ISO 9934-3:2002

INTERNATIONAL ISO
STANDARD 9934-3
First edition
2002-07-15

Non-destructive testing — Magnetic
particle testing —
Part 3:
Equipment
Essais non destructifs — Magnétoscopie —
Partie 3: Équipement




Reference number
ISO 9934-3:2002(E)
©
ISO 2002

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ISO 9934-3:2002(E)
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ii © ISO 2002 – All rights reserved

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ISO 9934-3:2002(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted
by the technical committees are circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 9934 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 9934 was prepared by the European Committee for Standardization (CEN) in collaboration with Technical
Committee ISO/TC 135, Non-destructive testing, Subcommittee SC 2, Surface methods, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
Throughout the text of this document, read ".this European Standard." to mean ".this International Standard.".
ISO 9934 consists of the following parts, under the general title Non-destructive testing — Magnetic particle testing:
— Part 1: General principles
— Part 2: Detection media
— Part 3: Equipment
Annex ZZ provides a list of corresponding International and European Standards for which equivalents are not
given in the test.
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ISO 9934-3:2002(E)



Contents Page

Foreword.v
1 Scope .1

2 Normative references .1

3 Safety requirements .1

4 Types of devices .1
4.1 Portable electromagnets (AC) .1

4.2 Current generators .3
4.3 Magnetic benches.5

4.4 Specialized testing systems . 7
5 UV-A sources. 8

5.1 General . 8
5.2 Technical data . 8

5.3 Minimum requirements . 8

6 Detection media system. 9
6.1 General. 9

6.2 Technical data . 9
6.3 Minimum requirements . 9

7 Inspection booth . 9
7.1 General. 9

7.2 Technical data . 9
7.3 Minimum requirements .10

8 Demagnetization .10

8.1 General.10
8.2 Technical data .10

8.3 Minimum requirements .10
9 Measurements.10

9.1 General.10
9.2 Current measurement.11

9.3 Magnetic field measurement.11
9.4 Visible light measurement .11
9.5 UV-A irradiance measurement.12
9.6 Verification and calibration of instruments.12
Bibliography .13
Annex ZZ (normative) Corresponding International and European Standards for which equivalents
are not given in the text. 14
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ISO 9934-3:2002(E)


Foreword
This document (ISO 9934-3:2002) has been prepared by Technical Committee ISO/TC 135 "Non-destructive
testing" in collaboration with Technical Committee CEN/TC 138, "Non-destructive testing", the secretariat of which
is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by December 2002, and conflicting national standards shall be withdrawn at the latest
by December 2002.
This Standard consists of the following parts :
EN ISO 9934-1 Non destructive testing - Magnetic particle testing - Part 1 : General rules
prEN ISO 9934-2 Non destructive testing - Magnetic particle testing - Part 2 : Detection media
EN ISO 9934-3 Non destructive testing - Magnetic particle testing - Part 3 : Equipment
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,
Sweden, Switzerland and the United Kingdom.
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ISO 9934-3:2002(E)
1 Scope
This European Standard describes three types of equipment for magnetic particle testing :
 portable or transportable equipment ;
 fixed installations ;
 specialized testing systems for testing components on a continuous basis, comprising a series of processing
stations placed in sequence to form a process line.
Equipment for magnetizing, demagnetizing, illumination, metering and monitoring are also described.
This standard specifies the properties to be provided by the equipment supplier, minimum requirements for
application and the method of measuring certain parameters. Where appropriate, measuring and calibration
requirements and in-service checks are also specified.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 10084 Case hardening steels - Technical delivery conditions
EN ISO 3059:2001 Non-destructive testing - Penetrant testing and magnetic particle testing - Viewing conditions
(ISO 3059:2001)
EN ISO 9934-1:2001 Non-destructive testing - Magnetic particle testing - Part 1 : General rules (ISO 9934-1:2001)
EN 60529 Degrees of protection provides by enclosures (IP Code) (IEC 60529:1989)
3 Safety requirements
The equipment design shall take into account of all European, national and local regulations which include health,
safety, electrical and environmental requirements.
4 Types of devices
1)
4.1 Portable electromagnets (AC )
4.1.1 General
Hand-held portable electromagnets (yokes) produce a magnetic field between the two poles. (When testing
according to EN ISO 9934-1, DC electromagnets should only be used if agreed at enquiry and order stages).
Magnetization shall be determined by measuring the tangential field strength H at the centre of a line joining the
t
centres of the pole faces of the electromagnet with pole extenders where used. The electromagnet with a pole
spacing s is placed on a steel plate as shown in Figure 1. The plate shall have the dimensions (500 – 25) mm x
(250 – 13) mm x (10 – 0.5) mm and shall be of steel conforming to C 22 (EN 10084).

1) AC = alternative current, and DC = rectified current
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ISO 9934-3:2002(E)
Periodic functional checks may be carried out either by the method described above or by a lift test. The
electromagnet shall be capable of supporting a steel plate or rectangular bar conforming to C 22 (EN 10084) and
having a minimum mass of 4,5 kg, with the magnet poles set at their recommended spacing. The major dimension
of the plate or bar shall be greater than the pole spacing s of the electromagnet
NOTE : To lift a steel plate with a mass of 4,5 kg requires a lifting force of 44 N.
Dimensions in millimetres
Key
MP Measuring point for the tangential field strength
s Pole spacing
1 Poles
Figure 1 — Determination of the characteristics of portable electromagnets
4.1.2 Technical data
The following data shall be provided by the equipment supplier:
 recommended pole spacing (maximum and minimum pole spacing) (s , s );
max min
 cross sectional dimensions of the poles;
 electrical supply (voltage, current and frequency);
 current wave forms available;
 method of current control and effect on waveform (e.g. : thyristor);
 duty cycle at maximum output (ratio of current 'ON' to 'Total' time expressed as a percentage);
 maximum current 'ON' time;
 tangential field strength H at s and s (following 4.1);
t
max min
 overall dimensions of the equipment;
 equipment mass, in kilograms;
 specified electrical protection degree (IP) see EN 60529.
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ISO 9934-3:2002(E)
4.1.3 Minimum requirements
The following requirements shall be satisfied at an ambient temperature of 30 °C and at maximum output :
 duty cycle‡ 10 %
 current 'ON' time‡ 5 s
 surface temperature of handle£ 40 °C
‡ 2 kA/m (RMS)
 tangential field strength at s (see 4.1)
max
 lifting force‡ 44 N
4.1.4 Additional requirements
The electromagnet shall be supplied with a power ON/OFF switch preferably mounted on the handle.
Generally electromagnets should be usable with one hand.
4.2 Current generators
Current generators are used to supply current for magnetizing equipment. A current generator is characterized by
the open circuit voltage U , the short circuit current I and the rated current I (RMS-values).
0 k r
The rated current
...