SIST EN ISO 19397:2025

SLOVENSKI STANDARD
01-januar-2025
Nadomešča:
SIST-TS CEN ISO/TS 19397:2018
Barve in laki - Določanje debeline filma premazov z ultrazvokom (ISO 19397:2024)
Paints and varnishes - Determination of the film thickness of coatings using an ultrasonic
gauge (ISO 19397:2024)
Beschichtungsstoffe - Bestimmung der Schichtdicke von Beschichtungen mittels
Ultraschallmessung (ISO 19397:2024)
Peintures et vernis - Détermination de l’épaisseur du feuil de revêtements par mesurage
par ultrasons (ISO 19397:2024)
Ta slovenski standard je istoveten z: EN ISO 19397:2024
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19397
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2024
EUROPÄISCHE NORM
ICS 87.040 Supersedes CEN ISO/TS 19397:2018
English Version
Paints and varnishes - Determination of the film thickness
of coatings using an ultrasonic gauge (ISO 19397:2024)
Peintures et vernis - Détermination de l'épaisseur du Beschichtungsstoffe - Bestimmung der Schichtdicke
feuil de revêtements par mesurage par ultrasons (ISO von Beschichtungen mittels Ultraschallmessung (ISO
19397:2024) 19397:2024)
This European Standard was approved by CEN on 23 November 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19397:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19397:2024) has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes" in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the
secretariat of which is held by DIN.
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 May 2025, and conflicting national standards shall be
withdrawn at the latest by May 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes CEN ISO/TS 19397:2018.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 19397:2024 has been approved by CEN as EN ISO 19397:2024 without any modification.

International
Standard
ISO 19397
First edition
Paints and varnishes —
2024-11
Determination of the film thickness
of coatings using an ultrasonic gauge
Peintures et vernis — Détermination de l’épaisseur du feuil de
revêtements par mesurage par ultrasons
Reference number
ISO 19397:2024(en) © ISO 2024
ISO 19397:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 19397:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 4
5 Physical principles of the measuring method and of the application . 5
6 Apparatus and materials . 6
6.1 Ultrasonic film thickness measuring device .6
6.2 Couplant .7
6.3 Calibration standards .7
7 Calibration, adjustment and checking of the measuring device . 7
7.1 Calibration .7
7.2 Adjustment .7
7.3 Checking the adjustment .7
8 Procedure of measurement . 7
9 Temperature influence during the measurement . 8
10 Precision . 8
10.1 General .8
10.2 Repeatability limit .8
10.3 Reproducibility limit .9
11 Test report . 10
Annex A (informative) Quality of the personnel .11
Annex B (informative) Determination of precision .12
Bibliography .18

iii
ISO 19397:2024(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee
SC 9, General test methods for paints and varnishes, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This first edition cancels and replaces ISO/TS 19397:2015, which has been technically revised.
The main changes are as follows:
— an introduction has been added;
— the normative references have been updated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO 19397:2024(en)
Introduction
This document consistently enumerates the individual coatings applied in a multi-layer system by referring
to the first coating applied on the substrate as coating 1. Some other standards referring to individual test
methods enumerate in reverse order. See ISO 2808 for example.

v
International Standard ISO 19397:2024(en)
Paints and varnishes — Determination of the film thickness of
coatings using an ultrasonic gauge
1 Scope
This document specifies a method for determining the film thickness of coatings on metallic and non-
metallic substrates using an ultrasonic gauge.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 4618, Paints and varnishes — Vocabulary
ISO Guide 99, International vocabulary of metrology — Basic and general concepts and associated terms (VIM)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
ultrasonic wave
acoustic wave having a frequency higher than the audible range of the human ear, generally taken as higher
than 20 kHz
[SOURCE: ISO 5577:2017, 3.2.1]
3.2
longitudinal wave
compressional wave
wave in which the direction of displacement of particles is in the same direction as the propagation of the wave
[SOURCE: ISO 5577:2017, 3.3.1, modified — Note 1 to entry has been removed.]
3.3
echo
signal on the display of the ultrasonic instrument received from the test object
Note 1 to entry: See Figure 1 for an A-scan presentation (3.13) where the echo can be seen in the key, references 5 and 6.
Note 2 to entry: Depending on the test setup, additional echoes can be received.

ISO 19397:2024(en)
Key
1 straight-beam probe 5 back-wall echo
2 time base 6 reflector echo
3 reflector 7 A-scan presentation
4 transmitter pulse indication
Figure 1 — A-scan presentation
[SOURCE: ISO 5577:2017, 6.5.1 modified – Note 1 to entry has been amended.]
3.4
echo height
height of an echo (3.3) indication on the display
[SOURCE: ISO 5577:2017, 6.5.6]
3.5
ultrasonic impulse
short-lived ultrasound signal
3.6
ultrasonic sensor
ultrasonic probe
device for sending and receiving ultrasonic waves (3.1), mostly based on piezoelectric materials
3.7
acoustic impedance
Z
product of sound velocity and density of a material
3.8
reflection coefficient
ratio of reflected sound pressure to incident sound pressure at a reflecting surface
Note 1 to entry: For a wave, the reflection coefficient R is calculated from the acoustic impedances (3.7) Z and Z of the
1 2
bordering media, for which 1 is the medium of the incoming sound:

ISO 19397:2024(en)
ZZ−
R=
ZZ+
For a negative reflection coefficient, the phase (3.9) of the reflected signal is changed by 180°.
[SOURCE: ISO 5577:2017, 4.4.8, modified — Note 1 to entry has been replaced.]
3.9
phase
momentary condition of a vibration expressed as an arc measurement or an angle
[SOURCE: ISO 5577:2017, 3.2.3]
3.10
interface
boundary between two materials, in acoustic contact, having different acoustic properties
Note 1 to entry: See Figure 2.
Key
1 interface 6 angle of incidence
2 direction of incident wave 7 angle of reflection
3 direction of refracted wave 8 medium 1
4 direction of reflected wave 9 medium 2
5 angle of refraction
Figure 2 — Refraction and reflection of waves
[SOURCE: ISO 5577:2017, 4.4.1]
3.11
sound path travel time
time it takes for ultrasonic pulses to travel along the sound path travel distance
[SOURCE: ISO 5577:2017, 6.7.5]

ISO 19397:2024(en)
3.12
couplant
coupling medium
medium interposed between the probe and the test object to enable the passage of ultrasound between
them, such as water, glycerine or oil
[SOURCE: ISO 5577:2017, 6.3.3, modified — Note 1 to entry has been removed.]
3.13
A-scan presentation
display of the ultrasonic signals in which the X-axis represents the time and the Y-axis represents the
amplitude
Note 1 to entry: See Figure 1.
[SOURCE: ISO 5577:2017, 6.6.1]
3.14
calibration
operation that, under specified conditions, in a first step, establishes a relation between the quantity values
with measurement uncertainties provided by measurement standards and corresponding indications with
associated measurement uncertainties and, in a second step, uses this information to establish a relation for
obtaining a measurement result from an indication
Note 1 to entry: A calibration may be expressed by a statement, calibration function, calibration diagram, calibration
curve or calibration table. In some cases, it may consist of an additive or multiplicative correction of the indication
with associated measurement uncertainty.
Note 2 to entry: Calibration should not be confused with adjustment of a measuring system (3.15), often mistakenly
called “self-calibration”, nor with verification of calibration.
Note 3 to entry: Often, the first step alone in the above definition is perceived as being calibration.
[SOURCE: ISO/IEC Guide 99:2007, 2.39]
3.15
adjustment
adjustment of a measuring system
set of operations carried out on a measuring system so that it provides prescribed indications corresponding
to given values of a quantity to be measured
Note 1 to entry: Types of adjustment of a measuring system include zero adjustment of a measuring system, offset
adjustment and span adjustment (sometimes called “gain adjustment”).
Note 2 to entry: Adjustment of a measuring system should not be confused with calibration (3.14), which is a
prerequisite for adjustment.
Note 3 to entry: After adjustment of a measuring system, the measuring system should only be recalibrated if the
tolerance values specified for the gauge are no longer met.
[SOURCE: ISO/IEC Guide 99:200
...