IEC 61298-2:2008

Process measurement and control devices - General methods and procedures for evaluating performance - Part 2: Tests under reference conditions

IEC 61298-2:2008 specifies general methods and procedures for conducting tests and reporting on the functional and performance characteristics of process measurement and control devices. The tests are applicable to any such devices characterized by their own specific input and output variables, and by the specific relationship (transfer function) between the inputs and outputs, and include analogue and digital devices. For devices that require special tests, this standard should be used, together with any product specific standard specifying special tests. It covers tests made under reference conditions.

Dispositifs de mesure et de commande de processus - Méthodes et procédures générales d'évaluation des performances - Partie 2: Essais dans les conditions de référence

La CEI 61298-2:2008 spécifie les méthodes et procédures générales pour l'exécution des essais portant sur les caractéristiques fonctionnelles et les caractéristiques de performance des dispositifs de mesure et de commande de processus. Ces essais sont applicables à tout dispositif à condition que ce dispositif soit caractérisé par ses propres grandeurs d'entrée et de sortie et par la relation spécifique (fonction de transfert) entre les entrées et les sorties. Ils concernent les dispositifs analogiques et numériques. Pour les dispositifs nécessitant des essais spéciaux, il convient que cette norme soit utilisée en conjonction avec la norme particulière de produit spécifiant ces essais spéciaux. Elle couvre les essais effectués dans les conditions de référence.

General Information

• Status: Published
• Publication Date: 07-Oct-2008
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 25.040.40 - Industrial process measurement and control
• Technical Committee: SC 65B - Measurement and control devices
• Drafting Committee: WG 6 - TC 65/SC 65B/WG 6
• Current Stage: PPUB - Publication issued
• Start Date: 31-Oct-2008
• Completion Date: 08-Oct-2008

Standards Content (Sample)

IEC 61298-2
Edition 2.0 2008-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Process measurement and control devices – General methods and procedures
for evaluating performance –
Part 2: Tests under reference conditions

Dispositifs de mesure et de commande de processus – Méthodes et procédures
générales d'évaluation des performances –
Partie 2: Essais dans les conditions de référence

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IEC 61298-2
Edition 2.0 2008-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Process measurement and control devices – General methods and procedures
for evaluating performance –
Part 2: Tests under reference conditions

Dispositifs de mesure et de commande de processus – Méthodes et procédures
générales d'évaluation des performances –
Partie 2: Essais dans les conditions de référence

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 25.040.40 ISBN 978-2-88910-484-0
– 2 – 61298-2 © IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .7
4 Accuracy related factors .10
4.1 Test procedures and precautions .10
4.1.1 Selection of ranges for test.10
4.1.2 Preconditioning cycles.11
4.1.3 Number of measurement cycles and test points .11
4.1.4 Additional tests where digital inputs and outputs are provided .11
4.1.5 Measurement procedure .11
4.1.6 Processing of the measured values .12
4.1.7 Determination of accuracy related factors.12
4.1.8 Presentation of the results.16
4.2 Specific testing procedures and precautions for the determination of dead
band.16
4.2.1 Selection of ranges for test and preconditioning .16
4.2.2 Measurement procedure .16
4.2.3 Presentation of the results.17
5 Dynamic behaviour.17
5.1 General considerations.17
5.2 General testing procedures and precautions.17
5.3 Frequency response.17
5.4 Step response .18
6 Functional characteristic.18
6.1 General .18
6.2 Input resistance of an electrical device.18
6.3 Insulation of electrical devices.21
6.3.1 General considerations.21
6.3.2 Insulation resistance.21
6.3.3 Dielectric strength .22
6.4 Power consumption .22
6.4.1 Electrical power consumption .22
6.4.2 Air consumption.22
6.5 Output ripple of a device with an electrical d.c. output .23
6.6 Air flow characteristics of a pneumatic device .23
6.6.1 Initial setting up .23
6.6.2 Delivered flow Q .23
6.6.3 Exhausted flow Q .24
6.6.4 Data presentation .24
6.7 Limits of adjustments of lower range value and span.25
6.8 Switching differential .25
7 Drift .25
7.1 Start-up drift .25
7.2 Long-term drift.25

61298-2 © IEC:2008 – 3 –
Figure 1 – Error curves .15
Figure 2 – Two examples of frequency response .19
Figure 3 – Two examples of responses to a step input.20
Figure 4 – Test set-up for input resistance .21
Figure 5 – Test arrangement for measurement of airflow characteristics .23
Figure 6 – Typical air flow characteristics .24

Table 1 – Settings of span and lower range value adjustments .11
Table 2 – Number of measurement cycles and number and location of test points .12
Table 3 – Typical table of device errors .14
Table 4 – Dielectric strength test voltages .22

– 4 – 61298-2 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PROCESS MEASUREMENT AND CONTROL DEVICES –
GENERAL METHODS AND PROCEDURES
FOR EVALUATING PERFORMANCE –
Part 2: Tests under reference conditions

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