IEC 62765-1:2015

IEC 62765-1 ®
Edition 1.0 2015-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear powers plants – Instrumentation and control important to safety –
Management of ageing of sensors and transmitters –
Part 1: Pressure transmitters
Centrales nucléaires de puissance – Instrumentation et contrôle-commande
importants pour la sûreté – Gestion du vieillissement des capteurs et des
transmetteurs –
Partie 1: Transmetteurs de pression

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IEC 62765-1 ®
Edition 1.0 2015-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear powers plants – Instrumentation and control important to safety –

Management of ageing of sensors and transmitters –

Part 1: Pressure transmitters
Centrales nucléaires de puissance – Instrumentation et contrôle-commande

importants pour la sûreté – Gestion du vieillissement des capteurs et des

transmetteurs –
Partie 1: Transmetteurs de pression

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-2629-2

– 2 – IEC 62765-1:2015 © IEC 2015
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Abbreviations . 12
5 Background . 12
5.1 General . 12
5.2 Type of transmitter and interface. 12
5.2.1 Type of transmitters . 12
5.2.2 Interface between sensing part and process . 13
5.3 Reasons for transmitter ageing management . 13
5.4 Environmental stressors . 14
5.4.1 General . 14
5.4.2 Radiation . 14
5.4.3 Temperature . 15
5.4.4 Humidity . 15
5.4.5 Pressure transients . 15
5.4.6 Vibration . 15
5.4.7 Corrosive chemical reaction . 15
5.5 Sensing line problems to be considered with transmitter ageing . 16
5.6 Techniques for detecting pressure transmitter ageing . 16
6 Ageing management of transmitters . 17
6.1 General . 17
6.2 Methodology of ageing management . 17
6.3 Identification of ageing by performance verification test . 18
6.4 Test and inspection interval . 18
6.5 Test location . 19
6.6 Calibration of measurement and test equipment . 19
6.7 Test and inspection results . 19
6.8 Validation of test methods . 19
6.9 Classification of condition monitoring system and its software . 19
6.10 Replacement of transmitter or its parts . 19
7 Acceptable means for transmitter testing . 20
8 Relationship between initial qualification and transmitter ageing management . 20
Annex A (informative)  Calibration for type tests or periodic tests . 21
A.1 General . 21
A.2 Configuration for calibration of transmitters . 21
A.3 Uncertainty and TDF between M&TE and EUT . 21
A.4 Criteria for calibration tolerance . 22
A.4.1 As-found value and as-left value . 22
A.4.2 Allowable conditions for adjustment in calibration . 22
A.5 Calibration with adjustment . 22
Annex B (informative) Performance verification tests . 23
B.1 Test – Verification of performance . 23

B.2 Acceptable limits for test . 23
B.2.1 Linearity and accuracy . 23
B.2.2 Response time . 24
B.3 Alternative method with on-line calibration . 24
B.4 Remedial actions for inoperable transmitters . 25
B.5 Written procedure for calibration . 25
Bibliography . 27

Figure 1 – Conceptual methodology of ageing management . 18
Figure A.1 – Process and transmitter configuration for calibration . 21

Table 1 – Examples of ageing effects that can cause performance degradation in PTs . 14
Table 2 – Examples of environmental stressors with potential to damage transmitters . 16
Table B.1 – Consideration for verification of performance (see IEC 62385:2007,
Clauses 5 and 6) . 23
Table B.2 – Uncertainty of elements for Pressure transmitters (see IEC 61888:2002,
5.3.1) . 24
Table B.3 – Comparison between traditional and on-line tests of response time . 24
Table B.4 – Required actions followed by as-found value during calibration test as an
example . 25

– 4 – IEC 62765-1:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWERS PLANTS –
INSTRUMENTATION AND CONTROL
IMPORTANT TO SAFETY – MANAGEMENT
OF AGEING OF SENSORS AND TRANSMITTERS –

Part 1: Pressure transmitters
FOREWORD
1) Th
...