Waygate Technologies DynaPOCKET Operating Manual

DynaPOCKET

Technical Reference and Operating Manual

Ident-No. 28 674

Content

This Issue 03, 04/2005 applies to the software version V 01.01.01
The software version is indicated in the display (ref. chapter 3.3).

Subject to change without notice.

0-2 Issue 03, 04/2005 Krautkramer DynaPOCKET

Content

1 Introduction ...................................... 1 -1

1.1 Safety information .................................. 1 -2

Batteries ................................................... 1 -2

Software ................................................... 1 -2

1.2 About this manual .................................. 1 -3

Important information ................................ 1 -3

1.3 Layout and presentation in this manual 1 -4

Attention and note symbols ...................... 1 -4

Listings ..................................................... 1 -4

Operating steps ........................................ 1 -4

1.4 Prerequisites for hardness testing ......... 1 -5

Operator training ....................................... 1 -5

Technical test requirements ...................... 1 -6

Choice of the appropriate test equipment .. 1 -6

1.5 Krautkramer DynaPOCKET ..................... 1 -7

1.6 Important information about hardness

testing using the DynaPOCKET ............. 1 -9

Test material ............................................. 1 -9

The rebound method ................................. 1 -9

Conversion of hardness values ............... 1 -10

2 Scope of supply and accessories .. 2 -1

2.1 Scope of supply ...................................... 2 -3

2.2 Recommended accessories ................... 2 -5

2.3 Spare parts requirements ....................... 2 -6

3 Operation .......................................... 3 -1

3.1 Preparation .............................................. 3 -2

Inserting batteries ..................................... 3 -2

3.2 Fundamental principles of operation .... 3 -3

Display and keys ...................................... 3 -3

How to handle the impact device .............. 3 -5

3.3 Hardness measurement .......................... 3 -6

Switch-on .................................................. 3 -6

Switch-off ................................................. 3 -6

Carrying out a measurement ..................... 3 -6

Closing a measurement set ...................... 3 -7

Deleting measured values ......................... 3 -7

Krautkramer DynaPOCKET Issue 03, 04/2005 0-3

Content

3.4 Selecting instrument settings ................ 3 -8

Setup mode .............................................. 3 -8

Measurement mode and

display of measured values ...................... 3 -8

Material group ........................................... 3 -9

Hardness scale ....................................... 3 -10

Conversion .............................................. 3 -11

4 Maintenance and care ...................... 4 -1

4.1 Care ......................................................... 4 -2

Caring for the instrument ........................... 4 -2

Caring for rechargeable batteries ............... 4 -2

Charging the batteries ............................... 4 -2

How to handle alkaline batteries ................ 4 -3

4.2 Maintenance ............................................ 4 -3

Impact device ........................................... 4 -3

5 Function check and

troubleshooting ................................ 5 -1

5.1 Checking the function ............................. 5 -2

5.2 Troubleshooting ...................................... 5 -2

Error codes ............................................... 5 -3

6 Technical data .................................. 6 -1

Housing .................................................... 6 -2

Display and keypad .................................. 6 -2

Power supply and operating time ............... 6 -3

Ambient conditions ................................... 6 -3

Evaluation ................................................. 6 -4

0-4 Issue 03, 04/2005 Krautkramer DynaPOCKET

Content

7 The rebound hardness testing

method .............................................. 7 -1

7.1 The hardness testing method ................ 7 -2

7.2 Conversion of hardness values .............. 7 -3

Material groups ......................................... 7 -4

Application ranges of the conversion tables . 7 -5

7.3 The treatment of test material ................ 7 -6

Surface quality .......................................... 7 -6

Curved surfaces........................................ 7 -6

Measurements on small objects ............... 7 -6

Minimum wall thicknesses ........................ 7 -6

7.4 Information about the

statistical evaluation ............................... 7 -8

8 Annex ................................................ 8 -1

8.1 EU declaration of conformity ................. 8 -2

8.2 Manufacturer/Service addresses ............ 8 -2

9 Index .................................................. 9 -1

Krautkramer DynaPOCKET Issue 03, 04/2005 0-5

0-6 Issue 03, 04/2005 Krautkramer DynaPOCKET

Introduction 1

Krautkramer DynaPOCKET Issue 03, 04/2005 1-1

Introduction Safety information

1.1 Safety information

The DynaPOCKET is designed and tested according to
DIN EN 61 010 Part 1, March 1994, “Safety require­ments for electric measuring, control and laboratory
equipment“, and was technically in perfectly safe and
faultless condition when leaving the manufacturing
works.

In order to maintain this condition and to ensure a safe
operation, it is absolutely necessary that you read the
following safety information before putting the instru­ment into operation.

A Attention:

The DynaPOCKET is an instrument for materials
testing. Any use for medical applications or other
purposes is not permitted!

The instrument may only be used in industrial
environments.

Batteries

The DynaPOCKET can be operated with AAA-sized
AlMn cells or rechargeable NiCads and NiMH batteries.

NiCads or NiMH batteries can not be charged within
the instrument. They must be charged with a specifi­cally approved external battery charger.

For information on how to properly handle the batteries,
please refer to chapter 4

Maintenance and care

.

Software

According to the present state of the art, software is
never completely free from errors.

Before using any software-controlled test equipment,
you should ensure that the required functions operate
perfectly as intended.

If you have any questions about the use of your test
equipment, please contact your local GE Inspection
Technologies representative.

1-2 Issue 03, 04/2005 Krautkramer DynaPOCKET

About this manual Introduction

1.2 About this manual

In the following section you will learn how to use this
manual. Please read through these instructions care­fully carefully to operate all functions of the
DynaPOCKET quickly and reliably.

This will enable you to take full advantage of the
instrument’s capabilities. Also, you will avoid any incor­rect test results due to malfunctions or operating er­rors. Such incorrect test results may cause personal
injuries or material damages.

Important information

Even if you should be familiar with hardness testing
methods, please review the information in the chapters

1.4, 1.5 and 7.

In chapter 1.4, you will find important limitations and
prerequisites for hardness testing in general (training,
knowledge of the specific technical test requirements
and limits, choice of the appropriate test equipment).

In chapter 1.5, you will find complete information about
hardness testing using the DynaPOCKET that must
always be followed to ensure correct measurement
results.

Chapter 7 describes the rebound hardness testing
method.

Krautkramer DynaPOCKET Issue 03, 04/2005 1-3

Introduction Layout and presentation in this manual

1.3 Layout and presentation in
this manual

To make it easier for you to use this manual, all opera­ting steps, notes, etc. are always presented in the same
way. This will help you find individual pieces of informa­tion quickly.

Attention and note symbols

A Attention:

The Attention symbol indicates peculiarities and
special aspects in the operation which could affect the
accuracy of the results.

H Note:

Note contains e.g. references to other chapters or

special recommendations for a function.

Listings

Listings are presented in the following form:

❚ Variant A

❚ Variant B

❚ ...

Operating steps

Operating steps appear as shown in the following
example:

– Position the DynaPOCKET vertically to the

surface to be tested.

– Use your thumb to press the release button.

1-4 Issue 03, 04/2005 Krautkramer DynaPOCKET

IntroductionPrerequisites for hardness testing

1.4 Prerequisites for hardness
testing

This operating manual contains all essential informa­tion on how to operate the DynaPOCKET. In addition,
there are a number of factors which affect the results.
A description of these factors would go beyond the
scope of an operating manual. The following list there­fore contains only the three most important conditions:

❚ operator training

❚ knowledge of special technical test requirements

and limits

❚ choice of the appropriate test equipment

A Attention:

Lack of knowledge of the above-mentioned subjects
may lead to incorrect test results and thus have un­foreseeable consequences.

Operator training

The reliable and safe operation of a hardness testing
device requires a proper training in the field of materi­als testing.

A proper training comprises for example adequate
knowledge of:

❚ hardness testing on metallic materials,

❚ effects due to material properties, especially due to

the microstructure, on hardness testing and on the
corresponding choice of the appropriate hardness
tester,

❚ limits relating to the use of conversion of different

hardness values such as Vickers, Rockwell and
Brinell,

❚ effects of surface finish on the hardness value,

❚ effects of the test load on the determined hardness

value.

Krautkramer DynaPOCKET Issue 03, 04/2005 1-5

Introduction Prerequisites for hardness testing

Technical test requirements

Every hardness test is subject to specific technical
test requirements. The most important ones are :

❚ definition of the scope of test

❚ choice of the appropriate test method

❚ consideration of material properties

❚ determination of limits for evaluation

Choice of the appropriate test equipment

It is the task of those with overall responsibility for
testing to ensure that the inspector is fully informed
about the technical test requirements. Moreover, a
clear and thorough interpretation of the corresponding
test specifications is absolutely necessary.

Information about test methods and test specifications
may be obtained, for example, from various institutions,
industrial enterprises and authorities.

1-6 Issue 03, 04/2005 Krautkramer DynaPOCKET

IntroductionKrautkramer DynaPOCKET

1.5 Krautkramer DynaPOCKET

The Krautkramer DynaPOCKET is a handy and easy­to-use rebound hardness tester enabling the user to
carry out tests quickly and effortlessly.

You can use the DynaPOCKET to carry out measure­ments anywhere and in any direction; the direction
does not have to be set in advance.

The DynaPOCKET is mainly suitable

❚ for measuring the hardness of low-alloy or unalloyed

steels,

❚ for measuring the hardness of high-alloy steels,

❚ for measuring the hardness of nonferrous metals.

The DynaPOCKET operates according to the rebound
method (according to ASTM standard A 956). In this
method, an impact body is impelled against the test
surface by spring force.

Impact and rebound speeds are measured in non-con­tact mode and the hardness value is calculated on the
basis of these two measurements. The hardness value
is immediately displayed. Apart from this, a high repro­ducibility of the test results is ensured.

The DynaPOCKET has only two operating keys to
carry out all functions.

The large display indicates the current single value or
the statistical average of a measurement set, depend­ing on the selected mode.

Krautkramer DynaPOCKET Issue 03, 04/2005 1-7

Introduction Krautkramer DynaPOCKET

1 Release button

2 Loading tube

3 Operating keys

4 Display

5 Impact device with test attachment

1-8 Issue 03, 04/2005 Krautkramer DynaPOCKET

Important information about hardness testing using the DynaPOCKET Introduction

1.6 Important information about
hardness testing using the
DynaPOCKET

The following section contains a summary of the most
important technical test requirements that you always
have to observe in order to obtain reliable and repro­ducible measurement results.

Test material

Surfaces must be free from any impurities (oil, dust,
rust, etc.). Rough surfaces lead to a greater variation
of the single values. If necessary, prepare rough sur­faces, using our grinding set MIC 1060 (ref. chapter 2).

Test objects having a mass of at least 5 kgs can be
tested without any additional supports; objects weigh­ing less require a support to which they have to be
tightly coupled. Please use large, inflexible and rigid
metal supports for this purpose.

The test objects should have a minimum wall thick­ness of 20 mm. We recommend the use of the UCI
hardness tester MIC 10 for test objects having thinner
wall thicknesses.

A Attention:

A yielding or springiness of the test objects may lead
to measuring errors! Please also refer to chapter 7.3.

The rebound method

The rebound method is a dynamic method with a very
high reproducibility of the measurements. The rebound
method does not replace the classical Brinell hardness
testing or other standardized methods, but rather
complements them.

The remaining energy of an impact body is measured
after rebounding from the material surface. Please ob­serve that the loss of energy is also effected by the
material’s mechanical properties, i.e. mainly on its
modulus of elasticity or Young’s modulus.

The direct comparison with results obtained from stan­dardized hardness measurements on specific materials
is therefore important for the evaluation of the measur­ing accuracy of the rebound method.

Krautkramer DynaPOCKET Issue 03, 04/2005 1-9

Introduction Important information about hardness testing using the DynaPOCKET

A Attention:

It is absolutely necessary that you set your
DynaPOCKET to the appropriate material group
before testing (ref. chapter 3.4).

The material group for low-alloy or unalloyed steel is
defined as default setting in the instrument.

Please also read chapter 7 on the rebound method.

A Attention:

You should not carry out hardness measurements
twice at the same test position, otherwise faulty mea­surements are possible due to the surface hardening.
The distance between the test positions should be at
least 3 mm.

Conversion of hardness values

The conversion of the HL value determined according
to the rebound method into standard hardness scales
is carried out on the basis of defined conversion tables
depending on the material group.

The conversion into tensile strength values is made
according to DIN 50150 on the basis of the HB values.

You should carry out conversions only

❚ if the specified test method cannot be applied (for

example because there is no suitable instrument
available),

❚ if it’s not possible to section the part to perform the

specified test method.

Please observe the limitations regarding the conver­sion into DIN 50150.

A Attention:

Any illegal or unacceptable conversions may lead
to grave errors in the interpretation of measure­ment results.

1-10 Issue 03, 04/2005 Krautkramer DynaPOCKET

Scope of supply and accessories 2

Krautkramer DynaPOCKET Issue 03, 04/2005 2-1

Scope of supply and accessories Scope of supply

This chapter informs you about the scope of supply in
our standard package and the accessories available for
the DynaPOCKET.

It describes

❚ accessories included in the scope of supply of our

standard package

❚ recommended accessories

❚ spare parts requirements

2-2 Issue 03, 04/2005 Krautkramer DynaPOCKET

Scope of supply Scope of supply and accessories

2.1 Scope of supply

Product name Description Order no.

DynaPOCKET Plus DynaPOCKET Plus – Portable hardness tester 35 158

according to the rebound method with an integrated
impact device D and digital display of the
measured value in HV, HB, HRB, HRC, HS, HL or
N/mm², including hardness reference block

consisting of:

Basic instrument DynaPOCKET 35 159

Hardness reference block MIC D 62 34 394

Operating manual German/English 28 674

Quick Reference Guide German/English 28 675

Transport case 09 554

Cleaning brush 34 420

2 AlMn batteries (type AAA) 100 612

Test attachment dia. 13.5 mm 34 656

Krautkramer DynaPOCKET Issue 03, 04/2005 2-3