular battery cover has
to be removed and the batte­ ries have to be taken off.

- The new batteries have to be
installed and the battery
cover has to be reset.

- The instrument has to be
powered on again to check.

Pay attention to the polarity of the batteries!
The batteries have to be taken out if the instrument
hasn’t been used for a longer period of time.

6.15 Connection of Data Transmission Cable

One connection plug of transmission cable (optional parts)
has to be inserted into the socket on the up left side of the
main body. The other plug has to be inserted into the USB
socket in the back of the computer.

7. Fault Analysis & Fault Clearance

The warranty card has to be filled in and sent to SAUTER
GmbH. The warranty service will be performed within a few
working days.

9. Calibration

The HMR hardness tester has to be calibrated every year.

10. Transport and Storage Conditions

* The instrument has to be kept away from vibration,
strong magnetic field, corrosive medium, dampness and
dust. Safekeeping in ordinary temperature.

DESIGNED IN REGARD TO THESE STANDARDS:

 ASTM A956
 DIN 50156

11. Declaration of Conformity

8. Servicing & Maintenance

8.1 Impact Device Servicing

 After 1000 to 2000 times of usage, the impact

body and the guide tube have to be cleaned with
the provided nylon brush. When cleaning the
guide tube, the support ring has to be
unscrewed first. Then the impact body has to be
taken out. The nylon brush has to be spiralled in
counter-clock direction into the bottom of the
guide tube. It has to be taken out and repeated
for 5 times. At last, the impact body and the
support ring have to be installed again.

 The impact body has to be released after use.
 Any lubricant is absolutely prohibited inside the

impact device.

8.2 Normal Maintenance Program

* If the standard Rockwell hardness block is used to test
and if all the error is bigger than 2 HRC, the ball top of the
impact device or the impact object may have to be
changed. The invalidation may be caused by abrasion.
* If any other abnormal phenomena appear to the
hardness tester, nothing may be dismantled or any fixed
parts may not be adjusted by the user himself.

HMR-BA-e-1212 10

Sauter GmbH

Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

Material

Method
Impact device

D/DC

D+15

C G E

DL

Steel and cast steel

HRC

20～68.5

19.3～67.9

20.0～69.5

22.4～70.7

20.6～68.2

HRB

38.4～99.6

47.7～99.9

37.0～99.9

HRA

59.1～85.8

61.7～88.0

HB

127～651

80～638

80～683

90～646

83～663

81～646

HV

83～976

80～937

80～996

84～1042

80～950

HS

32.2～99.5

33.3～99.3

31.8～102.1

35.8～102.6

30.6～96.8

Cold work tool steel
HRC

20.4～67.1

19.8～68.2

20.7～68.2

22.6～70.2

HV

80～898

80～935

100～941

82～1009

Stainless steel
HRB

46.5～101.
7

HB

85～655

HV

85～802

Grey cast iron
HRC

HB

93～334

92～326

HV

Nodular cast iron
HRC

HB

131～387

127～364

HV

Cast aluminium
alloys

HB

19～164

23～210

32～168

HRB

23.8～84.6

22.7～85.0

23.8～85.5

BRASS (copper-zinc
alloys)

HB

40～173

HRB

13.5～95.3

BRONZE (copper­alum./tin alloys)

HB

60～290

Wrought copper
alloys

HB

45～315

No.

Material

HLD

Strength σ

b

(MPa)

1

Mild steel

350～522

374～780

2

High-carbon steel

500～710

737～1670

3

Cr- Steel

500～730

707～1829

4

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

755～1993
9

Super strength steel

630～800

1180～2652

10

Stainless steel

500～710

703～1676

APPENDIX Table 1

Table 2

HMR-BA-e-1212 11

Sauter GmbH

Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu

Instruction Manual

HMR

Type of impact device

DC(D)/DL

D+15

C G E

Impact energy
Mass of impact body

11mJ

5.5g/7.2g

11mJ

7.8g

2.7mJ

3.0g

90mJ

20.0g

11mJ

5.5g

Test tip hardness:
Diam. Test tip:
Material of test tip:

1600HV
3mm
Tungsten
carbide

1600HV
3mm
Tungsten
carbide

1600HV
3mm
Tungsten carbide

1600HV
5mm
Tungsten carbide

5000HV
3mm
synthetic diamond

Impact device diameter:
Impact device length:
Impact device weight:

20mm
86(147)/ 75mm
50g

20mm
162mm
80g

20mm
141mm
75g

30mm
254mm
250g

20mm
155mm
80g

Max. hardness of sample

940HV

940HV

1000HV

650HB

1200HV

Mean roughness value of
sample surface Ra:

1.6μm

1.6μm

0.4μm

6.3μm

1.6μm

Min.weight of sample:
Measure directly
Need support firmly
Need coupling tightly

>5kg
2～5kg

0.05～2kg

>5kg
2～5kg

0.05～2kg

>1.5kg

0.5～1.5kg

0.02～0.5kg

>15kg
5～15kg

0.5～5kg

>5kg
2～5kg

0.05～2kg

Min. Thickness of sample :
Coupling tightly
Min. layer thickness for
surface hardening

5mm
≥0.8mm

5mm
≥0.8mm

1mm
≥0.2mm

10mm
≥1.2mm

5mm
≥0.8mm

Size of tip indentation

Hardness
300HV

Indentation
diameter
Depth of indentation

0.54mm
24μm

0.54mm
24μm

0.38mm
12μm

1.03mm
53μm

0.54mm
24μm

Hardness
600HV

Indentation
diameter
Depth of indentation

0.54mm
17μm

0.54mm
17μm

0.32mm
8μm

0.90mm
41μm

0.54mm
17μm

Hardness
800HV

Indentation
diameter
Depth of indentation

0.35mm
10μm

0.35mm
10μm

0.35mm
7μm

--

--

0.35mm
10μm

Available types of impact devices

DC: test hole or
hollow cylindrical
DL: test slender
narrow groove or
hole

D+15: test
groove or
reentrant
surface

C: test small, light
thin parts and
surface of
hardened layer

G: test large,
thick, heavy and
rough surface
steel

E: test super high
hardness material

Table 3

HMR-BA-e-1212 12