Rohmann Newsletter 13 Eddy-Current-Test Instruments and Test ...

Wirbelstrom-Prüfgeräte und -Systeme • Eddy Current Instruments and Systems 

CONTROL 2012 

CONTROL is being held again in Stuttgart from May 8th to the 11th. This trade fair has been 

around for 26 years already and we have been presenting our test devices there since that time. 

The trade fair began in Sindelfingen with 97 presenters that year when the subject of quality 

assurance was not yet really an issue. That has permanently changed. Today we are one of over 

800 exhibitors at the trade fair and over 24,000 trade visitors from 88 countries prove the high 

value of quality assurance and this event. 

The rapid growth of our business enables us to present a small highlight at CONTROL nearly 

every year. This year we presented the compact EC15 rotor. Designed for non-contact crack 

detection on wires, this rotor‘s small dimensions and low weight allow it to be used in the 

interesting field of handling machines, e.g. for the testing of cylindrical parts (see the reports on 

pages 5 and 6). 

There was a great amount of interest so we were able to take some of the inquiries regarding 

this topic back home with us. 

Just like every year, this year many visitors once again took advantage of the opportunity to discuss 

their testing tasks with us, presented us with their smaller and larger task assignments, and 

were very often able to leave the booth with a verifiable response regarding their feasibility. 

Once or twice we heard visitors say, „This already made the visit to the trade fair worthwhile for 

us!“ That means that this year‘s appearance at CONTROL can once again be considered a success. 

Alexander v. Hornhardt, Rohmann GmbH 

Rohmann GmbH 

Rohmann Newsletter 13 

CONTENT 

Eddy-Current-Test Instruments and Test Systems 

Page 1 - CONTROL 2012 

Page 2 -4 - Separators 

Page 5 - Rotor EC 15 

Page 6 - Application 

Page 7 

- Agents Meeting 2102 

Page 8 

- TUBE & WIRE 2012 

Page 9 

- Rohman UK in Singapore 

Page 10 

- ET-Trainings/Exhibitions 

Page 11 

- Multiplex-technology 

Page 12 - Contacts 

ISSUE 13, Juni 2012


Products 

Length of pieces (mm) 

TwinSort twin sorting separator 

Switch size 

Speed up 0.8 sec/piece up 1.2 sec/piece 

Separation control 

Maximum size of cylindrical test pieces 

The separator can be connected directly to the: 

Diameter of pieces (mm) 

ELOTEST IS500 ELOTEST PL500 


The sorting separators of our partner N-DECT GmbH are designed with integrated control and monitoring systems for 

long-term operation as part of a production line. 

Power is supply by means of an integrated 24-volt DC adapter in the ELOTEST PL500 or ELOTEST IS500. 

Separation control is also integrated. 

The positions of the stopper and separator are monitored by means of a proximity switch. 

The sorting coil is installed directly on top of the sorting mechanism. 

The separator construction enables parts subject to wear and tear to be easily replaced. 

The separator weighs 2 kg. 

2


Products 

Length of pieces (mm) 

NovoSort 9-part sorting separator 

Speed 

Separation control 


The sorting separators of our partner N-DECT GmbH are designed with integrated control and monitoring systems for 

long-term operation as part of a production line. 

Power is supply by means of an integrated 24-volt DC adapter in the ELOTEST PL500 or ELOTEST IS500. 

Separation control is also integrated. 

The positions of the stopper and separator are monitored by means of a proximity switch. 

The sorting coil is installed directly on top of the sorting mechanism. 

The separator weighs 2 kg. 

The separator can be connected directly to the: 

Individual customization and special designs possible! 

Maximum size of cylindrical test pieces 

Diameter of pieces (mm) 

up 0.9 sec/piece 

ELOTEST IS500 ELOTEST PL500 

3


Products 

Schematic diagram TWINSORT 15 

Schematic diagram NovoSort 12 

Sorting separators 


4


Products 

Compact rotor EC15/1-1 

Compact rotor EC15 


Compact high-performance rotor for the non-contact testing of round materials, such as wires, rods and 

pipes with dimensions ranging from 1.5 – 15 mm, are able to pass through it. 

Constructed in a high-strength anodized aluminum housing, this rotor serves to record longitudinal and 

transverse defects with longitudinal components starting from a defect depth of 20 µ. 

Its compact construction allows the rotor to be very easily integrated into existing test tracks or transport 

lines. The median throughput height is 35 mm. 

The fixed RD rotor or adjustable RDE rotor test nozzles are available for testing the entire dimensional range 

from 1.5 – 15 mm. 

The width of the test track will be defined by sensors adapted according to the task definition. 

The rotor with dirt protection (labyrinth seal), precision bearings and non-contact, maintenance-free test 

signal transmitters is operated at 3,000 rpm. It is driven by a 24-volt motor. 

Technical Data: 

Rotor speed: 3,000 rpm (optionally 6,000 rpm) 

Testing diameter: 1.5 mm – 15 mm depending on model 

Drive: 24V/9 A 

Housing material: anodized high-strength aluminum 

optional: 

Base plate for installation; protection nozzle with retainers; customerspecific 

customizations 

Guiding nozzles: Peek, high-strength and temperature-resistant, 

centering and ball centering 

installation and disassembly do not require tools 

Probes: depending upon the testing task 

Versions: 1.) Test probe 1 – 1 channel with A compensation 

2.) Test probes 1 and 2 – 2 channels without A compensation 

Dimensions : L= 120 mm, B= 70 mm, H= 138 mm 

5


Application - 


System for eddy current crack detection on cylindrical parts 

using ELOTEST PL500 

Throughput rate: 

10 parts/second, maximum conveyor 

speed 100 mm/s, optionally faster. 

Spectrum of parts: 

Standard 1.5 mm < Ø < 5 mm, 5 < l < 30 mm, 

optionally longer and up to Ø 10 mm 

Typical defect specification: 

Longitudinal cracks 0.05 mm deep x 0.05 mm wide x 

3.0 mm long 

The parts are fed in the line, e.g. using a vibratory feeder. 

The line of parts is clamped between drive wheels 

and brake wheels and thereby precisely and evenly fed 

through the rotating head. 

The overlaying of the rotational movement of the 

probes and the progressive advance of the line of 

parts monitored by encoders create a screw-shaped 

test track on the test pieces. This allows their lateral 

surfaces to be scanned for surface defects without gaps 

or contact.After the brake rolls, the test pieces separate 

from the line and fall individually into the subsequent 

sorting switch which sorts to BAD (defective) in its 

home position and is monitored in both its GOOD 

(non-defective) as well as BAD position.The switch will 

only be actively switched to the GOOD position if there 

is a positive evaluation of all of the monitored parameters 

and the test result is OK. 

The good parts are counted and fed into a monitored 

container as bulk goods. When 90% of the adjustable 

target number of pieces is reached, the operator receives 

an advance warning on the panel and signal light. 

The systems stops when the target number of pieces 

is reached.The system can also be equipped with an 

optional container changer.Even at full testing speed, 

defective (BAD) parts will be fed individually into a 

monitored container as bulk goods.The number of 

defective parts is recorded and an advance warning is 

given when 90% of the preset target number of pieces 

is reached in this case as well.It is possible to switch the 

containers without stopping the system.The system will 

Eddy Current System for sorting 

stop if one or more of the containers are missing. 

It is typically possible to modify the system to other 

diameters in less than 15 minutes. The tools and interchangeable 

parts are clearly organized and stored 

in the integrated drawer cabinet.All of the system‘s 

movements and functions are monitored and can be 

controlled using the color panel. Part types and their 

specific parameters can be saved in the control system 

and selected on the panel for fast part-type adjustment. 

Error messages are displayed on the panel in clear text 

along with measures for resolving them. 

The system is designed for unmanned operation. The 

constructive measures and the careful selection of the 

components used minimized the amount of servicing 

required while simultaneously providing the maximum 

service life. 

Jens Geiger, n-dect 

6


Events 

Gruppenfoto von der Vertretertagung 2012 

2012 Representatives‘ Conference 

Representatives from China to Mexico accepted our 

invitation to the 2012 International Representatives‘ 

Conference (Vertretertagung 2012) held in Frankenthal 

from February 28th to March 1st, 2012. 

The extensive program enabled representatives to 

learn about new innovations. Devices, sensors, software 

developments and their associated diverse testing 

options were presented in detail and discussed. Many 

representatives reported on their testing tasks thereby 

enabling the other representatives to gain a comprehensive 

glimpse into their work and provided ideas on 

how their own applications can be solved. 

Practical experience could be gathered on the 3rd day. 


The device training enabled the practical implementation 

of the large amount of information collected during 

the first two days. Many unresolved questions were 

answered in this manner. The comprehensive presentation 

of the test devices, the detailed explanation of the 

different setting options, and the immediate practical 

application formed the conclusion of the representatives‘ 

conference. 

The positive feedback from the participants and the numerous 

inquiries regarding a continuation of the event 

speak for themselves. 

We are pleased to have hosted a successful representatives‘ 

meeting and would like to thank all of the participants 

for their involvement. 

Annett Wieduwilt, Rohmann GmbH 

7


Events 

Booth of the TUBE & WIRE 2012 

TUBE & WIRE 


The TUBE & WIRE trade fairs will be held in Düsseldorf from March 26th to the 30th, 2012. Over 1,300 exhibitors presented their 

products at the WIRE trade fair alone. This year we will be presenting our products at the WIRE trade fair in Hall 16, putting us in 

the direct vicinity of the FASTENER and SPRING product groups within the WIRE trade fair. This is just the right place for the first 

presentation of the new EC15 rotor and the new sorting system. The TwinSort and NovoSort sorting separators (see pages 2 - 4 of 

the report) received a great deal of attention. Our presentation of NovoSort, a 9-part separator, in action was just as successful as 

our presentation of the EC15 and EC30 rotor systems in combination with encircling coils. The test devices we were able to present 

included our ELOTEST IS500 and ELOTEST PL500 inline device family. 

With a few interruptions we have been an exhibitor at the TUBE & WIRE trade fairs again and again. This year was the best so far, 

however. A great amount of interest could be felt from visitors as well as other exhibitors. Many of them are already customers of 

ours and more than a few people became interested potential customers at our booth. 

All in all we can only say that WIRE 2012 was once again a very successful trade fair! 

Alexander v. Hornhardt, Rohmann GmbH 

8


Events 

Simon Barnes in action 

During a sales visit to SE Asia region, Simon Barnes of 

Rohmann UK was invited to make presentation to the 

NDT Society of Singapore on 11th May 2012. The 

chosen topic was ‘Robotic EC Inspection System for 

Commercial and Military Engine Components’. 

The opportunity was taken to give an overview of 

Rohmann GmbH to the attendees. This covered the 

founding of the company in Beindersheim through to 

the construction of the company buildings including the 

newest building at Carl-Benz-Str in Frankenthal. The 

key members of the Rohmann family were ‘introduced’ 

and the emphasis that that Rohmann remains a family 

business and will continue to be so. 

The product range from probes and sensors through to 

in-line systems were also presented to the broad NDT 

industry audience. 

The main presentation covered the development of the 

EloScan system; the important features and components 

that make up this fully integrated inspection system. An 

overview of the newest features of xml sequencing and 

CAD/CAM data transfer and simulation was described. 

A short movie of the EloScan system in operation was 

then given and narrated by Simon Barnes. At the 

Singapore NDT Society 

Simon Barnes got the certificate 


conclusion of the movie, a question and answer session 

opened up some interesting points but not only about 

the EloScan. 

At the end of the presentation, Simon Barnes was 

presented with a Certificate by Dr B S Wong, as an 

expression of the appreciation of the Singapore NDT 

Society. 

Simon Barnes, Rohmann UK 

9


EDDY CURRENT LEVEL 1 & 2 TRAINING IN FRANKENTHAL 

REGISTER NOW AT: WWW.VECTOR-TUB.DE 

Where safety is important, questions are asked of experts, 

experts who guarantee stability, durability loading capacity 

and therefore safety. 

Since 1993 SECTOR Cert GmbH has qualified and certified 

non-destructive testing experts. SECTOR Cert offers industries 

highly respected certification through the use of a Europe-wide 

network of training and testing centers, continuous checks 

on the network partners as well as the special practical-oriented 

training and testing. So; only those who are certified are 

qualified! 

In co-operation with Rohmann GmbH, VECTOR and SECTOR 

Cert GmbH are holding eddy current level 1 and 2 training 

and exams 1+2 in Frankenthal. 

Course content: 

• The difficult part of level 1 training is the basics of behavior 

of magnetic induction, eddy current technology and 

impedance plane display. 

• Intensive familiarisation with generic and special instruments. 

• An overview of industrial applications including pressure 

tank manufacture, tube production and aviation. 

• For participants from all industries material sorting is 

covered. 

CONTROL 2012, Stuttgart, GERMANY 

8. - 11. March 2012 

INNOTRANS, Berlin, GERMANY 

18. - 21. September 2012 

HK Wiesbaden, GERMANY 

10. - 12. October 2012 

Testxpo, ZWICK, Ulm, GERMANY 

15. - 18. October 2012 

ASNT Fall Conference, Orlando, FL, USA 

29. Oktober - 2. November 2012 

Metalex, Bangkok, Thailand 

21. - 24. November 2012 

Exhibition Dates 2012 

Training Dates 2012: 

Kurs E1-110: 23.01. - 01.02.2012 

Kurs E3-262: 21.05. - 26.05.2012 

Kurs E1-112: 11.06. - 20.06.2012 

Kurs E2- 69: 08.10. - 17.10.2012 


Please check our home page for the dates of the practical training and exams 

Prices: 

Level 1: (5 Day course) 1.250, – EUR 

Level 2 (5 Day Course) 1.250, – EUR 

Practical training with exam preparation (2 Days) 660,–EUR 

Exams Level 1 or 2 + Certificate + Licence (1 Day) 710, – EUR 

Register at: 

VECTOR GmbH 

Frau Britta Rademacher 

Am Walzwerk 17 

45527 Hattingen 

Tel: 02324.919820 

Fax: 02324.9198209 

Mail: info@vector-tub.com 

www.vector-tub.com 

Rohmann GmbH booth at CONTROL 2012 in Stuttgart 

10


Software 


Cutting costs through the most advanced multiplex technology 

Have you ever watched a round of simultaneous chess? Then 

you have experienced a visible example of multiplex technology. 

One individual player plays against a series of opponents 

at the same time. The player does this by switching to the next 

opponent after each move. Naturally the chess master must 

be an excellent player in order to be able to not only quickly 

decide the next move but also to keep all of the simultaneous 

games in mind and to know what their current status is. 

That is precisely how multiplexing works in the modern eddy 

current test devices in the V5 series such as the ELOTEST 

PL500 and ELOTEST IS500. The devices can switch from one 

set of parameters to the next very quickly (in 4 microseconds) 

and can remember up to 32 (ELOTEST PL500) or 8 (ELOTEST 

IS500) sets of parameters at the same time. Together with a 

probe multiplexer, they can also switch between the test probe 

or coil. The result is that they can operate multiple probes 

with just one test channel in order to really save money. An 

excellent testing speed can still be achieved in many testing 

situations despite this fact because the digital test devices of 

this family are based on the most advanced FPGA technology 

and can therefore perform multiplex operations as quickly as 

physically possible. 

Optimally adapted to the test problem, the devices can be 

configured in various multiplex operation types. We would like 

to take this opportunity to briefly present the most important 

ones to you: 

Parameter multiplex 

Normally the test devices in the V5 series switch between 

entire sets of parameters in the multiplex. A test piece can 

therefore be inspected using multiple test frequencies in the 

frequency multiplex, for example. This technology is standard 

for use with screening inspection (material mix, joints, etc.) 

with up to 8 frequencies. The devices can also be equipped 

with a sorting channel module for screening inspection that 

provides additional important automated functions in order to 

be able to set up such an inspection quickly and securely. We 

have given this type of operation, commonly known as frequency 

multiplex, the name „parameter multiplex“ because the 

fast FPGA technology allows it to switch not only between test 

frequencies but nearly the entire set of parameters. Testing can 

also be carried out using different filter settings, for example. 

Probe multiplex 

In addition to the parameter multiplex, switching between the 

test probe or coil is also possible with the aid of a probe multiplexer. 

The probe multiplexer can even be already installed 

in the channel module for up to two probes. Those who want 

to multiplex more than two probes will require additional 

multiplexer hardware that is available in different models. The 

parameter multiplex is always running along with it so that 

each probe receives its own complete set of parameters. The 

probes can therefore be operated using different frequencies, 

filter settings, or amplifications without a problem. Any phase 

or sensitivity differences between the probes that may exist 

can also be compensated in this manner. 

Both the parameter multiplex as well as the probe multiplex 

can be used in two different types of operation: 

Fast multiplex operation 

This type of operation really goes at it like a round of simultaneous 

chess. After each data point is recorded, the operation 

switches to the next set of parameters and the next probe or 

coil. This enables an optimal testing speed to be achieved 

and all of the signals are recorded „practically simultaneously“. 

The recording rate of the channel per multiplex channel is 

naturally reduced by this so that testing cannot be carried out 

at the full testing speed of the channel. This type of operation 

is suited for tasks where a high amount of track coverage is 

required but the testing speed is not too high. The speed at 

which testing can be carried out primarily depends upon the 

number of probes or sets of parameters and the test frequencies 

being used. 

Slow multiplex operation 

Now imagine if the chess grandmaster would not switch to 

the next chessboard after each move but rather would spend 

a certain number of moves or a specified amount of time 

against each opponent. That is how the „slow multiplex“ type 

of operation functions. The multiplex rate decreases, but the 

full recording rate and bandwidth is available while the channel 

is active. This type of operation is used if multiple quickly 

rotating pieces are to be tested in rapid succession in multiple 

stations, for example. 

All of these types of operation can be combined in numerous 

ways. One test channel can test the lateral surfaces of a 

tool using multiple probes in fast multiplex while a second 

channel tests one side then the other side in long multiplex, 

for example. This enables optimal cycle times to be achieved 

at reasonable costs. 

Ask our experts to advise you on whether the innovative 

multiplex technology can be used for your testing problem 

as well. Then you will quickly be able to call „checkmate“ on 

your testing costs. 

Dr. Aschwin Gopalan, Rohmann GmbH 

11


Contact Information 

More addresses you will find on our homepage: www.rohmann.de 

GERMANY - Head office Agency in North-East Germany 


Carl-Benz-Str. 23 

67227 Frankenthal 

Germany 

Tel: +49 (0) 6233-3789-0 

Fax: + 49 (0) 6233-3789-77 

E-Mail: info@rohmann.de 

Internet: www.rohmann.de 

Gollub Werkstoffprüfung GmbH & Co. KG 

Viktor-Scheffel-Str. 8 

74177 Bad Friedrichshall 

Germany 

Tel: +49 (0) 7136 2 21 95 

Fax: +49 (0) 7136 2 21 97 

E-Mail: gollub-zfp@t-online.de 

Internet: 

www.gollub-werkstoffpruefung.de 

IC Escoffier 

Parc d‘activités 

de la Route des Lacs 

27106 Val de Reuil Cedex 

France 

Tel: +33 (2) 32 63 34 97 

Fax: +33 (2) 32 59 20 66 

E-Mail: jeanmichel.spinelli@areva.com 

Internet: www.intercontrole.com 

Jadeshine 

TYG Center B-1102 

Dong San Huan North Road Bing 2 

Chaoyang District 

100027 Beijing 

P.R. China 

Tel: +86 (10) 84 47 18 76 

Fax: +86 (10) 84 47 17 67 

E-Mail: jadeshine@263.net.cn 

Internet: www.jadeshine.com 

CNS UG (haftungsbeschränkt) 

Gartenstr. 28 

14548 Schwielowsee 

Germany 

Tel.: +49 (0) 33209 72533 

Fax: +49 (0) 33209 20924 

Mobil:+49 (0) 170 4859052 

e-mail: info@cns-ndt.de 

Agency in South Germany Sales office in North-West Germany 

Agency in FRANCE: 

Agency in CHINA: 

Agency in Great Britian: 

Rohmann (UK) Ltd 

Unit 6 Glenmore Business Park 

Bumpers Farm Industrial Estate 

Chippenham Wiltshire 

SN14 6BB 

United Kingdom 

Tel: +44 1249 65 93 46 

Fax: +44 1249 44 30 97 

E-Mail: sales@rohmann.co.uk 

Internet: www.rohmann.co.uk 

Tecnitest 

Calle Ciudad de Frias 1, 

Nave 4 

28021 Madrid 

Spanien 

Tel: +34 (91) 7 96 14 18 

Fax: +34 (91) 7 95 47 59 

E-Mail: rservent@tecnitest.com 

Internet: www.tecnitest.com 

Rohmann GmbH - Herr Schwabe 

Bohnenhof 24 

D- 53773 Hennef 

Germany 

Tel.: +49 (0) 2248-909 88 55 

Fax: +49 (0) 2248-909 88 56 

Mobil: +49 (0) 172-624 87 42 

E-Mail: info@rohmann.de 

Internet: www.rohmann.de 

Agency in ITALY: 

Ecomag srl. 

Via Pisa 250 

20099 Sesto San Giovanni 

Italy 

Tel: +39 (02) 24 41 67 75 

Fax: +39 (02) 24 30 82 60 

E-Mail: baroni@ecomagsrl.it 

Internet: www.ecomagsrl.it 

Agency in South KOREA: 

VASTEK 

201-506, Bucheon Technopark 

192, Yakdae-dong 

Wonmi-gu; Bucheon-si 

420-733 GYEONGGI-DO 

South Korea 

Tel: +82 32 3 28 90 20 

Fax: +82 32 3 28 76 64 

E-Mail: hajc7@yahoo.co.kr 

Internet: www.vastek.co.kr 

Agency in the USA: 

Rohmann LP 

111 Corporate Drive, Suite D 

Spartanburg, SC 29303 

USA 

Tel: +1 - 864 - 208 - 0480 

Fax: +1 - 864 - 208 - 0484 

E-Mail: info@rohmann.com 

Internet: www.rohmann.com 

Agency in SPAIN: Agency in SWITZERLAND: 

AMSLER Prüfsysteme (Schweiz) AG 

Herrgass 21 

8413 Neftenbach 

Schweiz 

Tel: +41 (52) 3 15 40 81 

Fax: +41 (52) 3 15 33 95 

E-Mail: aps.huggler@bluewin.ch 

Internet: www.amsler-pruefsysteme.ch 

Alle technischen Daten waren zum Zeitpunkt der Veröffentlichung korrekt. Rohmann GmbH behält sich Änderungen der Spezifikationen vor. 

Rohmann GmbH

Rohmann Newsletter 13 Eddy-Current-Test Instruments and Test ...

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