PCE Instruments PCE-HT 224E Users guide

© PCE Instruments

PCE-HT 224E Concrete Test Hammer

User Manual

User manuals in various languages (français,

italiano, español, português, nederlands, türk, polski,

русский, 中文) can be found by using our

product search on: www.pce-instruments.com

Last change: 19 December 2023

v1.0

English

© PCE Instruments

Contents

1 Safety notes ........................................................................................... 1

2 Specifications ........................................................................................ 2

2.1 Technical specifications ................................................................................................... 2

2.2 Delivery scope.................................................................................................................. 2

3 System description ............................................................................... 3

3.1 Device description ............................................................................................................ 3

3.2 Description of the operating keys ..................................................................................... 4

3.3 Technical data .................................................................................................................. 4

4 Measurement parameters .................................................................... 5

4.1 Concrete strength calculation ........................................................................................... 5

4.2 Concrete strength value in the standard setting ................................................................ 5

5 Operation ............................................................................................... 6

5.1 Start a simple test ............................................................................................................ 6

5.2 Test series in the measurement menu with default settings .............................................. 6

5.3 Calibration ........................................................................................................................ 8

5.4 Start new measurement ................................................................................................... 8

5.5 Enter part name ............................................................................................................... 8

5.6 Enter the number of measurements in the test zone ......................................................... 9

5.7 Test zone entry ................................................................................................................ 9

5.8 Repeat test of the current test zone .................................................................................11

5.9 „Basic" measurement settings .........................................................................................11

5.10 Review measurement data ..............................................................................................12

5.11 Delete measurement data ...............................................................................................13

6 Data transfer ........................................................................................ 13

6.1 Set up data transfer .........................................................................................................13

6.2 Establishing a connection to the PC ................................................................................14

6.3 Driver installation .............................................................................................................14

6.4 Starting and exiting the PC software ................................................................................15

7 Main menu ........................................................................................... 16

7.1 Setting measuring units ...................................................................................................16

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7.2 Setting the upper / lower limit values ...............................................................................16

7.3 Rights management, password settings ..........................................................................17

7.4 Energy saving settings ....................................................................................................17

7.5 Date setting .....................................................................................................................18

7.6 Setting the counter ..........................................................................................................18

7.7 Battery status display ................................................................ ......................................18

7.8 Instrument data (Info of Instrument).................................................................................18

8 Calibration ........................................................................................... 19

8.1 Completion of a test series ..............................................................................................19

9 Maintenance and servicing ................................................................ 20

10 PC software ......................................................................................... 20

11 Appendix 1 - Troubleshooting ........................................................... 21

12 Appendix 2 - Conversion table for concrete strength ..................... 24

13 Contact ................................................................................................. 25

14 Disposal ............................................................................................... 25

© PCE Instruments

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1 Safety notes

Please read this manual carefully and completely before you use the device for the first time. The
device may only be used by qualified personnel and repaired by PCE Instruments personnel.
Damage or injuries caused by non-observance of the manual are excluded from our liability and
not covered by our warranty.

• The device must only be used as described in this instruction manual. If used otherwise,
this can cause dangerous situations for the user and damage to the meter.

• The instrument may only be used if the environmental conditions (temperature, relative

humidity, …) are within the ranges stated in the technical specifications. Do not expose

the device to extreme temperatures, direct sunlight, extreme humidity or moisture.

• Do not expose the device to shocks or strong vibrations.

• The case should only be opened by qualified PCE Instruments personnel.

• Never use the instrument when your hands are wet.

• You must not make any technical changes to the device.

• The appliance should only be cleaned with a damp cloth. Use only pH-neutral cleaner,

no abrasives or solvents.

• The device must only be used with accessories from PCE Instruments or equivalent.

• Before each use, inspect the case for visible damage. If any damage is visible, do not

use the device.

• Do not use the instrument in explosive atmospheres.

• The measurement range as stated in the specifications must not be exceeded under

any circumstances.

• Non-observance of the safety notes can cause damage to the device and injuries to
the user.

We do not assume liability for printing errors or any other mistakes in this manual.
We expressly point to our general guarantee terms which can be found in our general terms of

business.

© PCE Instruments

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2 Specifications

2.1 Technical specifications

Measurement range

10 ...100 N/mm²

Accuracy
of the rebound value R

±0.1 R
Display

OLED

Nominal kinetic energy

2.207 J

Compliance

Technical regulations for rebound measurement
(JGJ/T23-2001)

Interface

Mini USB

Memory

1000 data units with 256 measurements each

Operating conditions

-4 ... 40 °C

Power supply

3.7 V Li-Ion battery

Power supply (mains adaptor)

Primary: 100 ... 240 V AC, 50/60 Hz
Secondary: 5 V DC, 1 A

Dimensions

280 x 75 x 60 mm / 11 x 3 x 2.4 in

Weight

approx. 1.2 kg / 2.6 lbs

2.2 Delivery scope

1 x PCE-HT 224E material tester
1 x mini-USB cable
1 x emery stone in storage box
1 x charger
1 x transport case
1 x user manual

The software can be downloaded free of charge from our download area:

https://www.pce-instruments.com/english/download-win_4.htm

© PCE Instruments

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3 System description

3.1 Device description

1. Retaining nut

2. Release screw

3. Retaining claw

4. Retaining pin

5. Guide plate

6. Locking button

7. Housing body

8. Housing

9. Guide rod

10. Impact weight

11. Guide bush

12. Two-piece retaining ring

13. Felt ring

14. Impact body

15. Retaining nut

16. Return spring

17. Impact spring

18. Housing retaining ring

19. Housing, top

20. Signal generator

21. Sensor element

22. Signal transmitter

23. LCD

24. Measuring strips

25. Rechargeable battery

26. Guide rail

27. Control keys

28. Locking spring

29. Pressure spring

30. Rear cover

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3.2 Description of the operating keys

3.3 Technical data

Impact energy

2.207 J ±0.100 J

Bending stiffness of the return spring

785 ±30.0 N/m

Internal length of the sensor

20.0 ±0.2 mm

Frictional force of the sensor

0.65 ±0.15 N

Radius of the impact body

R 25 ±1.0 mm

Active length of the impact spring

61.5 ±0.3 mm

Length of the impact body

75.0 ±0.3 mm

Display resolution

256 x 64 pixels

Max. number of test zones per component

16

Max. number of test points per test zone

16

Sensor type

contactless optocoupler sensor

Units of measurement, adjustable

MPa, N/mm²; kgf/mm²; psi

Communication options to the PC

serial interface (optional Bluetooth)

On/off key

Up key

Down/delete key

Enter key

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4 Measurement parameters

4.1 Concrete strength calculation

The test angle and the surface of the test zone must be set accordingly if the concrete hardness
tester is not in a horizontal position. This allows the device to automatically calculate the
corresponding values during the measurement.

Concrete carbonization: The carbonization depth, if known, can be entered and taken into
account.

The PCE-HT 224E is able to use 5 different concrete strength curves:

- no standard

- standard, ready-mixed concrete (national standard-pumping)

- standard, in-situ concrete (national standard-non pumping)

- concrete strength curve North America

- user-specific concrete strength curve

4.2 Concrete strength value in the standard setting

Each test zone should be tested 16 times. After 16 tests, the 3 highest and 3 lowest values are
cancelled and the average value of the 10 remaining tests is calculated. This average value is
then the measured value determined for the test zone.

Before starting the test, the test angle and the test direction must be set so that the concrete test
hammer automatically takes the corresponding correction values into account.

Concrete strength and standard deviation
After testing the 16 measuring points, the PCE-HT 224E automatically calculates the concrete
strength value and the standard deviation. The determined values are saved.

Calculation of concrete strength in customised test mode
If the parameters preset by the user do not correspond to the standard set of rules, these are to
be regarded as customised user settings.

Calculation of the average concrete strength value in the test zone
After the test procedure, the maximum and minimum values are not displayed, only the average
rebound value.

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5 Operation

5.1 Start a simple test

Individual measurements can be carried out immediately without further adjustment.
First press the On/Off key, the following is displayed:

0.00R 00.0 MPa
Then unlock the device as follows:

Place the device with the impact body (14) on a firm surface. Now press the device slowly against
the surface at a 90° angle.
At the same time, push the locking button (6) to release the lock. The impact body extends out of
the housing when you move the device backwards.

To carry out a measurement, place the extended impact body at a right angle to the concrete
surface.

Then press the device against the surface to be tested slowly but firmly.
The impact body is tensioned.
When the trigger position is reached, the impact body is released and strikes the surface.

- Caution! There is a serious risk of injury if handled incorrectly!

The measurement result is shown on the display as an R value and in MPa.

5.2 Test series in the measurement menu with default settings

After switching on the meter, press the Enter key twice to access the main menu.
The following line appears:
"Welcome and please take the next step"

Then use the arrow down key to select "Test mode setup" and confirm with "Enter".
Once you have made your entry, test mode is switched on and you cannot return to a higher level
of the selection menu without further ado.

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You can set the following values here:

- Component name: e.g. GJXX

- Number of test procedures: (16)

- Number of test zones: (16)

- Concrete type: e.g: GB standard-pumping (ready-mixed concrete)

- Test angle: e.g.: 0° (horizontal)

- Test direction: top (from above), bottom (from below), side (sideways)

- Carbonization depth: e.g. 0.0 mm (standard setting)
Once the setting has been completed, confirm it with "Enter" and return to test mode. The device

has automatically saved the measurement parameters.
An unfinished test can be continued after switching the device off and on again.
The test parameters can be changed during the test. To do this, press the Enter key to access
the main menu, then select "Test mode" and continue to the "Testing zone set" selection window.
When the set number of rebound tests has been made, the display shows "Testing zone is
completed" and the next test series can be started after a 3-second pause.

The test series is completed after the last test of the last test zone.
The tester then automatically switches to the evaluation area. You can then view the test ranges
and results in this area.

Concrete curve

Limit value alarm

Battery status

Measuring angle

Measuring scale

Test direction

Carbonization depth
MPa value

Rebound value

Measurement counter

Component no.

Test zone

00.0MPa

Name

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5.3 Calibration

Calibration is carried out to check the accuracy of the device and to correct it if necessary. For
this purpose, 16 test procedures must be carried out on a calibration unit intended for this
purpose.

After the 16th test procedure, press "Enter" to confirm. The determined value is displayed.
If the measured value of the device deviates too much from that of the calibration unit, see item
11 Appendix 1 - Troubleshooting.

5.4 Start new measurement

Use the arrow down key to select "New project" and confirm your selection with "Enter".
A new test series is created.
The default settings for the new test series are as described below:
Component name like G J X X X, e.g. G J 0 0 1
Number of tests like xx, e.g. 16
Number of test zones like xx, e.g. 16

5.5 Enter part name

In the "New part" menu item, use the arrow keys to select the "Part name" sub-menu and confirm
with "Enter" to enter the name. Set each individual digit using the arrow up key. There are 36
different options for each digit, from 0 - 9 and from A - Z.
Use the arrow down key to select the next digit.

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5.6 Enter the number of measurements in the test zone

Enter the number of tests (test time) in the "New part" menu item using the arrow keys. Use the
arrow key to select a number between 8 and 16 and confirm your selection with "Enter".

After completing the entry, confirm it with "Enter" and continue to the test area selection.

5.7 Test zone entry

There are 4 important parameters that need to be set here: the test angle, the direction of impact
to the surface, the depth of carbonization and the concrete strength curve.

5.7.1 Setting the test angle

There are 4 important parameters for the "Test zone". Use the arrow keys to select the test angle
and confirm with "Enter". A total of 9 different angles are possible here.
Confirm your selection with "Enter" and return to the parameter overview window.

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5.7.2 Enter test surface

In the entry menu for the measurement parameters of a new test zone, "Test zone setup", the
measurement directions can be selected using the arrow keys. Three measuring directions are
possible here: top surface, bottom surface, side surface.
Press "Enter" to confirm and return to the measurement parameter menu.

5.7.3 Setting the carbonization depth

In the selection menu for the "Carburized depth", the carbonization depth can be set within the
range from 0.0 to 6.0 mm, using the arrow keys. 13 different settings are possible here: 0.0 mm,

0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm,

6.0 mm.
Confirm your entry with "Enter" and return to the "Test zone setup" menu.

5.7.4 Setting the strength curve

In the "Strength curve" menu, use the up and down arrow keys to select the required concrete
strength curve. Then confirm the selection with "Enter". This will also take you back to the "Test
zone setup" menu.

Once the setting is complete, confirm it with "Enter" and return to measuring mode.

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5.8 Repeat test of the current test zone

Press "Enter" to return to the main menu. Then select "Test mode setup" and confirm with "Enter"
to access the selection window for the test mode. Select "Re-testing the current zone" and press
"Enter" to return to the test zone. The display is then reset to zero.

5.9 „Basic" measurement settings

Press "Enter" to access the main menu. Select "Test mode setup" and confirm with "Enter". Then
select "Basic measuring" and confirm with "Enter".

In this setting, only the measuring scale, the rebound value, the MPa value, the limit value alarm
and the battery level indicator are displayed on the LCD. In this setting, 100 rebound
measurements can be recorded at a time. This data can then be called up and displayed. When
the memory is full, a new file is automatically created.

Measuring scale

Battery status display
MPa value

Limit value alarm

Rebound value

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5.10 Review measurement data

Press "Enter" to access the main menu. Then select "Review data" and press "Enter" to access
the review menu.

1) Exit the current menu and call up the measurement menu

2) View part data

3) View the measured values of fully tested parts

4) View the measurement data of complete test zones

The data of the test zones of the last few tests are displayed on the LCD screen. The selection is
made using the arrow keys; the menu can be exited by pressing the "Enter" key.

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5.11 Delete measurement data

Press "Enter" to open the main menu. Then select "Memory" and confirm with "Enter" to access
the memory management.

You have the following options here:

- Exit: Exit the current menu item and switch to measurement view

- Delete current part No. xxx: Remove the data record for the current part

- Delete all data: Delete all saved data records

- Memory capacity: Display of the current memory capacity in per cent

0 ... 100 %; the total storage capacity is up to 1000 data records for components.

6 Data transfer

6.1 Set up data transfer

Press "Enter" to access the main menu. Then select "Data transfer" and confirm with "Enter". You
are now in the data transfer menu.

First connect the PCE-HT 224E to the PC using the mini-USB cable, then select the "Data transfer
mode" menu and select "Cable". The "Bluetooth" option for wireless connection is not available.
Selecting "Off" would switch off a Bluetooth connection.

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Then select "Send to PC". The message "Transferring" appears on the display. The device is now
ready for data transfer.

The software is intended for reading out and editing the test data of the PCE-HT 224 E concrete
test hammer. The test data can be read out and saved and reports can be created and printed
out.
System requirements: - a PC with USB interface

- Windows XP, Win 7, Win 8, NetFramework 2.0, Win 10
and higher

6.2 Establishing a connection to the PC

Carry out the following steps to connect the concrete test hammer to the PC.

1. Connect the two devices using the mini USB cable supplied.

2. Switch on the concrete test hammer and press the Enter key to access the main menu.
Select the menu item "Data Transfer" > "Data Transfer Mode" > "USB Cable".

3. Select "Data transfer" > "Send to PC". "Transferring" appears on the display and the
data transfer begins.

6.3 Driver installation

“Found new Hardware" appears on the computer screen when the concrete test hammer is
connected to the PC for the first time. Copy the drivers to the directory
X:/ Driver folder (software installation).
Install the "Digital Rebound Hammer" software by double-clicking on "Setup\setup.exe".

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6.4 Starting and exiting the PC software

Once the software has been successfully installed, a shortcut will automatically appear on the
desktop. Double-click on it to start the programme.

The main view of the software is in standard Windows format and contains the title bar, the menu
bar and the toolbar. The software can be used to analyse and document the measured
assemblies and components, e.g. as an attachment to acceptance reports.

Important: Once the software has been installed, activate the connection between the PC
and the rebound hammer via "CONNECT"!

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7 Main menu

7.1 Setting measuring units

Select the various units via the "Unit setup" menu.

7.2 Setting the upper / lower limit values

Set the upper and lower limit values via the "Upper-Lower limit setup" menu.

The upper and lower limit values of the rebound value (00 ... 60) are set here. Use the up and
down arrow keys to select the settings and confirm and save them with "Enter".

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7.3 Rights management, password settings

Under the "Rights management" menu item, you can activate or remove password protection or
change the password. The password is then valid for data retrieval, limit value entry and rights
management.
Use the arrow down key to move the pointer to the next letter, use the arrow up key to set the
numbers from 0 to 9 and then confirm with the Enter key.

7.4 Energy saving settings

In the "Power-saving mode setup" menu, select the desired settings using the arrow keys and
confirm them with "Enter".

In this menu item, you will find 3 selection options:
Normal energy consumption, i.e. approx. 8 - 10 hours operating time when the device is fully

charged

Reduced operation, energy consumption approx. 60 %; in this setting approx. 10 - 13 hours
operating time is common when the device is fully charged

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Economy mode, energy consumption approx. 30 %; approx. 13 - 16 hours operating time is
common in this setting when the device is fully charged

In the energy saving settings, you can switch back to the normal energy setting by pressing
"Enter". If you then press "Enter" again and then start the measurement, you will return to the
preset energy-saving modes.

7.5 Date setting

Set the date in the "Date of test setup" menu. To do this, press the arrow down key to move the
cursor to the right and use the arrow up key to set the current digit.

7.6 Setting the counter

Select the "Counter" setting. Here you can see the number of saved test procedures. You can
also reset the number of test procedures in this view. If you select "Clear" and confirm with "Enter",
the display is reset to zero.

7.7 Battery status display

The battery capacity is displayed in per cent (0 ... 100 %).

7.8 Instrument data (Info of Instrument)

Display of device data (serial number and firmware version)

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8 Calibration

After repair or service work, the device calibration can be checked in the "Calibration" setting. To
do this, use the up and down arrow keys to select the "Calibration" setting and confirm with
"Enter". Then carry out a total of 16 test procedures on a test anvil intended for this purpose. After
completing the 16 test procedures, confirm them with the Enter key.

The following is displayed:

The device is now calibrated and the display shows the zero position.

8.1 Completion of a test series

Once a test zone has been completed, the device automatically switches to the next test zone.
When all test zones have been measured, the device switches to the "Part test finished and take
next step" display area (completion of a test series). This completes the current series of
measurements.
You will see the menu items in the display: Review test part result, Review test zone result, New
part test, Re-testing the current zone.

In the "Review test zone result" view, the measurement results are displayed on the right-hand
side and the associated measurement parameters at the bottom left.

View results in the test area
In the "Review test part result" view, the test results of each test area can be seen on the right-

hand side of the display. The name and numbering can be found at the bottom left.

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9 Maintenance and servicing

Maintenance measures are important for the PCE-HT 224E concrete tester under the following
conditions.

• More than 2000 rebound tests

• Inconclusive test results

• Number of rebound tests performed unknown

Simple maintenance measures can be carried out as described below:

• Dismantle the untensioned hammer, open the upper housing by turning the knurled
screw at the upper (thick) end anti-clockwise and remove the rebound spring, the firing
pin and the measuring unit. To do this, you must also loosen the retaining nut at the
front end and remove the felt seal and the bearing shells. Then carefully remove the
guide rod with impact weight and impact body. To do this, gently push in the locking
hook and pull out the unit. Note the positions of the guide rails and the locks for
subsequent reassembly.

• Carefully clean all internal components with compressed air, then slightly oil the central
guide tube.
All other components must not be oiled.

• Clean the inside wall of the housing carefully. The holding torque of the locking unit
should be approx. 0.5 ... 0.8 Nm.

• The retaining nut (large knurled screw) must no longer be able to be turned; it must be
slightly tightened.

• Self-manufactured spare parts must not be used.

• After repairs have been carried out, a self-calibration must be performed (see also 5.3

Calibration). The rebound value should be 80 ±2.
Select the calibration function, then carry out the test procedure 16 times on the
corresponding calibration anvil in this setting. Then confirm with "Enter" to save the
calibration and exit this setting.

10 PC software

See chapter 6 Data transfer.

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11 Appendix 1 - Troubleshooting

If the display value suddenly stops changing during operation of the device or the rebound value
shows a large deviation, a mechanical fault has usually occurred. The troubleshooting options
are listed in the table below:

The replacement of parts or the mechanical repair of components may only be carried out by
authorised specialist personnel!

Error

Cause

Repair method

I

During the function
check, the signal
transmitter (22) blocks
at the starting point.

1. The distance
between the signal
generator (20), signal
transmitter (22) and
guide rail (26) is too
small.

Dismantle the signal transmitter
(22) and carefully change the
angle of the signal generator
(20).

2. The signal generator
(20) is broken.

Dismantle the signal transmitter
(22) and replace the signal
generator (20).

II

The signal transmitter
(22) is already pushed
up before the rebound
test and displays the
rebound value.

1. The contact angle
between the signal
generator (20) and the
signal transmitter (22) is
too large.

Dismantle the signal transmitter
(22) and carefully bend the
contact angle of the signal
generator (20) together.

2. The clearance
between the signal
transmitter (22) and the
guide rail (26) is too
large.

Remove the signal transmitter
(22) and set the frictional force
between the signal transmitter
(22) and the guide rail (26) (0.65
±0.15 N).

III

During the rebound
process, the signal
transmitter (22)
shakes, moves to a
certain point and
blocks there.

The signal transmitter
(22) rubs or jumps
against the housing
body.

Dismantle the signal transmitter
(22) and carefully smoothen the
guides with a small file.

IV

The impact weight
(10) triggers too early.

1. The retaining claw (3)
is blunt.

Sharpen the edge of the
retaining claw (3) with a file.

2. The detent on the
impact weight (10) is
broken/worn.

Change the angle of the impact
weight (10) or replace it.

V

The rebound device
cannot be pushed
back and the impact
weight (10) does not
move back.

1. The locking spring
(28) does not engage
and does not catch the
retaining claw.

Refit the locking spring (28) or
restore the tension and position
by bending it open.

2. The end of the
retaining claw (3) is
broken.

Replace the retaining claw (3).

3. The end of the
retaining claw (3) is
worn.

Carefully grind the retaining
claw (3) back into shape.

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VI

The impact weight
(10) is stiff or does not
release.

1. The thick end of the
retaining claw (3)
touches the surface of
the impact weight (10).

Grind 1 mm off the thick end of
the retaining claw (3).

2. The retaining claw (3)
is too sharp-edged.

Grind the catch hook of the
retaining claw (3) to the right
angle.

VII

The impact body (14)
does not move and
does not extend,
device does not work.

The locking button (6) is
loose, the small spring in
the inner part is not
working properly.

Hold one end of the coil spring
and twist the spring 30 times to
restore the tension. Then refit
the spring into the locking button
(6).

VIII

The rebound value is
relatively high.

1. The impact spring
(17) is longer than 61.5
mm.

Adjust the position of the impact
spring (17) in the guide bushing
(11).

2. The starting position
of the impact weight
(10) is relatively high.
The impact spring (17)
is too long.

Turn the adjusting bolt on the
back of the housing (30)
outwards.

3. There is too much oil
on the guide rod (9).

Dismantle the relevant
components of the rebound
body, clean them with a soft
cotton cloth and then slightly oil
them.

IX

The rebound value is
relatively low.

1. The impact spring
(17) is shorter than 61.5
mm.

Adjust the position of the impact
spring (17) on the guide bushing
(11).

2. The starting position
of the impact weight
(10) is relatively low.

Turn the adjusting bolt on the
back of the housing (30)
inwards.

3. The friction of the
signal transmitter (22) is
relatively high.

Set the distance angle between
the signal transmitter (22) and
the guide rail (26) accordingly
and set a friction value of 0.65
±0.15 N.

4. The impact weight
(10) is dirty.

Clean the impact weight
thoroughly.

5 The friction between
the impact weight (10)
and the guide rod (9)
increases.

Slightly oil the guide rod (9).

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X

The rebound value is
unstable and
fluctuates
significantly.

1. The contact surface
between the impact
weight (10) and the
impact body (14) is
uneven.

Rotate the impact body (14) by
180° or replace it.

2. The centre guide rod
(9) is dirty.

Dismantle and clean the device
and then oil it slightly.

3. The centre guide rod
(9) is bent.

Align the guide rod (9)
accordingly.

4. The friction between
the signal transmitter
(22) and the guide rail
(26) is not the same.

Adjust the friction between the
signal transmitter (22) and the
guide rail (26).

5. The contact between
the signal generator
(20) and the impact
weight (10) is poor.

Adjust the angle of the signal
generator (20) accordingly.

6 The guide rail (26)
rubs or strikes against
the housing body (7).

Carefully smoothen the surfaces
of the signal transmitter (22)
with a lapping stone; also
smoothen the guide channel on
the housing body if necessary.

7. The guide rail (26) is
bent.

Realign the guide rail.

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12 Appendix 2 - Conversion table for concrete strength

Rebound
value

Concrete compressive strength in MPa = N/mm²

for the direction of impact

top

horizontal

downwards

90°

60°

45°

30°

0°

-30°

-45°

-60°

-90°

20

10.3

10.3

10.3

10.3

10.3

13.1

13.7

14.3

14.9

21

10.3

10.3

10.3

10.3

11.4

14.3

14.9

15.5

16.2

22

10.3

10.3

10.3

10.3

12.5

15.4

16.0

16.7

17.4

23

10.3

10.3

10.3

10.4

13.7

16.7

17.4

18.0

18.8

24

10.3

10.3

10.5

11.6

14.9

17.9

18.6

19.3

20.0

25

10.3

10.8

11.6

12.7

16.2

19.2

20.0

20.8

21.5

26

11.0

12.0

12.8

14.0

17.5

20.6

21.4

22.1

22.8

27

11.9

13.3

14.0

15.3

18.9

22.1

22.8

23.6

24.5

28

13.4

14.6

15.4

16.7

20.3

23.5

24.3

25.0

25.9

29

14.8

16.0

16.7

18.0

21.8

25.0

25.9

26.7

27.6

30

16.2

17.5

18.2

19.6

23.3

26.5

27.4

28.2

29.1

31

17.6

18.9

19.6

21.0

24.9

28.2

29.1

30.0

30.9

32

19.1

20.8

21.2

22.7

26.5

29.8

30.7

31.6

32.5

33

20.8

22.0

22.7

24.5

28.2

31.6

32.5

33.5

34.4

34

22.4

23.6

24.5

26.0

30.0

33.3

34.2

35.2

36.1

35

24.1

25.2

26.0

27.8

31.8

35.2

36.1

37.1

38.2

36

25.9

27.1

27.9

29.6

33.6

36.9

37.9

38.9

39.9

37

27.8

28.8

29.6

31.6

35.5

38.9

39.9

41.0

42.0

38

29.6

30.7

31.6

33.5

37.5

40.7

41.8

42.8

43.9

39

31.6

32.5

33.5

35.4

39.5

43.7

43.9

45.0

46.1

40

33.6

34.6

33.5

37.5

41.6

44.8

45.9

47.0

48.1

41

35.5

36.5

37.5

39.5

43.7

47.0

48.1

49.2

50.4

42

37.7

38.7

39.7

41.8

45.9

49.0

50.2

51.3

52.5

43

39.7

40.7

41.8

43.9

48.1

51.3

52.5

53.6

54.8

44

42.0

43.0

44.1

46.3

50.4

53.4

54.6

55.8

57.0

45

44.1

45.2

46.3

48.5

52.7

55.8

57.0

58.2

59.5

46

46.5

47.6

48.7

51.0

55.0

58.0

59.2

60.0 47

48.7

49.9

51.0

53.4

57.5

48

51.3

52.5

53.6

56.0

60.0

49

53.6

54.8

56.0

58.5 50

56.8

57.5

58.8

60.0

© PCE Instruments

25

13 Contact

If you have any questions, suggestions or technical problems, please do not hesitate to contact
us. You will find the relevant contact information at the end of this user manual.

14 Disposal

For the disposal of batteries in the EU, the 2006/66/EC directive of the European Parliament
applies. Due to the contained pollutants, batteries must not be disposed of as household waste.
They must be given to collection points designed for that purpose.

In order to comply with the EU directive 2012/19/EU we take our devices back. We either re-use
them or give them to a recycling company which disposes of the devices in line with law.

For countries outside the EU, batteries and devices should be disposed of in accordance with
your local waste regulations.

If you have any questions, please contact PCE Instruments.

© PCE Instruments

26

PCE Instruments contact information

Germany France Spain

PCE Deutschland GmbH PCE Instruments France EURL PCE Ibérica S.L.
Im Langel 26 23, rue de Strasbourg Calle Mula, 8
D-59872 Meschede 67250 Soultz-Sous-Forets 02500 Tobarra (Albacete)
Deutschland France España
Tel.: [phone] Téléphone: [phone] Tel. : [phone]
Fax: [phone] Numéro de fax: [phone] Fax: [phone]
[e-mail] [e-mail] [e-mail]
www.pce-instruments.com/deutsch www.pce-instruments.com/french www.pce-instruments.com/espanol

United Kingdom Italy Turkey

PCE Instruments UK Ltd PCE Italia s.r.l. PCE Teknik Cihazları Ltd.Şti.
Trafford House Via Pesciatina 878 / B-Interno 6 Halkalı Merkez Mah.
Chester Rd, Old Trafford 55010 Loc. Gragnano Pehlivan Sok. No.6/C
Manchester M32 0RS Capannori (Lucca) 34303 Küçükçekmece - İstanbul
United Kingdom Italia Türkiye
Tel: [phone] Telefono: [phone] Tel: [phone]
Fax: [phone] Fax: [phone] Faks: 0212 705 53 93
[e-mail] [e-mail] [e-mail]
www.pce-instruments.com/english www.pce-instruments.com/italiano www.pce-instruments.com/turkish

The Netherlands United States of America Denmark

PCE Brookhuis B.V. PCE Americas Inc. PCE Instruments Denmark ApS
Institutenweg 15 1201 Jupiter Park Drive, Suite 8 Birk Centerpark 40
7521 PH Enschede Jupiter / Palm Beach 7400 Herning
Nederland 33458 FL Denmark
Telefoon: [phone] USA Tel.: [phone]
[e-mail] Tel: [phone] [e-mail]
www.pce-instruments.com/dutch Fax: [phone] www.pce-instruments.com/dansk
[e-mail]
www.pce-instruments.com/us